- Current Catalog
- Featured Articles Browse Issues
-
WU Zhilong, YANG Yong, DU Peilin, TANG Jianhong
2025(6):1-6
Abstract:
Aiming at the current problems that the selection of canal route schemes relies on experience and macroscopic demonstrations,this study takes the Pinglu Canal Project as an example and proposes a set of route comparison and selection methods based on quantitative analysis,aiming to enhance the scientificity of route selection and decision-making efficiency.Firstly,a comprehensive evaluation index system for route selection is constructed based on three major dimensions:technology,economy,and environment.It covers specific indicators such as route length,earthwork volume(engineering difficulty),quantity of land acquisition and demolition (coordination difficulty),and the impact on ecologically sensitive areas.The analytic hierarchy process (AHP) is used to determine the weights of each indicator.Secondly,taking the water divide section and the section of the Liuqin Expressway Bridge area of the waterway route as typical cases,the engineering costs and comprehensive benefits of different schemes are quantitatively compared and analyzed.The research shows that the proposed index system and the Analytic Hierarchy Process can significantly reduce the engineering economic cost and environmental impact.The comprehensive investment optimization ratio of the recommended scheme is more than 15% in the waterway route schemes of the water divide section and the bridge section area.The research method can provide a standardized comparison and selection framework for similar canal projects,and promote the transformation of route design from experience-driven to data-driven.Keywords：Pinglu canal;comparison factors;route plans;route-selection principles;analytic hierarchy process (AHP)
-
XU Keqin, WU Peng, YANG Shengfa, HU Jiang, LIAO Jianghua
2025(6):7-12
Abstract:
The Qingnian ship lock is the lowest cascade of the Pinglu Canal.After the construction of Pinglu Canal,the salt water intrudes from the Maowei Sea to the downstream approach channel of the Qingnian ship lock.The Qingnian ship lock is characterized by a salt-fresh water confluence water environment.With the operation of the Qingnian ship lock,salt water will intrude into Qingnian reservoir.Because of the unfavorable impacts of salt water intrusion,it is necessary to study the salt water intrusion at Qingnian reservoir which serves as the source of water for domestic drinking and agricultural irrigation of Qinzhou City.By constructing a three-dimensional numerical model of salt water intrusion of Qingnian reservoir,the effects of fresh water discharge and the salinity of the upstream approach channel of Qingnian ship lock on the distance of salt water intrusion and the vertical salinity distribution are studied.The results show that the salt water intrusion distance increases with the increase of water salinity at the upstream approach channel,showing a positive power relationship,and decreases with the increase of fresh water discharge,showing a negative power relationship.The vertical salinity gradient decreases with the increase of water salinity at the approach channel,showing a negative power relationship,and increases with the increase of fresh water discharge,showing a positive power relationship.
-
PENG Zuokang, ZHAO Binbin, ZHONG Xinfang, DENG Ying, ZHENG Bin
2025(6):13-22
Abstract:
In view of the problem that how to advance the construction of overseas strategic fulcrum ports in China in the new era,both theoretical and empirical research methods are employed to delve into connotations and significance of overseas strategic fulcrum ports,the implementation status of China’s overseas strategic fulcrum port projects,and existing challenges and problems.The conclusions are that the value of strategic fulcrum ports lies in fulfilling China’s strategic needs in global economic trade,international industrial cooperation,and ensuring resource and energy security.Positive progress has been made in practice,resulting in a series of strategic fulcrum ports with different value functions,such as Gwadar Port,Djibouti Port,Piraeus Port,and Hambantota Port,which have laid a foundation for the implementation of China’s overseas strategies.However,there are urgent issues to resolve,including significant impacts from geopolitics and great power competition,a limited number of ports under actual control and operation,inadequate integration between ports and industries and urban development,and limited application of Chinese standards.From a macro perspective of the port value chain,development strategies are proposed such as overall planning for the layout of strategic fulcrum ports based on the concept of “a maritime community with a shared future”,advancing the construction of overseas strategic pivot ports through port-industry integration or port-industry-city linkage models and innovative investment and financing implementation models,and strengthening the application of Chinese rules and standards in overseas ports.These strategies provide scientific justification and practical references for China’s planning and deployment of overseas strategic fulcrum ports construction.
-
XIA Yunqiang, GE Donglin, YANG Jia, ZHANG Yue, YAN Zhiduo
2025(6):23-29
Abstract:
To the problem of placement modes of accropode widely used at home and abroad,this paper compares and analyzes the relevant industry regulations at home and abroad,and finds that the foreign industry norms all stipulate the random placement mode,while the Chinese industry norms add the regular placement mode,specifically the queue-type regular placement mode.By using the wave cross-sectional physical model test,the stability test of three common placement modes is verified,and it is found that random placement mode has the best stability,followed by positive and negative regular placement mode,and queue-type regular placement mode has the worst stability.The current industry standards in our country use the KD value of the stability coefficient for accropode,which is not applicable to the queue type regular placement mode.Using this value will result in calculation results that are biased towards danger.
-
JIANG Fengyi, YI Qiaoqiao, HU Yu, PENG Shuhua
2025(6):30-34
Abstract:
By summarizing the development of low-carbon transformation in shipping vessels,waterways,and ports along the Yangtze River under the carbon peaking and carbon neutrality goals,this paper analyzes trends such as the slowdown in freight demand growth in Yangtze River shipping,the increase in new energy sources like LNG,the promotion of new energy applications such as LNG and lithium batteries in vessels,and the ongoing expansion of shore power technology and adjustment of energy structures in ports towards low-carbon development.It proposes measures to improve institutional mechanisms and carbon emission evaluation systems,promote the routine application of new energy sources,adjust energy use structures,build an integrated transportation system,and optimize transportation structures.The research results can lay the foundation for subsequent research on carbon emission monitoring methods in Yangtze River shipping and provide technical support and decision-making references in advancing the carbon peaking and carbon neutrality efforts in Yangtze River shipping.
-
ZHANG Tianxiang, WANG Guanyu, WU Lei, XIE Shugang, TU Jiahuang
2025(6):35-43
Abstract:
Floating breakwaters can provide effective protection for marine engineering equipment and meet the increasing protection needs of offshore facilities.Computational fluid dynamics method is used to numerically simulate the wave dissipation performance of floating breakwater with wing plates,and the influence of wing plate parameters on wave dissipation effect and vortex distribution of the breakwater is analyzed.The research results show that when the angle of the wing plate is too large the strength of the vortex generated at the tip of the wing plate becomes smaller,and the wave dissipation performance of the breakwater is reduced.When the wave height is large,the reduction of the wing plate angle makes the vortex shedding time longer,thus improving its wave dissipation performance.The shorter length of the wing plate accelerates the shedding of vortex,resulting in the reduction of its wave dissipation performance.
-
JING Yige, JI Zezhou, ZHANG Jinfeng, ZHANG Qinghe, PANG Qixiu
2025(6):44-54
Abstract:
The sedimentation issues near high-pile wharves are critical in port construction and maintenance.The group-piles beneath the wharf affect the surrounding tidal currents and sediment suspension,leading to sediment accumulation.Detailed modeling of pile foundations requires stringent grid scales and is not suitable for large-scale simulations involving numerous pile groups.This study employs a pile group generalization method to improve the FVCOM three-dimensional water-sediment model and validate it against sedimentation data at the Tianjin Port berth piles.Based on this,simulations considering and not considering pile group are conducted to analyze tidal currents,suspended sediment,and erosion-deposition evolution near the Tianjin Port berth.The simulation results show that the improved three-dimensional water-sediment model has good verification results.Considering effects of pile group creates a distinct flow obstruction zone under the wharf,affecting the distribution and velocity of surrounding flow.During flood tide,the sediment concentration in front of and below the dock is twice that of scenarios without pile group,while sediment concentration slightly decreases during ebb tide,with sediment mainly accumulating in front of the wharf.
-
2025(6):55-62
Abstract:
This article conducts in-depth research and analysis on water pollution and treatment in Nanshan Port,Sanya City.With the operation of Nanshan Port for many years and multiple pollutions,the water area of the port is facing increasingly serious water pollution problems.By conducting field investigations and water quality monitoring,the sources of pollutants are analyzed.The MIKE21 mathematical model is used to predict and analyze the diffusion of pollutants in seven different treatment schemes.Taking into account factors such as hydrodynamic conditions,pollutant treatment effectiveness,and economic viability,a comprehensive comparison is conducted from multiple aspects to select the relatively optimal marine water environment treatment plan.The research results can provide reference and guidance for water pollution control in port areas of similar regions.
-
2025(6):63-68
Abstract:
The structure of pile-supported pier is quite common in the construction of bridges,wharves,and other structures,and its construction is relatively difficult.The cost control of various measures is one of the factors that construction units consider first.On the basis of the project of 18# to 20# berths in Zhangwan working area of Sandu Bay area of Fuzhou Port,the original design scheme of the bottom formwork supporting structure of the substation platform for this project is optimized,and the construction organization is adjusted.The consumption of supporting steel is reduced when the bearing capacity of the support structure is ensured.Finally,the substation platform is successfully cast in the project and passed the acceptance,saving construction costs of 813,000 yuan.
-
2025(6):69-75
Abstract:
The inland river wharf projects in the middle and upper reaches of the Yangtze River have the characteristics of large water level difference and fast flow velocity.There are currently no operating LNG loading and unloading wharves neither at home nor abroad,and there is no relevant engineering experience for reference.Therefore,in order to promote the development of inland river LNG shipping,it is very necessary to carry out technical research on LNG loading and unloading wharves with large water level difference in inland rivers.This paper analyzes the layout and structural forms of existing coastal LNG(liquefied natural gas) wharves and inland river oil and gas chemical wharves,combined with the characteristics of LNG loading and unloading wharves with large water level difference in inland river.It proposes the plane layout of contiguous wharf and structure scheme of upright wharf with high pile frame,develops a detachable fast cable release hook and a laser rangefinder with automatic lifting guide rail.The appeal schemes that have been applied in practical engineering solve the key technical problems such as multi-boat combination,multi-layer mooring and auxiliary berthing in inland river under the condition of large water level difference,and can provide reference for similar projects.
-
2025(6):76-84
Abstract:
For the calculation of active earth pressure on the front wall of flexible sheet pile wharf,Coulomb earth pressure theory is adopted.Assuming that the active earth pressure on the front wall is generated by the sliding body of the soil behind the wall in the ultimate equilibrium state,a force balance differential equation is established for the horizontal differential elements taken by sliding soil along the wall height direction.Then the lateral earth pressure coefficient is solved by integrating the stress state of the micro soil elements on the deflection arch trace of the minor principal stress generated by the sliding trend of the sliding soil,and the theoretical formula for the distribution of earth pressure strength along the wall height of the flexible front wall is obtained by substituting the equilibrium differential equation.On this basis, the non-limit state soil mechanics parameters caused by the deflection of flexible wall of the sheet pile wharf are introduced to solve the earth pressure strength under non-limit state.The method proposed is basically consistent with the experimental results of mathematical models,and has certain reference significance.
-
SONG Xuepeng, SUN Ya, ZHU Yongying, SUI Yi, LI Yongqing, MA Ye, CHENG Zhixin, YOU Zaijin
2025(6):85-94
Abstract:
The high-pile wharfs of the main ports in the coastal areas of China are confronted with significant siltation issues,resulting in extensive damage to pile foundations and high maintenance costs.Based on the fact that the displacement of soft soil on silty bank slope is the main cause of silting in high pile wharf,the long-term monitoring of the displacement characteristics of soft soil on bank slope is carried out by using a combined measurement method involving stress sheets and flexible inclinometer.The study discusses the cumulative displacement of soft soil under loading at the rear of the wharf and examines changes in displacement rates of soft soil before and after dredging cycles.The results show that there will be settlement in the soil layer under the action of overloading,forcing the soil to move in the horizontal direction.It is observed that the lateral displacement of the coast gradually increases towards the seagoing side within one year,and the displacement rate is different before and after the dredging cycles of the wharf.Long-term monitoring of bank displacements is crucial for the management of coastal port project.Accurately analyzing the process can help reduce the risks caused by coastal erosion,landslides,and siltation problems of high-pile wharfs.
-
CHEN Ming, ZHANG Chao, JIANG Peng, HUANG Haijin, YIN Hangui
2025(6):95-103
Abstract:
Aiming at the problem of fish migration in Lize Shipping Hub of Jialing River， this paper proposes the design scheme of vertical slot fishway which is more widely used,and uses three-dimensional water flow mathematical model to compare and analyze the hydraulic characteristics of four fishway layout types(changing the width of the pool chamber,the width of the vertical slit,and changing the dimensions or angle of the bulkhead and guide plate).The results show that under the conditions of the pool chamber width of 3.0 m,vertical seam width of 0.5 m,the partition length of 2.1 m,the guide plate length of 0.7 m,and upstream slope of 77° and 45° for the partition and the guide plate,the curvature radius of the main flow in the pool chamber is larger,the strength of the reflux zones on both sides is weaker,the flow velocity is more stable after passing through the rest room,and the water flow connection is smoother.The water flow conditions in the pool room and rest room meet the upstream requirements of fish.The research results can provide reference for similar fishway projects.
-
LIU Tao, LEI Zewen, ZHU Boyuan, XIE Jingyu, CHENG Yongzhou
2025(6):104-113
Abstract:
In order to investigate the impact of sand excavation within Shimeitang and Chenjiazui mining areas on channel hydrodynamics of the lowest Lishui River and Songhu River,we adopt data of riverbed terrain and hydrology in 2021 and 2022 to build numerical model of planar 2D flow motion,and calculate hydrodynamics changes in the two channels for different hydrological conditions before sand excavation and after.The results show that the initial sand excavation scheme does not endanger Lishui channel and Songhu channel,but water level during dry season maximally declines by 0.16 m within the Lishui channel as the isolation beach of Shimeitang mining area entirely collapses after sand excavation,endangering the navigation safety.Among all optimized schemes,water-level drop within the Lishui channel decreases with mining-area contractions during dry season for the extreme situation of isolation beach collapse and water level no longer declines under the recommended scheme.However,the maximum water-level differences between the two channels reach 0.20 m and 0.30 m during water flood and recession stages,and the two mining areas produce a maximum flow velocity of 1.00 m/s on adjacent beaches and result in scour of beaches.During flood season,high flow velocities occur in mining areas and vicinities,and deposition may happen as sediment is carried into the shipping channels.Therefore,regular monitoring is advised to be implemented on riverbed of channels,and protection project is also needed to prevent beaches to collapse.
-
LI Rui, ZHANG Wen, YANG Shengfa, GAN Binrui, WU Jingang
2025(6):114-121
Abstract:
Many tributaries are distributed along the Pinglu Canal,and the aggradation of the sediment transported from them in the canal affects the canal construction and navigation safety.Xinpingshui is an important target in tributary-sediment-control efforts of the Pinglu Canal.For clarifying the sediment transport pattern of Xinpingshui,the flow-sediment transport characteristics in this tributary for different hydrological regimes are investigated on the basis of in-situ monitoring and theoretical analysis.Measured data are applied to propose an empirical prediction method for the sediment transport rate of Xinpingshui flow.The results show that every cross-section of Xinpingshui exhibits a wide and shallow U-shape,with sediment particles of riverbed displaying a pattern of coarsening followed by fining along the river.Without rainfall,the sediment transport capacity in each reach of Xinpingshui is greater than the measured sediment transport rate in both dry and flood seasons,indicating the flow may scour the riverbed and transport sediment to the canal.During the flood season,rainfall can significantly increase the flow sediment content near the confluence of Xinpingshui,resulting in the measured sediment transport rate exceeds the sediment transport capacity,which may cause riverbed aggradation here.The sediment transport rate of Xinpingshui flow is positively correlated with discharge.
-
WANG Xiaoyan, LI Changling, LI Dong, PAN Meiyuan, RUAN Rongtao
2025(6):122-127
Abstract:
To implement the important directive spirit of the Yangtze River Economic Belt to “jointly protect and not engage in large-scale development”,this paper explores the ecological comprehensive utilization of dredged waste soil in the waterway regulation project of Wuhan-Anqing section of the Yangtze River trunk line,adopts eco-friendly structure and green construction technologies to construct ecological beach projects,reduces the impact of dredging on ecological environment,promotes the restoration of vegetation on the beach,and enhance the ecological function of the beach.The ecological beach consolidation project mainly includes three parts:embankment,filling of dredged soil inside the embankment,road laying,and ecological beach protection.After the implementation of the Daijiazhou ecological beach consolidation project,the beach has become stable,forming a good ecological greening effect,achieving the coordination and unity of ecology and beach consolidation,and achieving the construction goals of the project,and the regulation effect is good.
-
WANG Qinzhen, DONG Xia, FAN Hongxia
2025(6):128-135
Abstract:
Huai’an east ship lock in the Huaihe River estuary waterway is surrounded by numerous waterways,water conservancy and transportation facilities,making the construction and operation environment extremely complex.According to the navigation conditions,impact on the flood discharge of the Huaihe River estuary,impact on the navigation of the Beijing-Hangzhou Canal,impact on surrounding buildings,external transportation conditions,and land acquisition and demolition situation,it is recommended to choose a scheme of the southern ship lock position.At the southern ship lock position,according to the navigation conditions,capacity,efficiency,impact on the flood discharge of the Huaihe River estuary,impact on the flood control embankment,construction conditions,and project investment,a curved in and straight out layout plan is recommended.After conducting overall physical model tests on the ship lock,it is demonstrated that overall layout plan is reasonable.Layout plans for upstream and downstream navigation adjustment sections and berthing sections meet requirements of navigation water flow conditions specified in the code.After optimizing the length and permeability of the upstream and downstream side flow barriers,dredging of the local water area in front of Yundong sluice gate is carried out,and compensation engineering measures are taken for the cut-off of floodwaters in the Huaihe River estuary,which can meet the requirements of the ship lock’s own navigation water flow conditions.The construction of the project will not have any adverse effects on the flood discharge of the main irrigation canal in northern Jiangsu Province,the operation of the Yundong sluice,the operation of the aqueduct,and the power generation of the Yundong power station.It will have little impact on the flood discharge of the Huaihe River estuary and the operation of the culvert.
-
2025(6):136-143
Abstract:
Bailongtan hydropower station is located in a sharp bend channel,surrounded by dense buildings.Restricted by various factors such as river regime,terrain and surrounding buildings,the general layout conditions for ship lock renovation and expansion are complex.Multiple schemes are compared for the lock position and general layout from several aspects,including navigation conditions,impact on surrounding buildings,construction conditions and investment,to determine the optimal general layout scheme.Combined with the physical model tests,the layout scheme of reducing the bending radius of the channel and zigzag layout of berthing section is adopted to solve the problem of limited space for approach channel.Through engineering measures such as adding groyne,installing permeable walls and excavating partial channel,the navigation conditions of upstream and downstream entrance areas are effectively improved,providing reference for the ship lock renovation and expansion in curved channel and narrow spaces.
-
2025(6):144-152
Abstract:
The second-line ship lock of Longtoushan hub is located in a slightly curved river section,and the downstream is affected by Longtoushan rock head,resulting in complex overall water flow conditions.The position of the ship lock is determined to be arranged by comparing advantages and disadvantages of the layout near the first-line ship lock and the layout near Gandong levee.The distance between the axis of the second-line ship lock and the axis of the first-line ship lock is determined by analyzing the cross-section of the lower ship lock head.Corresponding optimization measures are proposed by the physical model test.The results show that the position of the second-line ship lock is arranged near the first-line ship lock,and the distance between the axis of the second-line ship lock and the axis of the first-line ship lock is 100 m.Measures of the reconstruction and expansion of upstream and downstream baffle walls,as well as the dredging of the right bank beach downstream,can improve navigable conditions of the first-line ship lock and optimize the planar layout of the second-line ship lock.
-
XIONG Xianhua, JI Wenyuan, SHEN Qiuren
2025(6):153-157
Abstract:
When the plane valve of the water delivery system of a III-class ship lock is closed,the blockage occurs,resulting in the breakage of the boom.In this paper,dynamic principle and finite element method are used to analyze the causes of buckling failure of valve boom.Under the condition of water delivery valve blockage,the valve,boom and headstock gear form a planar four-link mechanism,which is easy to cause buckling failure of the boom under pressure at the collinear dead point.Through the calculation of linear buckling characteristic values and nonlinear post-buckling analysis,it is concluded that the critical buckling load of the boom is 80 kN,which is lower than the overpressure alarm value of the hydraulic headstock gear.The buckling mode shows that large deformation occurs after the boom is destabilized under pressure,resulting in plastic deformation and fracture of local materials after yielding,which makes the boom break.The critical buckling load of the boom is more sensitive to the material plate thickness of the hinged single lug plate.Increasing the plate thickness or using double lug plate structure can significantly improve the ability of the structure to resist buckling instability.The research results can provide reference for similar structural design.
-
LIU Zhenjia, REN Bohao, LIANG Kai, WANG Xuerong, LI Mingwei
2025(6):158-166
Abstract:
To clarify the occurrence law of different types of typical obstructive flow patterns,and predict the typical obstructive flow patterns that may occur in the future based on the known objective conditions,this study focuses on summarizing and sorting out the characteristics of different flow patterns and carries out the research on the prediction method for the surface flow pattern characteristics of sharp bends channels to address the safety risks of navigation caused by obstructive flow patterns.The prediction method based on CNN-GRU-BP combined neural network is used,and compared with the measured values and traditional numerical methods.The results show that the combined network prediction method has good prediction performance for the surface flow characteristics of the channel,and it can obtain the characteristic values of different flow patterns in real time,accurately,and purposely under the input nonlinear influencing factors,which can provide data support for the navigation safety control of the actual channel,and technical support for the prevention and resolution of related navigation safety risks.
-
2025(6):167-176
Abstract:
With the development of smart waterway construction,flow velocity monitoring plays an important role in the accurate acquisition and real-time management of hydrological information.In response to the relative lack of research on flow velocity monitoring in complex water environments,an array radar flow measurement system is proposed and adopt.The array radar flow measurement experiment is conducted on-site in a certain water area of the Yangtze River to verify its monitoring effectiveness under complex water conditions.The system utilizes P-band radar and utilizes line array digital beam-forming technology and Bragg scattering principle to achieve non-contact real-time monitoring of water flow velocity.Fuzzy clustering algorithm is used to screen the Doppler characteristics of each waterway,and the data are compared with acoustic Doppler current profiler(ADCP) synchronous flow measurement data.The results show that the array radar flow measurement system has excellent flow measurement performance in complex water environments,providing an efficient and reliable technical means for flow velocity monitoring in the context of smart navigation.After removing the adverse effects of ship upward movement,the accuracy of radar wave surface flow field data is high,and the overall deviation of flow velocity obtained based on radar waves at experimental observation points is not greater than 7.00%,comparing with the ADCP synchronous flow measurement data.
-
WEN Chengyong, YING Zongquan, LIN Meihong
2025(6):177-185
Abstract:
In view of the engineering problem of port construction in the area with poor geological condition,poor or even bad sea condition,the object-oriented method is adopted to extract the knowledge of construction entities and establish the construction knowledge graph system of pile-supported wharf.The key information of construction knowledge of pile-supported wharf is represented by triplet,and the knowledge fusion is carried out according to three levels of knowledge graphs of prefabricated component,construction process and quality control requirements by the entity alignment method of graph convolutional network.The construction factor similarity calculation method is used to calculate the Levenshtein distance between the target data and the typical process condition data in the knowledge graph under specific engineering conditions,and the overall construction process flow is determined.The constraint rule decision tree is used to impose constraints on the construction body in terms of production resources,technical standards,safety risks and comprehensive evaluation,and key construction parameters in the specific process are clarified,then the logical route of construction technology is optimized.The Unreal Engine is used to create the offshore construction inference system of pile-supported wharf,and the intelligent planning of pile driving process and the intelligent decision of pile stopping condition under different construction conditions are realized by designing blueprint script.
-
ZHANG Yunfei, SU Zhen, WANG Wei
2025(6):186-193
Abstract:
In view of the problem that current loading control processes of a trailing suction hopper dredger is high personnel dependence and low efficiency,prioritized experience replay (PER) and random network distillation (RND) are combined,and a reinforcement learning control algorithm is proposed on the basis of priority replay and random network distillation soft actor-critic (PRND-SAC).By designing appropriate state space,action space,and reward function,the PRND-SAC controller is compared with the traditional SAC controller.Furthermore,comparative experiments are conducted between the PRND-SAC controller and actual operational data on the basis of a full-process loading phase simulation environment.The results demonstrate that the proposed controller converges quickly and stably.Furthermore,compared to the traditional SAC controller,the PRND-SAC controller not only enhances the stability of the control process but also significantly increases loading efficiency.
-
WANG Yifei, WANG Chengzhi, ZHAO Sanglan, CHEN Donghong
2025(6):194-202
Abstract:
In order to solve problems that traditional contact-based sensing instruments are interference with berthing operations and maintenance difficulties while measuring berthing loads on ships,and non-contact methods of laser rangefinders and sonar sensors are affected by lighting and environmental conditions,we propose a method for load sensing during coastal berthing on the basis of digital image measurement.Relying on a wharf project at Ningbo-Zhoushan Port in Zhejiang Province,we use the method to compute the deformation displacement of rubber fenders by analyzing speckle patterns in two images taken before and after deformation.By leveraging the known specifications of the rubber fender and the deformation displacement data,we calculate the impact energy and fender reaction force,allowing for the estimation of berthing loads.The results of field tests demonstrate that compared to conventional strain gauge measurements,the error margin of this method is less than 10%,validating its effectiveness in sensing berthing loads through on-site application.
-
TIAN Yibo, LIU Zhenjia, LIANG Kai, REN Bohao, HAN Yue, LI Mingwei
2025(6):203-210
Abstract:
The riverbed terrain of the Shipai bend between the two dams of the Three Gorges and Gezhouba Water Conservancy Hub on the Yangtze River is complex,with significant changes in flow rate and a wide distribution of surface obstruction flow patterns,posing safety hazards to the navigation of ships.However,the existing problems of flow field measurement technology are limited measurement range,significant environmental impact,and insufficient real-time performance,which cannot meet the needs of complex channel surface flow field measurement.In response to the above issues,this article conducts research on real time twin method for surface flow fields.LSPIV technology combined with multi view cameras is used to construct a real-time twinning system for surface flow fields in sharp curved waterway environments.And on-site comparative tests are conducted in the curved water area of Shipai,obtaining twin data of the flow field in the surface water area.The results show that this method can accurately and real-time restore the actual water flow state on the surface of the waterway,and has a good agreement with the measurement values of the unmanned aerial vehicle radar speed measurement equipment,providing technical support for the safety of hub navigation.
-
CHEN Zhifeng, WU Guoxin, LIAO Chenyan, BEI Jianzhong
2025(6):211-216
Abstract:
There is a large amount of coral soil in Tanzania,and the C value of California bearing ratio as well as the compaction degree can reach more than 80% and 98% respectively,but it is easy to soften after encountering water,and the C values quickly decreases to about 30%.Based on a renovation and expansion project,aiming at the problems of coral soil with high dry strength and softening in contact with water,this paper optimizes the original design of interlock block pavement structure,adopting the coral soil as the base (base) material instead of the traditional cement stabilized or granular base (base) material,and proposes the design of the sole-covered sub-base of pavement structure with Tanzania coral soil,makes checking and analysis based on the finite element calculation theory together with laboratory test research and field typical construction research.The results show that the C values of sole-covered sub-base are most between 70% and 85%,which effectively improves the water stability of coral soil,and the internal force of the concrete slab is less than the tensile strength and shear strength of the designed C28/35 concrete surface layer,which meets the application requirements,and greatly reduces the project cost.The research results can provide reference for similar projects.
-
2025(6):217-222
Abstract:
Taking the 800 mm PHC pile supported by the stratum of hard clay with sand as the research object,the influence of soil resistance calculation method,soil recovery coefficient and block coefficient of pile end on pile sinking penetration is studied by using GRLWEAP piling analysis software.According to the analysis results,the long-term static resistance of soil can be calculated according to the API specification of the United States.For the clay stratum with less than 30 penetration blow numbers,the recovery coefficient is 1.5-2.0,for the clay stratum with more than 30 penetration blow numbers,the recovery coefficient is 1.0,and for the medium to dense sand stratum,the recovery coefficient is 1.20-1.12.The block coefficient of pile end ranges from 0.5 to 1.0 according to the depth of pile foundation entering the bearing stratum.The penetration calculated by this method is close to the actual pile sinking record,and the relevant calculation parameters and analysis results can provide reference for similar projects.
-
XU Wenji, KONG Lei, YANG We, WANG Dunge, CHENG Yongzhou
2025(6):223-229
Abstract:
To provide dry construction conditions for the main project of Xiaoxiang Ship lock,a transverse cofferdam needs to be filled in the upstream to form a main pit construction cofferdam with Songjiazhou on the right bank and Xiaoxiang West Road,which involves seepage and anti-seepage analysis of the combined cofferdams.The connection between the transverse cofferdam upstream and the longitudinal cofferdam on Songjiazhou is susceptible to the impacts of the groundwater seepage caused by the main stream of Xiangjiang River on the north-east side of Songjiazhou.The seepage problem in this project involves mostly saturated-unsaturated soils,and the seepage of water in saturated-unsaturated soils needs to be considered comprehensively.Based on the saturated-unsaturated theory,this paper uses GeoStudio software to model the upstream lateral cofferdam and the combined cofferdam on the right bank of Songjiazhou in three dimensions with regard to the structural form and rock distribution characteristics of the cofferdam of the Xiaoxiang Ship Lock Project.The numerical simulation results are analyzed for seepage and anti-seepage analyses from the perspectives of pore water pressure,water head,and seepage vector.
-
XUE Wei, WANG Jianxiong, WANG Lu, WANG Changyong
2025(6):230-236
Abstract:
To explore the application effect of UAV LiDAR in beach topography measurement in the Yangtze Estuary waters,UAV LiDAR field measurements are carried out in different areas of the Yangtze Estuary waters on the basis of exploring the principle of UAV LiDAR measurement.Through data calculation and comparative analysis,it is found that the measured data are greatly affected by the vegetation cover of the mudflat,which makes it difficult to read the mudline of the mud flat.Selecting colder seasons such as autumn and winter to carry out UAV LiDAR measurements is conducive to improving the accuracy of the data,while some areas covered with good perennial vegetation are recommended to be measured by multiple flights to improve the effective data volume.In addition,when carrying out UAV LiDAR data measurements,it is necessary to synchronize traditional means such as GNSS-RTK measurements to verify the accuracy of the data,and the combination of UAV photographic data is conducive to the discrimination of various types of feature elements.
-
MIAO Chenhui, ZHAO Dongdong, JIANG Biao
2025(6):237-242
Abstract:
：In high pile projects with prefabricated beam and slab structures,if prefabricated components cannot be hoisted by crane ships due to environmental limitations,a temporary bridge with a wide bridge deck and high load-bearing capacity needs to be built,and large crawler cranes need to be used for components hoisting.However,the high standard design of the temporary bridge will lead to a significant increase in construction costs,resulting in project losses.A walking type hoisting machine and supporting hoisting technology are developed around the idea of the hoisting machine walking at different elevations and operating sequentially in different zones,and the techology can achieve full range hoisting of prefabricated components.The hoisting machine can walk on pile caps,avoiding the problem of building high standard temporary bridge.The hoisting technology is applied in engineering practice,and it has advantages of safety,efficiency,economy,and environmental protection.
2025 Issue 6
The New Western Land-sea Corridor:Pinglu Canal Project Construction Column
Comprehensive
Port
Waterway and Navigation Strucure
Information Technology
Ground and Foundation
Construction
-
LIU Xiaobin, WU Xiaolei, WU Peng
2025(2):1-8
Abstract:
The Canal Economic Zone represents an economic form that tightly integrates shipping economy with regional economy,serving as a significant measure to provide shipping support for the country’s new development pattern of “dual circulation”.Addressing issues such as unclear definition of the Canal Economic Zone,insufficient theoretical foundation,unclear operational logic,and unsystematic overall understanding,this article proposes the connotative characteristics of the Canal Economic Zone and a canal-oriented economic zone system.By employing interdisciplinary research,qualitative analysis,and case study methods,it concludes that the core content of Canal Economic Zone planning is to comprehensively develop the regions along the canal,develop canal-related industrial systems,organize production factors around the canal,and guide the agglomeration of urban and rural populations,ultimately forming a banded territorial spatial layout.The research results show that Canal Economic Zone planning should focus on six key aspects:core industries,banded space,open mechanisms,green development,county economy,and government-enterprise cooperation,to establish a canal-oriented productivity organization and territorial spatial layout model.
-
CHENG Lixing, GU Yong, LIANG Xin, HAO Yuchi
2025(2):184-190
Abstract:
Scour protection is one of the important issues that need to be faced in the design and maintenance of dock pile foundations.This article explores the feasibility of using solidified soil for pile foundation erosion protection,that is,using engineering construction soil to add suitable solidification agents to form solidified soil,covering the scouring area of bridge piers in an appropriate way,enhancing the anti erosion performance of the bed surface,and thus playing a protective role.This article conducted targeted physical model experiments and numerical simulations on the flowability,shear strength,and erosion resistance of different solidified soil formulations.The experimental results show that the collapse diameter of solidified soil increases with the increase of soil to water ratio,and the fluidity of solidified soil decreases rapidly with time.The shear strength of solidified soil slowly increases over time,and as the ash to soil ratio increases,the strength of solidified soil will also increase accordingly.The overall resistance of solidified soil to water flow erosion is good,and it can be used as a new type of erosion protection material.In underwater environments,the strength of solidified soil also increases over time,and its durability is good.
-
XIE Libo, SU Lei, WANG Jianfeng, WANG Yuanxin, BI Jianwei, LING Xianzhang
2025(2):27-35
Abstract:
Wave is the main environmental load for pile-supported wharf (PSW) in deep water area.Investigating the dynamic response characteristics of PSW-seabed system under wave action is the basis of dynamic design for deep water port.In this paper,a 3D finite element model of wave-PSW-seabed is established by ADINA.Pore water pressure and acceleration of seabed around pile,deck displacement,as well as dynamic water pressure time history of pile shaft under wave action are obtained.The dynamic response characteristics of the PSW-seabed system are analyzed,and the influence of the changing wave period on the dynamic response of this system is discussed.The numerical simulation results show that:1) there is no cumulative effect on pore pressure around pile under wave action;2) Dynamic water pressure of middle pile is significantly greater than that of the side pile;3) Amplitudes of seabed pore pressure,seabed acceleration,and dynamic water pressure attenuate along the wave propagation,and the smaller wave period,the more significant the attenuation effect.The modeling technique involved in this study can provide reference for similar PSW numerical simulation under wave action,and the investigation results can provide support for dynamic design of PSW-seabed system.
-
2025(2):164-171
Abstract:
After the 175 m water storage operation of the Three Gorges project,the scale of Jiulongpo to Chaotianmen reach cannot meet planning requirements.During the sedimentation period,the sediment is washed up and down,and the erosion is not timely,causing shallow navigation obstruction in the channel.The channel regulation of this reach is carried out from 2016 to 2020 to improve the channel scale of the engineering reach and curb the adverse development of channel conditions.After the completion of the project,the improvement effect is analyzed through regular observation.The results show that the river regime in the engineering reach is stable,the scale of the channel is significantly improved,and the unfavorable development trend is curbed,resulting in effective improvement of the channel conditions,achieving the goal of channel regulation.
-
SU Shiding, XU Xiong, ZHANG Bo, LYU Shuhui
2025(2):197-202
Abstract:
Coral reef sand,due to its special engineering properties such as fragility and high compressibility,differs from conventional sand.During impact pile driving,the process can easily cause complex changes in coral reef sand particles,such as breakage and shear,leading to pile running.Unanticipated pile running,especially over long distances,not only increases the difficulty of pile driving control but also poses high construction risks.Therefore,there is an urgent need for an analysis method to predict the depth of pile running in deep coral sand formations to guide pile driving control and reduce construction risks.In this paper,high strain pile tests are conducted in deep coral reef sand formations based on actual engineering scenarios.The analysis of soil resistance values in pile running conditions in coral reef sand is carried out,and a method for predicting the distance of pile running in coral reef sand formations is proposed.Furthermore,the pile driving control method that considers the risk reduction of pile running is proposed,and it is applied to 602 driven piles on-site for risk prediction of pile running and pile driving control,and the laws of pile diving in coral reef sand stratum are summarized.
-
LIU Lu, SHI Youren, LU Xiaodong, CAO Huijiang
2025(2):157-163
Abstract:
The riverway conditions of the Huangpu River are complicated with many river bends,while Lujiazui Bend owns the largest curvature together with the smallest turning radius of the waterway among all the river bends of Huangpu River.With the rapid growth of the number of navigable ships in the Huangpu River,the silting of the beach near the convex bank of the Lujiazui Bend has a certain influence on the safe navigation of passing ships in recent years.Viewing platforms,regarded as urban reception halls of Shanghai,are set along Luijiazui Bend.Adverse impacts will be resulted from safety incidents in case.Therefore,we analyze the hydrological and sediment characteristics of Lujiazui Bend of Huangpu River,and historical changes of river regime as well as navigation characteristics of ships and surrounding restrictions,and propose the waterway layout and regulation measures in Lujiazui.The results show that cutting and widening the convex bank shoals on the east side of Lujiazui can slove the narrow problem of navigable waters of the bend,and improve the bend navigation environment for ships.
-
XIE Yuxuan, WANG Guangsheng, YU Tong, GUAN Dawei
2025(2):17-26
Abstract:
The modern coastal protection systems place higher demands on the crest elevation and permeable of breakwaters.A three-dimensional numerical wave flume based on the Reynolds-averaged Navier-Stokes equations is established to investigate the wave force of submerged perforated semi-circular breakwaters under the action of shallow water waves.The results indicate that there is a phase difference between the horizontal and vertical forces acting on the submerged semi-circular breakwater,with the critical sliding moment generally corresponding to the moment of maximum shoreward horizontal force.As the perforation rate increases from 0% to 25%,the dimensionless maximum shoreward and seaward horizontal forces on the submerged semi-circular breakwater decrease by 27.8% and 39.8%,respectively.With decreasing wave period and increasing submergence depth,the seaward sliding force on the submerged semi-circular breakwater increases.Empirical formulas provide conservative estimates for the total force on unperforated semi-circular breakwaters under long-period waves and extreme submergence conditions,and further overestimate the wave forces on submerged perforated semi-circular breakwaters.
-
FU Xuhui, GONG Huiling, HE Jinglin, TANG Rongling, ZHANG Bo
2025(2):110-118
Abstract:
In recent years,with the rapid development of shipping economy,waterway regulation projects are frequent in the Yangtze River basin.Although waterway regulation projects can improve flow conditions,they also have a certain impact on fish habitat.To explore the impact of different waterway regulation projects on fish habitat,we take Luoqi Reach of the upper reaches of the Yangtze River as an example,and use numerical simulation method to compare and analyze the changes of habitat suitability of Four Major Chinese Carps before and after the waterway regulation project from the perspective of ecology and hydraulics.The results show that after the waterway regulation project,the very suitable area ratio of fish habitat increases by 1.21% at most,and the unsuitable area ratio decreases by 1.85% at most.Moreover,with the increase of water level and flow,the sub channel upstream of Luoqi will produce a suitable habitat environment for survival.
-
LIU Mingwei, ZHANG Siqi, WU Linjian, LI Huijiuyuan, DI Yutao, DAI Chuan
2025(2):51-62
Abstract:
To ensure the long-term operational safety of frame-structure vertical wharfs in inland waterways,it is crucial to conduct monitoring and inspection of their service performance.The placement and scheme of monitoring sensors directly affect the accuracy and reliability of monitoring results.Therefore,sensors should ideally be positioned within the structural load sensitive areas.However,due to the complexity of frame-structure vertical wharfs and the large number of load combinations,the locations and distributions of structural load sensitive areas under the most adverse load combinations remain unclear.To address this issue,this study,based on a large inland hub port,establishes a three-dimensional numerical simulation model of a frame-structure vertical wharf segment.By developing an algorithm to identify the most adverse load combinations for critical structural components,the most adverse load combinations for each component are determined.On this basis,the distribution patterns of load response points and the ranges of sensitive areas under the most adverse load combinations are identified by using finite element numerical simulation.The results indicate that under complex load combinations,steel components of frame-structure vertical wharfs exhibit greater load sensitivity compared to concrete components.The sensitive areas of steel components are primarily located at the junctions of high and low water levels and the cantilever ends of the front-row steel mooring structures.This study addresses issues such as redundancy and ineffectiveness in monitoring point placement,providing a theoretical basis for the deployment of monitoring sensors in inland hub port wharfs.
-
LIU Zuofei, ZHU Binhua, FAN Shugang
2025(2):172-177
Abstract:
Research and practice on maintenance and dredging engineering are conducted to address the navigation obstacles faced by the Xiaziliang shoal section of the Three Gorges Reservoir’s variable backwater area during dry season,such as bends,narrowness,rapidity,and danger.It is found that the overall trend of this beach section is slow and continuous sedimentation by collecting a large amount of historical measured data and comparing and analyzing the changes in isobaths and erosion and sedimentation over the years.On the basis of the waterway conditions and water characteristics of this river section,the construction equipment and the water level are compared,and a reasonable maintenance and dredging plan is formulated.Implementation results of the project indicate that the maintenance and dredging project can improve the conditions of the waterway,expand navigable waters,and reduce the difficulty of ship operation,thereby ensuring the smoothness and safety of the waterway.
-
ZHOU Jingxiang, PAN Haitao, CHEN Yongjian, YAN Qiang, WANG Yulong, WANG Chaoliang, ZHANG Zhisen, WANG Shuai
2025(2):9-16
Abstract:
Pinglu Canal is the key project of the Western Land-Sea New Corridor,and building an efficient,intelligent,green,and resilient canal is an important component of the construction of Pinglu Canal with high standard and high-quality.By planning the overall architecture of the smart canal and combining the characteristics and needs of the construction and operation management of Pinglu Canal,the smart construction and management system is proposed as a typical application scenario including “full process integration and coordination of construction and management,full cycle digital twin of progress management,full process simulation and regulation of quality management,all-around early warning and prevention of safety management,and full-link monitoring and early warning of green management”,as well as the typical application scenarios of the smart operation system,including “one-net efficient coordination of operation management,one-body seamless coordination and linkage of operation and dispatch,one-map scientific and intelligent management of locks and maintenance,one-click coordinated and connected emergency response,and one-station efficient and convenient logistics services”.Furthermore,we summarize the innovative technical features of the digital twin Pinglu Canal from five aspects of “full-factorial three-dimensional perception,full-process digital twin,full-process simulation and simulation,all-around intelligent services,and full-technology self-developed and controllable”,which can provide reference for the construction of similar smart port and navigation projects.
-
LIU Meimei, YING Zongquan, LI Jiamin, ZHAO Juan, LIANG Zihao
2025(2):45-50
Abstract:
To accurately evaluate the bending capacity of corroded reinforced concrete beam,we take three corroded reinforced concrete beams of prototype members as research objects,carry out the bearing capacity test and simulation analysis,and put forward a simplified calculation method for bearing capacity of corroded reinforced concrete beam with modified code.By using this method,the average cross-section corrosion ratio of all the steel bars in the same section can be converted from the corrosion ratio of one or several steel bars detected in the field,which can be used to calculate the strength utilization coefficient of the corroded steel bars,and solve the problem of inaccurate calculation of the bearing capacity when the cross-section corrosion ratio of the steel bar is greater than 10%.
-
2025(2):150-156
Abstract:
In response to the comprehensive characteristics of multiple branching and large flow of the Heishazhou waterway,as well as the complex flow of the tidal river section in the lower reaches of the Yangtze River,the hydrological observation data are analyzed and summarized.Combined with the on-site practical work of the second phase of waterway regulation project construction,in-depth research is conducted on surface velocity and flow direction measurement,gradient observation,hydrological section measurement,etc.in hydrological observation.Modern new equipment and technology are used to optimize the layout of hydrological sections and water gauge positions,efficiently organize and implement,improve work efficiency,and obtain complete and detailed hydrological observation data.This method effectively solves the problems existing in the hydrological observation of the tidal reach of the lower reaches of the Yangtze River,and provides reliable basic data for the project design,construction and related thematic research.The research results can provide reference for similar projects.
-
ZHU Zhengtao, JIANG Qingrong, HUANG Dong, LI Haibin, CHEN Xinchi
2025(2):72-80
Abstract:
Taking a dock project on the left bank of the Beijiang River as an example,the finite volume method is used to establish the one-dimensional hydrodynamic model for the 37.0 km long section of the Shaoguan (II) hydrological station to Mengli hydropower station,and the two-dimensional hydrodynamic model for the 4.6 km long section of the project.A quantitative study is conducted on the differences in flood level,flow velocity distribution,and flood storage capacity of river channels under different construction schemes.The results show that when the flood frequency ranges from once every 50 years to once every 10 years,the increment of flood level is lower than 0.02 m under different schemes.The changes in flow velocity and pattern are mainly concentrated in the local river section from 100 m upstream to 260 m downstream of the dock.However,the changes in high flow velocity areas of the river are relatively small,as well as the changes in the dynamic axis of the main channel.Meanwhile,the actual flood storage capacity of the river has increased under the action of dredging in the harbor.From the perspective of flood safety and cargo safety,scheme 2 is a recommended plan,and relevant research methods can provide scientific reference for similar dock construction plans.
-
2025(2):81-88
Abstract:
Among the four major systems in automated terminals- seaside loading and discharging,horizontal transportation,yard handling,landside collection and distribution-the yard handling system presents the greatest difference across terminals.The Chinese port industry continues to innovate in yard layouts,based on the “vertical layout + end interaction” mode and the “horizontal layout + gate control” mode,introducing innovative transfer modes as well as “vertical layout + U-shaped channel” design.Through data gathering from automated terminals with varied yard configurations that have been put into operation,this study analyzes the characteristics of different yard layouts in terms of key indicators such as safety,land utilization rate,operational efficiency,automation level and energy consumption per TEU.It explores the establishment of a comprehensive evaluation system for the layout of automated terminals,providing a thorough and impartial assessment of various layout patterns to guide the construction and operation of automated terminals.The study also discusses the yard layouts for currently envisioned automated terminals.The research results have reference value for the layout planning and design of new automated terminal yards and the automation upgrading or renovation of traditional terminals.
-
ZHANG Qiyi, MENG Xiangfei, CHEN Kai, GUO Dongqi
2025(2):178-183
Abstract:
High pile structure is a kind of structure widely used in port and coast.Its dynamic response under wave action is the key factor to ensure the stable operation of the wharf.The software ABAQUS is used to build a three-dimensional wharf model and a wave flume with STAR-CCM+.The k-ε turbulence model and volume of fluid (VOF) motion interface tracking method are used to simulate waves,and the simulation of bidirectional coupling between wharf pile groups and waves is realized.Since the ratio of pile spacing to pile diameter is greater than 4,the interaction between piles does not need to be considered,and the error of the comparison model test is less than 5%,which can meet the requirements.The results show that the maximum force and displacement of the wharf pile groups under wave heights of 0.3 m,0.4 m,and 0.5 m can meet the code requirements.The displacement at the top of the pile is the largest,which is 0.66 mm.The maximum stress occurs at the bottom of the front row of piles in the pile group,which is 152.4 kPa.The concrete in the pile bottom area is prone to instability and failure,and special attention should be paid in practical engineering.
-
Impact of Mujing first-lane ship lock discharge pattern on flow conditions in lower approach channel
WANG Zhaobing, GUO Tingting, ZHOU Xidong, HU Ruichang, YUAN Hao
2025(2):127-134
Abstract:
In the context of the double-lane ship locks sharing approach channel project,unsteady flow is prone to occur in the approach channel during lock discharge,causing turbulence in the flow field inside the approach channel,seriously affecting the safety of ship navigation and docking in the approach channel.Taking Mujing ship lock as an example,based on the RNG k-ε turbulent flow model,the navigation hydraulic characteristics of the approach channel are numerically simulated,and the unsteady navigation conditions inside the second-lane lock and the approach channel are analyzed during the discharge of the first-lane ship lock.The results show that when both sides of the first-lane ship lock release water simultaneously,the flow velocity in the approach channel does not meet the requirements of ship navigation and docking,and the formation of reflux,oblique and transverse flow patterns at the front of the separation dike of the second-lane ship lock affects the safety of ships entering and exiting the second-lane ship lock.After adopting the recommended side discharge method,the flow pattern in the approach channel has been improved,and the navigation flow conditions meet the requirements of safe navigation.The research results can provide a solution for the discharge method of double-lane ship locks.
-
YAO Hongcheng, XU Yanwen, ZHANG Wei, JI Xiaomei, HUANG Liming, WANG Xiaoguang, WU Yao
2025(2):36-44
Abstract:
Tidal asymmetry exerts an influence on nearshore material transportation and geomorphic evolution.Based on the Delft 3D FM,a two-dimensional hydrodynamic model is employed to establish the tidal movement simulations of Lingding Bay under the conditions of 1 970 s,2 010 s and the 2016 governing guideline shoreline.The response of tidal asymmetry to the seaward advancement of the shoreline in this area is analyzed by combining the reconciliation analysis and the skewness calculation method.Furthermore,the mechanism underlying tidal asymmetry change is examined by analyzing the contribution of different tidal constituent combinations.The research results show that the tidal height asymmetry between spring and neap tides in Lingding Bay varies.The seaward advance of the shoreline strengthens the flood tide dominance in tidal asymmetry.The seaward extension of the shoreline increases the tidal amplitude of the shallow water components while reducing the amplitude of the astronomical components,concurrently accelerating the tidal wave propagation speed.The contribution of the astronomical tidal components to tidal asymmetry gradually decreases upstream,whereas the contribution of the shallow water tidal components gradually increases.
-
SHANGGUAN Yifei, HE Jinchao, XIE Feng, YUAN Hao, ZHAO Jiang
2025(2):142-149
Abstract:
The Mangdantan channel,consisting of three continuous branches,locates in the middle and lower reaches of the Nujiang River with bad flow condition.To investigate the natural navigation obstruction characteristics in Mangdantan continuous branching channel,the influence of different discharges in normal and dry period on the flow diversion,gradient,water depth condition and current speed distribution are numerically analyzed by the two-dimensional planar hydrodynamic model.The results show that the natural navigation obstruction characteristics include large gradient,insufficient water depth and rapid current speed.In addition,the flow condition in the branches R1-L2-L3 is better than those in the branches R1-R2-L3,therefore the branches R1-L2-L3 are suggested to be developed as the navigation channel.The research results can provide technical support and theoretical guidance for the regulation of Mangdantan and the channel development of similar continuous branching rivers.
-
MENG Xiangyong, XUE Guodong, CAO Baojie, GAO Ruichao, MENG Xiankuo, WANG Hongwei, LIU Shixing
2025(2):191-196
Abstract:
multi-beam echo sounder system is used to monitor short-term erosion and sedimentation changes in the offshore area of the logistics park embankment in Binhai Port.It is found that there is an east-west oriented scour hole on the outer side of the embankment corner,which is about 570 m long and 110 m wide,and its edge has reached the bottom of the embankment,posing significant safety hazards.Through the analysis of monitoring data from May to November 2023,it is found that the edges of the scour hole continues to erode and showed no signs of slowing down.The research results provide accurate data support for subsequent embankment projects.The multi-beam echo sounder system can accurately identify the spatiotemporal changes in underwater topography,offering effective reference for similar embankment deformation monitoring.
