Abstract:Taking Shuangjian shoal in Fujiang shoal reach as a study case,we analyze the formation cause and distribution law of the beach flow of Shuangjian shoal by the prototype observation data analysis and mathematical model method,and probe into its impact on the deepwater channel.The results show that in the ebb tide,due to the gradual weakening of the flow capacity below Zhanchun port in Fubei channel,the flow entering Fubei channel crosses over Shuangjian shoal beach face gradually and enters Liuhai shoal reach;while in the flood tide,flow in Liuhai shoal reach crosses gradually over Shuangjian shoal beach and enters Fubei channel.The size and intensity distribution of the beach flow relates mainly to the upstream inflow and the terrain conditions of Shuangjian shoal beach， i.e.,the beach flow moves downward in the floods and upwards in the low water.The beach flow with great intensity is unfavorable for Shuangjian shoal beach face’s stability,and the transported sediment due to scouring is disadvantageous for the maintenance of the adjacent channel depth condition.

Abstract:This paper studies the local scouring depth and scope of theManyusha shoal regulating structure with and wihout bottom protection by thepart normal physical model experiment,based on the result of which,the key protection areas of Manyusha shoal regulation engineering is determined and the bottom protection scope for Manyusha shoal regulating structure design is proposed.

Abstract:Based on the analysis of the construction technique of the domestic and foreign deep water precise stone filling,the underwater real-time measurement and control system and the deep water droping and filling equipment are designed.By testing and retesting section,the technique of riprap elevation data and the plane position deviation are controlled within specifications,which has a high degree of automation,strong adaptability to operating conditions,high efficiency operation.

Abstract:The water waves were numerically studied by the elliptic mild-slope equation which introduced wave-breaking effect and considered the refraction,diffraction and reflection on the near-shore mild-slope coastal.Under a automatic quad-tree grid system,the numerical model was solved by finite volume method.The primary grid would be divided if the local wavelength is smaller-than-eightfold grid width to insure the accuracy of the elliptic mild-slope equation.The numerical results were compared with physical experiment data and the field measurement data,and the results showed that the numerical model has preferable adaptation to near-shore complex zones.

Abstract:On account of the special natural characteristics of Qiantang estuary,the regulation and reclamation in large scale on Qiantang estuary have been carried out since 1960’s.Based on the numerical simulation of the hydrodynamics and water environment in Hangzhou bay by MIKE,the influence on flow field,salinity field and water quality of Hangzhou bay has been studied.The result shows that the project affects only its adjoining waters,and it increases the speed of water flow in the estuary.The project can also make the salinity contour backward,and decrease the intensity of saltwater intrusion.The contamination from the Qiantang river will diffuse faster after the reclamation project,while it will reduce the water pollution in Qiantang estuary.

Abstract:In order to improve the accuracy of tidal level prediction in port and wharf，we propose a self-adapting particle swarm optimization(SAPSO)algorithm to optimize the back propagation(BP)neural network model.The model is referred to as SAPSO-BP model which employs PSO to adjust control parameters of BP network.This novel model overcomes the shortcoming of traditional BP neural network,which is sensitive to the initial weight threshold and is easy to trap in local minimum.The real-measured tidal level data of Isabel port is chosen as the test database to verify the practicability and reliability of the SAPSO-BP prediction model.

Abstract:The numerical model for wave propagation in rigid vegetation water was developed based on Boussinesq equation,in which the drag force due to vegetation was added.The model was verified by comparing the numerical and experimental results.The model was used to test the effects of vegetation parameters as well as the incident wave parameters on wave propagation.The numerical results indicates that the ratio of wave height attention and wave energy attention increase with the increasing of plant density and plant diameter,as well as the incident wave height.

Abstract:This paper studies the transformation model from the Changjiang waterway current surveying and mapping results to the 2000 national geodetic coordinate system.Based on the 2-D polynomial approximation model,transformation technology route is put forward.Upon examination,average model accuracy is better than 0.15 m,which meets less than 1:2 000 scale channel chart transformation precision.The method lays the technical foundation of Changjiang waterway converted to CGCS2000.

Abstract:Considering the structure of pile supported wharf,the response spectrum method was used to analyze the seismic response under different horizontal earthquake directions in a foreign wharf engineering project.The change rule of the structure displacement and internal force of pile foundations under the influence of different direction of earthquake is compared and studied.The results show that horizontal torsion effect has a significant influence on structure and the seismic effect of wharf structure should be calculated by translation-torsion coupling mode-superposition method while the center of mass and rigidity are inconsistent.In the condition of horizontal direction earthquake effect,the horizontal seismic force of pile closed to the landside is the biggest while the horizontal seismic force of side pile is bigger than that of middle pile group.The force influence of corner pile must be check and taken in account and the pile arrangement shall be adjusted to reduce the adverse effect caused by structure torsion during design project.

Abstract:The typical reliability analysis methods are introduced.The performance function is defined and extreme value distribution theory is discussed.The conversion massed of the armour blocks are derived from the Qinhuangdao hydrologic database.The extreme value distribution theory is adopted to fit the conversional armour block mass.It is found that lognormal distribution fits well of the conversional armour block mass distribution.From the case study,the reliability index computed by Monte Carlo simulation method is less than the index computed by JC method,but both less than the value specified in the standard.In Monte Carlo simulation method,reasonable simulation time is recommended.

Abstract:This paper introduces a new type of breakwater,i.e.semi-permeable caisson breakwater.By the hydraulic model test conducted in a glass wave tank,we measure the wave characteristic parameters in front of and at the back of the semi-permeable caisson breakwater at various wave heights and periods of the wave action.The objective of this project is to investigate the reflectivity of semi-permeable caisson breakwater under different wave conditions,and analyze the relationship between the period of the wave and wave steepness.Furthermore, we probe into the wave dissipation principle and performance of the breakwater.According to the test results,we select the the best combination of permeable rate and slope gradient,which provide a new way of thinking for the conceptual design and planning of wave protection and wave dissipation in the open port.

Abstract:Based on the N-S equation,and the momentum source method,and the VOF method for tracking the free surface,a numerical wave flume is obtained,which can both generate and absorb waves.The wave transmission and wave overtopping of permeable breakwater are numerically simulated by the numerical wave flume.Compared with the experimental data available,the presented numerical wave flume can numerically simulate the wave transmission and wave overtopping of permeable breakwater.

Abstract:The special feature of wave-piercing catamaran is fast,high maneuverability,water jet propulsion system and non-vessel springboard.Considering the characteristics,a comprehensive study on the key technologies of wave-piercing catamaran terminal which includes terminal layout,handling technique,land and water scale,wharf surface elevation,the design depth and channel depth are carried out.

Abstract:At present,belt conveyors in bulk terminal move at constant speed in a variety of operating conditions,which causes serious waste of power energy.In view of the above-mentioned facts，intelligent variable frequency speed regulation algorithm is studied to achieve that the belt conveyors regulate their speed intelligently according to the material flow.And the problems of low efficiency and high unit energy consumption of belt conveyors caused by uneven distribution of material flow,long time no-load and low load operation were solved.It has been verified by practical applications that this algorithm has remarkable effect on energy saving.

Abstract:Based on the dredging site data of year 2013 to 2015 in the south passage waterway,we analyze the maintenance features of the 5.5 m navigation channel of South Passage,and discuss the further maintenance situation of the navigation channel.The results show that the maintenance of the 5.5 m navigation channel of south passage is generally kept in a good situation during the past 3 years,and its maintenance features are mainly as follows:1)the dredging location of navigation channel is mainly in the local shallow region near the Jiuduan Lightship;2)the in-year sedimentation of the 5.5 m navigation channel has seasonal differences with siltation in the flood season and erosion in the dry season;3)the existing depth of navigation channel is not easily affected by typhoon-induced sudden siltation.In view of the characteristics of 5.5 m channel maintenance at the present stage,it will keep in good situation of easy maintenance for the south passage waterway.

Abstract:We use general finite element software ANSYS to simulate viscoelastic artificial boundary calculation program.The feasibility of the program is verified by an example.The dynamic calculation model of chamber structure is established based on the calculation model.Under conditions of fixed boundary and viscoelastic artificial boundary,dynamic calculation of different boundary range is programmed.The results show:compared with fixed boundary,viscoelastic artificial boundary is more reliable.Under the action of earthquake,acceleration response is most obvious at the top of the lock wall.The maximum value of the tension stress response is in the bottom of the lock wall.The stress in the bottom of the ship lock appears as tension stress in downside,and the maximum tensile stress value in lock bottom is larger than that in the lock wall.The structural responses to stabilize when the boundary range takes 2～3 times the size of the lock bottom.

Abstract:Based on the integrated physical model test,we study the navigation condition at the entrance areas of the shiplock approach channel and the connecting section of Yakou hydro-junction in Hanjiang river. The navigation condition of shiplock and influential factors under the engineering arrangement in design scheme are expounded. In view of the disadvantages of navigable flow condition which exist in the design scheme,we propose the optimized measures such as the layout of circular-arc separation levee on the lateral side of connecting section at the upstream of the shiplock and the local dredging in the channel bed.Experiments show that it is a good method to solve the navigation problem of shiplock in the hydro-junction.

Abstract:The reach of Wanzhou Guandaoqi is wide alternating with narrow,which is the typical representative reach of the Three Gorges regular reservoir area.Based on the bulk of measurements,this paper analyzes the evolution of river bed since the impoundment of the Three Gorges reservoir.The result shows that the Three Gorges regular reservoir area is not the whole river siltation,but presents“point”or“segment”decentralized distribution of siltation.Channel geometry shares a close relationship with sedimentation accumulation distribution and siltation intensity,and siltation plane is mainly distributed in wide reaches,bend convex bank below,deep trough and other parts.Siltation intensity in river gully section is relatively large,but it is smaller and even scoured in small narrow section.

Abstract:Water diversion project from the Yangtze River to the Huaihe River is a major strategic allocation of water resources engineering,which has tasks such as water supply,navigation,ecology and other development. It is planned to choose Zongyang hub as the diversion channel,and a 1000-ton ship lock is to be constructed,acting as a channel connected with the Yangtze River main waterway. By checking channel conditions of Zhongyang branch，we use the mathematical model to analyze the flow pattern of the lock’s outlet.It is concluded that the Zhongyang branch can be used as a route.Through the design ship,channel width,depth and bend radius,we propose a reasonable shipping line plan.

Abstract:Xiangjiaba hydropower station in the Jinsha river has a big installed capacity.During operating,it will cause downstream unsteady flow which makes the big water level variation amplitude,and thus influence seriously the waterway maintenance management of Yibin to Chongqing reach of the Yangtze River. Based on the long river unsteady flow mathematical model,we study the development of the unsteady flow,analyze the influence of the daily regulation of waterway maintenance,and put forward corresponding maintenance management measures.

Abstract:The sediment is dramatically reduced after the impoundment of the Three Gorges Reservoir.Experiments on the sediment deposition effect by the soft waterweeds structures are carried out in the low flow velocity region of the beach protection area of the Jingjiang Yaojian reach in the middle of the Yangtze River.This paper introduces the design idea,components design,sediment deposition mechanism and construction procedure of the waterweeds pats.The effect of the project is also analyzed.This new structure enriches the sand deposition structures.

Abstract:According to the flow feature of the upstream approach channel of the second-line shiplock in Dayuandu junction,we explore the influence of the three main factors including the navigable flow condition at the upstream entrance area of Dayuandu junction,the discharge capacity near the sluice gate lock holes and the length of braking area in the approach channel on the arrangement of the navigable wall at the upstream approach channel using the overall hydraulic model experiment and ship model experiment,in which,the adaptability of arrangements of three lengths are compared and the conclusion is drawn that proposal of 130 m navigable wall has the best flow condition at upstream entrance area and meets the requirements of the length of braking area;the proposal of 300 m navigable wall has the least influence by the circulating flow area and the best discharge capacity of the sluice.Considering comprehensively the code stipulations and requirement of the length of the braking area,and to maximize the discharge capacity of the sluice,we choose the proposal of 130 m navigable wall as the recommended one.

Abstract:Taking the isolated rocks in Luziliang reach in the Three Gorges Dam as the research object,the falling of water surface and the squat of ships is demonstrated using analytic solution,mathematical model and simplified flume model tests.Considering the planning of the Yangtze River waterway and the trend of bigness ships,the reef blasting depth is determined.After project implementation,the channel has been broadened,and the channel maintenance and the sailing safety are guaranteed.The regulation effects are good.

Abstract:Based on the gravity ship lock chamber structure,the finite analysis software ABAQUS integral algorithm was used to establish the three dimensional finite element model of ship,lock chamber structure and soil.The process of collision was simulated to obtain the impact force-time curve and the value of impact force in different working conditions.The results show that the normal average value of ship impact force is linear with the square root of ship displacement,the first power of impact velocity,the first power of impact angel.Comparing the normal average value of ship impact force of software simulation with the calculated value according to JTJ 307—2001 Code for Design of Hydraulic Structures of Shiplocks,it can be concluded that the calculated value is relatively small,and the influence of the ship impact force to lock wall is underestimated.

Abstract:According to Fuchunjiang river lock reconstruction project,we probe into the diversion standard for the medium-high-head hydraulic lock’s cofferdam expansion project,the overall layout and structural design from the design point.Under the prerequisite of satisfying the demand of flood-control,power generation and channel variation,we determine the dry season flood control level of the cofferdam.Combining with the arrangement of the lock’s hydraulic structure,we optimize the overall layout scheme for the cofferdam,and propose overfall cofferdams of different structural types for different sections of cofferdam,to serve new design ideas and train of thought for the design of similar high-head lock reconstruction project’s cofferdam,and add new features for the cofferdam engineering.

Abstract:This paper analyzes the adaptability of the auto-inserted retaining wall in the Changjiang waterway engineering relying on the high beach protection project in the Xinchang Zhoutian waterway. After one high flow season,the monitored results show that the lateral displacement of the retaining wall is limited to 20 mm and the maximum sedimentation is smaller than 15 mm. It reflects that the auto-inserted retaining wall can preliminary adapt to the complex flow scour condition and fulfill the design requirements,which builds a foundation for its further extending application in Changjiang waterway engineering.

Abstract:Using swing wave-making device to exert wave loading,a model test is conducted to study the deep-water group piles.Simulating different scour depths by excavating the pile-surrounding soil,we probe into the dynamic response of the pile foundation at different depths under the wave action.Parallel contrast tests of single pile foundation at the same parameters are also conducted for a comparison.The results show that the natural frequency of deep-water structure is changing during the vibration.As the scour depth increases,the natural frequency of pile decreases,and the acceleration and displacement of the pile top also increase.At the same time,these responses increase with the increasing depth of water.In design,both piles’ scouring damage degree and hydrological condition should be considered.

Abstract:It is common to use punching cast-in-place pile or drilling one to embed into rock under the geologic circumstances that silt stratification is thick and supporting course is rock foundation.However,safety issues including cave in and collapse arise in the process of construction.Therefore,breaking through the bottleneck that the precast pile can not cross the boulder and stonefall to realize rock embedment is an issue to needing study in the engineering.Combining the engineering design and actual construction,we adopt different types of piles and pile shoes and realize the embedment of the precast pile in the rock foundation.

Abstract:To investigate the bearing behaviors of lateral loading piles,we predict the ultimate bearing capacity of lateral loading pile based on BP neural network.Taking the pile diameter,depth of pile embedment,eccentricity of load,undrained shear strength of soil as the input of neural network,we obtain the prediction model of pile bearing capacity based on BP neural network.It is found that the average value of relative error of fitting value of pile bearing capacity compared with the observed value for 31 groups of independent variables training BP neural network model is 4.5%;and the average value of relative error of prediction value of pile bearing capacity compared with the observed value for 7 groups of independent variables validating BP neural network model is 5.4%.The conclusion is drawn that the prediction model of bearing capacity of lateral loading pile based on BP neural network is feasible.

Abstract:The steel concrete composite pile combines the low cost of concrete cylinder pile and good flexural performance of steel tubular pile,and reduces the cost under the premise of satisfying the project quality requirement.Combining with the engineering practice,we carry out the dynamic piling stress test to study the effect of the stress transfer by the connecting section.The results show that the design of the connection section is reasonable and it plays a good role of stress transfer.

Abstract:Depending on the one foundation treatment engineering in Qinzhou port,we detected the treatment effect of 15000 kN?m energy-level dynamic compaction replacement method on soft foundation based on some tests.The tests are multi-channel transient surface wave test before and after dynamic replacement,dynamic penetration test and bottom condition of replacement piers and static load test after dynamic replacement.Some conclusions have been drawn.Firstly,the bearing capacity of foundation was improved after dynamic replacement.The bearing capacity was larger than 200 kPa with compression modulus larger than 20 MPa.Secondly,the effective reinforcement depth of 15 000 kN?m energy-level dynamic replacement was about 7.0 m to 10.0 m and average effective reinforcement depth was about 9.0 m.Finally,after dynamic replacement,there existed non-uniformity between replacement piers and soil among piers.And there existed non-uniformity between dynamic replacement zone and surrounding compaction zone.Therefore,non-uniformity of foundation soil after dynamic replacement should be fully considered during building design.

Abstract:A large area of soft soil foundation is divided into several blocks according to the geologic conditions and the application function.Different ground treatment methods such as dynamic compaction,dynamic replacement,stacking preloading are selected to be applied to different blocks and form a comprehensive solution.On the premise of ensuring construction feasibility and satisfying the application requirement,the single solution can cut down greatly the investment.Based on the engineering implementation and testing conclusion,we summarize the adaptable conditions of different means for ground treatment.

Abstract:Based on the construction of Hadarom port at Ashdod,Israel,this paper generally introduces the method of stone column offshore construction with the actual work efficiency,and analyzes the influence of strong wave condition on position deviation control and work efficiency.Due to the bad wave condition in open water,the traditional construction method as the vibration equipment installed on the barge can hardly meet the milestone requirement of large-scale construction,which is low work efficiency,limits operation window time,and is low construction precision.In order to overcome the wave condition influence and solve the work efficiency problem,we propose a solution as the self-elevating platform(Jack-Up)for stone column offshore construction.

Abstract:The temperature crack control of mass concrete is the key and difficulty in underground concrete structure engineer.In the underground structure of roll-over machine room of a port,the expansion reinforcing is applied instead of the post-cast strip.With the assistance of Midas civil software and ISDN mass concrete temperature monitoring system,the temperature and stress of the hopper concrete beam is monitored and analyzed.This method avoids the formation of concrete temperature crack and reduces the construction time.It also achieves excellent economic benefit.

Abstract:Considering the coral reef rock mining difficulty in dredging project,the paper analyzes the coral reef rock mechanics index based on large amounts of geotechnical test data.The results show that:1)Due to its water-softening characteristics of dredge coral rock,a reasonable stage excavation procedure should adopts；2)The relativity of moisture content with saturated uniaxial compressive and tensile strength,and with modulus of deformation are strong which all the three regression coefficients of empirical formula are above 0.691；3)Water has important influence on the mechanical properties of coral reef rock,mainly about physical weakening effect and mechanical effect.

Abstract:With the economic development of port hinterlands in the Third World countries,numerous port rehabilitation and upgrading projects emerged.This paper analyzes the constraints and key issues arisen in these projects based on a case in Africa,and carried out a comparative analysis on the reconstruction scale determination,the design of new quay line and the general layout of ro-ro terminal,the stability and integrity of marine structure,as well as key factors needing consideration during construction.