Abstract:Using the RNG k-ε turbulence model,this paper established three-dimensional hydrodynamic mathematical model to study on the characteristics of drag force of the orthogonal spur dike with toothed mixture embankment of the 12.5 m deep-water channel regulation phase II project in the Yangtze River under Nanjing.The mathematical model is validated well by the measured data of flow velocity,water level and drag force of tooth structure.The drag force characteristics of the orthogonal spur dike with toothed mixture embankment which varies with the change of flow velocity,water depth and dike length are studied using this model.Moreover,the axis distribution of drag force of the orthogonal spur dike with toothed mixture embankment is discussed.

Abstract:Tidal flow mathematical model is used to calculate the dominant discharge and to investigate characteristics and changing rules of the tidal reach from Datong to the Yangtze River estuary.The results show that the flow sediment transport rate method is convenient and the calculation result is reasonable when applied to the tidal reach.There are two dominant discharges for the reach above Tianshenggang,while there is a flow group for the lower reach of Xulujing.The dominant discharge changes little along the way from Datong to Yizheng,and then gradually increases along the way from Yizheng.It should be mainly related to the increase of the tidal prism along the way.

Abstract:The standing position and ship arrangement of a TSHD are restricted by rainbowing distance.By analyzing rainbowing distance parameters,this paper deduces not only the ideal model of calculating rainbowing distance but also another model which involves the air resistance.By TSHD experimental verification,the accuracy of the model involving the air resistance is much better than the ideal model.On the basis of rainbowing distance calculating model,the mixture moving trail affected by the parameters is analyzed,which is helpful for a TSHD to have an optimum standing point and control points in the rainbowing construction.

Abstract:Based on the hydrological conditions of Tongzhou Bay and two dimensional nested gird tidal current and sediment numerical model and the measured data of hydrology and sediment，we simulate and verify the movement of tidal current and the sediment concentration in reclamation of the aqueduct of Tongzhou Bay.The simulation fits well with the measured data.Then，we calculate and analyze the movement of tidal current and sediment by the harbor basin surrounding sea with two engineering projects.The results show that hydrodynamic simulation of flow field can reflect the evolution of the current field and the changes in suspended sediment concentration near the ocean.The flow rate and erosion intensity increase of the reclamation area to the south，that is beneficial to the construction of deepwater wharf.Under the two engineering projects，the flow rate and direction are different.The range and the intensity in erosion and deposition of the second scheme are smaller than the first one.

Abstract:Based on the geologic characteristic of the sea island,we choose the four key factors of reclamation including the position,size,shape,and planar combinations to analyze the reasonableness of the project from the hydrodynamic environment,disaster prevention and mitigation,marine ecological pattern and carrying capacity,as well as economic fields,and discuss the concrete methods for the reclamation planning,to provide reference for the sustainable development and utilization of the island.

Abstract:In order to discuss chloride diffusion due to flexural load in concrete,the influence function of concrete damage Fd under consideration of flexural load is introduced and the test data is compared with ABAQUS analysis results,in which,a subroutine based on USDFLD in the Mass Diffusion module in ABAQUS is developed to take the flexural load and mechanical damage into account.Consequently,multi-physics combined analysis of chloride diffusion due to flexural load on reinforced concrete member is achieved.The results indicate that finite element analysis has a good agreement with tests results.With the increase of load ratio,chloride diffusivity in concrete is accelerated.Furthermore,the promoting effect of tensile stress on chloride diffusion is much greater than that of compressive stress.A new method to study chloride diffusion in concrete is provided in this paper.

Abstract:Multi-temporal satellite remote sensing images were used,in combination with RS-GIS integration technology,to calculate and analyze coastline changes of the Pear River Estuary (PRE).The coastline’s responses to natural factors such as sea-level rise and sediment supply and human actives are analyzed.The results show that offshore coastline extends seaward by 579.2 m,with an extension rate of 19.3 m/a from 1976 to 2006. Moreover,during the same period,open-sea island coastline only extends seaward 21.6 m with an extension rate of 0.7 m/a,which suggest that extension rate of offshore coastline is much faster than by natural aggradation process.Sea-level rise,seem to have minor impacts on the dramatic changes of coastlines of the PRE.The increasing trend of coastline extension rate does not agree with the decreasing trend of the sediment supply from upstream in the 1990s.A detailed comparative analysis indicates that land reclamation is the most dominant factor that controls the observed coastline changes.

Abstract:The concrete structure in the marine environment is easily corroded by seawater,but the high- performance concrete can’t meet the demands of high durability.The technology covering glass fiber reinforced plastics is one of approaches for improving the marine engineering concrete structure.The test methods of raw material and durability covering glass fiber reinforced plastics are analyzed and the test methods are put forward for controlling the construction quality.

Abstract:Based on the combination of Holland typhoon model and CCMP background wind field,the third generation wave model SWAN is used to simulate 0908 typhoon “Morakot” and 1013 typhoon “Megi” landed Fujian.Comparison of simulation results and Jason-1 satellite data indicate that the simulated waves are in good agreement with the satellite data.The time evolution and spatial characteristics of typhoon waves and the change of wave height about three coves in Fujian territorial waters are analyzed.The results show that the maximum significant and wind speed are both on the right of typhoon center,the angle between the wind and the waves is proportional to the distance to typhoon center and it is larger on the right than left,typhoon center corresponds to a low wave height area,wave height distribution in the inside and outside of the strait show greater asymmetry.During the “Morakot”period,the wave height reaches 10.8 m in the northeast of Fujian coast and the wave height is mainly caused by the wind in Xiamen,Xinhua,Sansha bay.During the “Megi” period,the wave height reaches 9.2 m in the south of Fujian coast,wave height is mainly caused by the wind in Sansha and Xinghua Bay,Xiamen Bay suffered some impact of the swell from the South sea area.

Abstract:The paper analyses the salinity distribution and salt-fresh water mixing of Yangtze River estuary by the recent three months hydrology data .The lamination factor and the mixing ratio concept are applied to analyse the mixed type.The result shows that:The salinity of the North Branch is the highest of the four sub-channels and changes greatly between floods and droughts .The North Branch is a typical well-mixed estuary the whole year.The salinity of the three south branches ranks from high to low as follows:the South Passage,the North Passage and the North Channel.The fresh and salt water mixing intensity ranks from high to low as follows:the South Passage,the North Passage and the North Channel,which is adapted to the situation:the water discharge of the North Channel is the highest,secondly the North Passage,the South Passage is the lowest.The mixing intensity of dry season is higher than flood season,while the mixing intensity of spring tide is higher than neap tide.The mixing intensity display cyclic variations over time,which is the highest around the maximum flood and the intensity of flood tide is higher than ebb tide.

Abstract:The semi-circular breakwater has many advantages,such as high stability,simple structure,and convenient construction.In previous research on the reliability of this type of structure,wave loads of breakwater were calculated through the wave height and period,which were regarded as stochastic variable.Estimating the probability distribution models of the above parameters,then the explicit limit state equations can be established and solved.It should be noticed that,for the sequence of wave loads calculated,the dispersion degree of the optimal distribution is poor.Thus,this paper proposed a method of reliability analysis of breakwater based on implicit performance function.Wave height and period are regarded as stochastic variables without the needs of constructing wave loads which are considered as intermediate variable sequence.It is able to avoid the error and simplify the calculation process by this approach.Both the explicit and the implicit methods are applied to calculating the reliability of the semi-circular breakwater.The results show that the difference of the reliability indexes by these two methods is caused by the fitting error for wave load distributions.

Abstract:By using the finite element software ABAQUS,a three dimensions model is established which considers interaction between the caisson and the foundation.Besides,this paper simulates caisson wharf rear pressure distribution under the action of gravity.The result shows that stiffness difference in the direction along the wharf length is caused by the caisson cell and cell backfill in each section,and caisson rear earth pressure distribution appears relatively obvious space characteristic,in the meantime the total force is larger than the calculated value by design codes,which makes the stability of the structure is less securable.Combining with simulation results of engineering examples,a practical and reasonable calculation model of the rear earth pressure is proposed.

Abstract:In order to study the wind-resisting capacity of pile-supported wharf under severe typhoon weather when berthing a 300 000 DWT oil tanker,the three-dimensional finite element solid models were establish by the APDL platform and the Workbench platform in the software ANSYS.The wind-resisting capacity of the identical pile-supported wharf structure was calculated,and the results under various working conditions were obtained by the two models.Meanwhile,it can provide a reference basis for the checking of wind-resisting capacity of existing pile-supported wharfs when berthing large ships by comparing the influence of the different soil models on the wind-resisting capacity of pile-supported wharf.

Abstract:Aiming at the thermal effect on the vertical piled and cast-in-situ deck wharf,comparing inner force results due to the different length(75,150,200,300 m)of structure segment with additional thermal action based on 3D dimension calculation by international finite element software,the results reveal that the internal forces such as bending moment,shear force,axial force of pile foundation and deck elements can be significant reduced by the appropriate growth of segment length plus the effect of thermal actions.

Abstract:For the rubble mound breakwater in deep water,the influence of the property of the core stone on the irregular wave propagation is studied in the way of physical model tests.The external regularities of the irregular wave are analyzed statistically,then the relations between the transmission coefficient of the breakwater,the period and the height of the incident wave,and the weight distribution of the core stone are discussed.Taking these dimensionless parametersHi/d,gT2/d and B/D50 into account,the irregular wave transmission coefficient empirical formula is put forward which is applied to irregular waves,so it can provide some reference for engineering practice of breakwaters and research.

Abstract:The active steel approach bridge of floating dock can move over long distances on the pontoon and cause pontoon heeling in the area where the height of water is large.Concerning this issue,pontoon balancing is studied.Using mechanical balance principle,we develope a new pontoon automatic balancing system which can implemente pontoon automatically adjust to keep the balance.We analyse the pontoon balance under three different working conditions of basic mechanical principle,the design method of pontoon automatic balance system and weight calculation principle.Combined with engineering example,we present problems should be noticed in application,e.g.design method and position of balance bearing and track.

Abstract:With Fluent numerical simulation software,we analyze the wind speed at different heights and different horizontal distances from the underground coal storage with non-stack,compare the change of wind speeds at different heights and distances,demonstrate the feasibility of the new mode for the coal storage,and study the depth and slope of the underground coal storage of port.The results show that under the same wind-proof net,the wind speed in the field of the underground coal storage of port is similar to that of the traditional field and it is more economical due to its larger storage capacity while occupying less area.So,the new coal storage mode is feasible.

Abstract:Based on relevant provisions of Eurocode BS EN 1998,we study a high-piled wharf structure under longitudinal and transverse seismic action by the modal response spectrum analysis method of software ANSYS,and obtain the results of the axial force and bending moment for the steel pile foundation of wharf structure together with the distribution law.

Abstract:This paper establishes two relative indicators,i.e.ratio of dredging volume to shipment volume and economic benefit of dredging per cubic meter,and evaluates the dredging benefits of the Yangtze estuary 12.5 m deepwater navigational channel (DNC)combining with comprehensive utilization of dredging materials.The result shows that the ratio of dredging volume to shipment volume of DNC tended to decline during 2011—2015,and there is a decline of nearly 30% from 1 083 m3/104t in the first year of operation to 765 m3/104t in 2015. In the past 5 years,the economic benefit of the DNC dredging per cubic meter increased significantly,and attained to 142 RMB in 2015,which is much higher than that of the current domestic dredging cost.Meanwhile,the quantity of waterway dredging material used for the tideland reclamation is considerable,which is helpful to control the dredging and reclamation costs,and achieves a win-win situation with an improvement of the utilization rate of dredging material in the Yangtze estuary and increasing land resource reserves in Shanghai.In the current circumstances,the DNC has stepped into a steady operation stage and achieved desired social and economic benefits.

Abstract:The dry season water level is recording low in main branch channel of Ganjiang River sink,in which has adverse impact on the utilization of water resources,navigation,waterfront landscape and water environment.And it will remain gradual decrement trend in the future.This research establishes a 2-D flow and sediment mathematical modal through analyzing the water and sediment characteristics of main branch channel in recent years.It next constitutes a boundary condition by selecting flow and sediment data of 1992,2002,2004,to conduct numerical simulation research.Then,it mainly comparatively analyzed the variation of erosion-deposition,flood and dry season water level,depth of channel and utilization of point bar before and after the implementation of those regulations.In the end,it concluds that those regulation projects can play a very good effect on controlling dry season water level,maintaining navigable depth,improving waterfront landscape and improving the utilization ratio of point bar to promote the local marine economic development.

Abstract:In order to calculate the passing capacity of inland waterway preerably,the concept of gap rate and improves the gap acceptance theory’s model is proposed which considers that ship length is large and not all the bow can be used for the ship to move through.At the same time,it summarizes the rules of collision avoidance at slack water area and determines the three priorities of anisotropic traffic flow of the T-type intersection.Taking into account the influence of impedance effect of high level flow,the calculation method of T-type intersection traffic flow based on the priority is derived. Taking the T-type intersection of Sushenneigang waterway-Shenzhang waterway as an example,the analysis indicates that passing capacity gradually decreases with the increase of conflict traffic and the decreasing trend is the negative exponential distribution.When the conflict traffic is fixed,the passing capacity gradually increases with the increase of speed and the changing trend is slow-fast-slow.Therefore,it is reasonable to calculate passing capacity using avarage speed(eighty percent design speed).

Abstract:The range of Reynolds number has a great influence on the calculation of turbulent width around bridge pier,which will affect the rationality of the calculation results.For the mountain rivers,the Lattice Boltzmann Model(LBM)is used to simulate three dimensional turbulent flow field of bridge pier with supercritical Reynolds number.Combining with large eddy simulation and moving boundary treatment method,we analysed three dimensional turbulent width of bridge piers under different flow and river conditions.Based on the results, the coupling relationship between the circular piers the relative turbulent width and the Froude number in the straight channel and the curved channel is established.Through the waterway width checking of Sichuan Dengjiaba bridge,compared with the empirical method and Zu Xiaoyong algorithm,we find that the turbulence width is smaller and more reasonable.

Abstract:In order to analyse the mechanical characteristics of single anchor sheet pile structure in Xinxiagang double-lane lock,we establish the finite mesh model with ABAQUS.We discusse the choice of soil constitutive model during the excavation of chamber after contruction process has been taken into consideration.At the same time,we get the distribution of deformation and bending moment and the variaty of earth pressure before and after the sheet pile by analyzing the force characteristics of single anchor sheet pile structure during the construction and using period.The results show that for deep excavation problem,modified Cam-Clay model can reflect the bulk properties of soil better and when the construction is completed the earth pressure behind the piles performs the classic “R” type distribution while the earth pressure before the pile is basically a straight line,but in the face of the excavation,the stress will increase substantially due to the deformation and squeeze of sheet pile.During the using period of the lock,water level changes frequently and the floor brace can bear about 80% of the pressure increment caused by the water pressure.That means it can effectively improve the stress state of the sheet pile structure.

Abstract:Based on the experimental study on the navigation technique of Honghua hydro-junction project and the overall physical model,we study measures for improving the navigation flow condition and optimizing the operation mode of the junction.The result shows that under the condition of rather complicated current at the upstream of the junction and swirl and swirling water bubbles at the entrance area,we can adjust the flow through setting diversion dams, partial leveling and adjusting the length of the diversion wall;while the flow at the downstream can be adjusted by optimizing the operation mode of the hydro-junction.

Abstract:In order to study the influence of discharge of Wujiangdu hydropower station on navigation of Wujiangdu port,the two-dimensional unsteady flow mathematical model was established,and the model was verified with the nature water level and current.Navifation condition of steady flow was simulated and analyzed.According to unsteady flow on navigation discharges of the station,navigable hydrodynamics were studied by using velocity and river slope and water level change in 10 minutes during discharge.The influence of discharge for berthing was analyzed in the accordance with the ability of upriver ship.

Abstract:After the impoundment of the Three Gorges project,riverbed of the sandy gravel reach of Yichang-Dabujie had been eroding continuously,and water level in the same discharge dropped gradually in the dry season.Based on the real-measured data,this paper probes into the reason for the water level’s dropping in the dry reason and its effects on the navigation condition.It is concluded that riverbed erosion is the main reason for water level’s dropping in the dry season. With the further dropping of the water lever in the dry season,to ensure the operation of Gezhouba navigation lock,the navigation lock dispatch pressure would increase,and navigation obstruction problem in local pebble shoal would turn more serious.

Abstract:Large TSHD rainbowing medium-coarse sand reclamation is different from traditional reclamation in ship machine equipment,critical velocity and pipeline arrangement.Aiming at medium-coarse sand property,special software is developed to calculate the critical velocity and the lowest practical velocity for different particle sizes;based on pump property and pipeline friction characteristics,the best efficiencies of the typical TSHD are calculated;quick connector methodology is researched with immediate-levelling and post-levelling within reclamation area,which can improve large TSHD rainbowing medium-coarse sand reclamation working efficiency.

Abstract:Analyzing some examples of pile-supported wharf modeling,we adopt thep-y curve method to study the soil-pile interaction and discuss the effect of load patterns for pushover analysis of pile-supported wharf.The stresses and the displacement under different loading patterns are analyzed and compared.In addition,the results are compared to that calculated by the time history method.Results show that the yield sequence of pile foundation is mainly affected by the slope of pile and the inclined direction.The uniform distribution loading pattern represents respectively the maximum values calculated by the pushover analysis for aseismic calculation.The result of the concentrated force loading pattern and the SRSS loading pattern are very close to that by the time history method.

Abstract:Geotechnical investigation forthe master plan of Massawa New Port is carried out.According to the historic data and in combination with the engineering practice,we obtain the geologic characteristics and geotechnical parameters of the project to be implemented.Volcanic strata had analyzed during investigation’s period,especially assessed upper volcanic and lower volcanic clay by drilling,in-situ test and laboratory test.Analysis and causations are given in the paper that chose volcanic strata as foundation bearing capacity layers;also the paper offers bearing capacity to provide application value for the design and construction of the project.

Abstract:There is no appropriate 3D visualization system,which is targeted for deepwater channel regulation engineering of the Yangtze River.Available digital tools currently have not excellent visualization effect,and the dynamic data information inquiry is inconvenience,and those tools can not effectively reflect the situation in the process of riprap in time.This study develops a set of waterway engineering riprap section forming process visualization software based on the MATLAB platform,which has a fully independent intellectual property,targeted and 3D displaying.It can realize the visualization of 3D terrain display of original terrain,design terrain and riprap terrain.Through contrast before and after the riprap terrain,the software reflects leakage or super throw of riprap construction area in time,and it can help improve the schedule and accuracy of waterway regulation riprap construction engineering.

Abstract:No.28 Quay of Ashdod Hadarom new port is a steel pipe pile foundation of high piled wharf.Site construction should face technique issue of the wide variedly construction procedure of fabricated mobile platform,the pile driving precision control,floating platform anchor limited anchor position and the limited window period of Jack-up platform moving.Through the deep analysis of traditional construction method,we creatively adopt hydraulic moveable platform,which can solve the site technique problems and ensure No.28 Quay pile driving smoothly.

Abstract:Combined with the Hong Kong Zhuhai Macao Bridge Tunnel Engineering foundation leveling, the calculation methods are put forward to analysis inserting and pulling pile of leveling ship legs in different geological conditions. It is concluded the leg buried layer of self elevating riprapping leveling ship in the work state , and the ultimate bearing capacity and pullout ultimate load of pile legs in the construction of the leveling ship inserting legs. At the same time, pre control measures in the special geological conditions are put forward. The practice proves that the analysis and calculation method is correct.

Abstract:Due to the high bearing capacity and strong adaptability to various types of foundation,the cast-in-situ pile is widely used in the harbor foundation design.Although the cast-in-situ pile construction technology is already quite mature under normal condition,it faces great difficulties under the extreme topographic condition and unfavorable geology.Incorrect understanding and improper construction technology will lead to hidden trouble for the quality and bring the economic loss.Taking the cast-in-situ pile construction for a harbor engineering in Nanjing city for example,we summarize the construction technology for the punched cast-in-situ pile under special conditions to serve as reference for the similar engineering construction.