Abstract:Temporary wave blocking facilities are used to provide certain protection for construction ships with poor sea conditions. Airbag-type floating breakwater with convenient transportation，convenient delivery，and low cost has become one of the preferred wave blocking and wave elimination measures. A stable numerical wave flume is established by adjusting the grid division，controlling the time step，and encrypting the free liquid surface network. The hydrodynamic model of airbag type floating breakwater is established by using the same scale of the original physical model test，and the accuracy of the numerical calculation scheme is verified by the test results under the condition of the physical model test. The calculation results show that the calculation results within the range of 3 m after blocking the wave model are accurate，and the error of the wave height is within 1%. The variation law of the calculated value with time under the numerical simulation scheme is in good agreement with the test results. The numerical simulation scheme is feasible and effective，and the numerical simulation results have an available reference，which can provide a calculation basis for the subsequent research on the selection of various temporary wave containment facilities.

Abstract:Research on the wave dissipation performance of floating breakwater under long-period wave plays an important role in the engineering application of floating breakwater. Based on the open-source OpenFOAM，the RANS equation and SST k-ω turbulence model are used to simulate the flow field，and the overset method is used to simulate the interaction between wave and a floating breakwater. By transplanting and applying the MOODY library，a two-dimensional fluid-solid coupling double-pontoon numerical wave flume model is constructed. Through the verification of the existing physical model，the reliability of the model is proved. Then the comparative study on the wave dissipation performance of single-pontoon and double-pontoon is carried out，so the influence of wave height，number of floating breakwaters，the distance of floating breakwaters，and anchor chain stiffness on the wave dissipation performance of floating pontoon is studied respectively. It is concluded that：1）When the wave height increases，the wave dissipation performance of the floating pontoon will be improved. 2）To improve the wave dissipation performance，double-pontoon（or multiple pontoons）should be used as much as possible to shorten the spacing of the floating pontoons. 3）Increasing the stiffness of the anchor chain can also improve the wave-eliminating performance of the floating pontoons.

Abstract:In recent years，there have been more and more environmental protection dredging projects in rivers and reservoirs and port and waterway construction and maintenance dredging projects. Pipeline transportation is the main method of dredging sediment transportation，and the transportation distance is also getting longer and longer. The redistribution of the flow velocity and the critical flow velocity along the pipeline needs to be further studied. The model is calibrated based on the measured data of the clean water conditions and the stratified sampling concentration of the sand transport conditions of the Gulei sand filling project. On this basis，three-dimensional hydrodynamic and sand motion analysis are performed on the long straight pipeline transportation of sand particles. The redistribution characteristics of the section velocity along the straight pipeline and the law of the critical velocity of sediment deposition are analyzed. The formula of the critical velocity of sediment deposition at different sections in the long pipe is put forward，which provides a reference for the design of dredging projects.

Abstract:The reflection and transmission properties are the key evaluating indicators of the breakwater. We carry out the physical experiments to study the influence of wave nonlinearity on the reflection and transmission of a sloping mound breakwater under the irregular waves，analyze the incident and reflected waves in front of the breakwater using a time-domain separation method based on the wavelet transform，obtain the reflection and transmission coefficients of the breakwater，compare the experimental results with the transmission coefficient of the existing sloping breakwater，and discuss the effect of wave nonlinearity and water level on the reflection and transmission. The results show that the reflection coefficient of breakwater increases with the enhancement of wave nonlinearity and water level. The transmission coefficient decreases with the enhancement of wave nonlinearity but increases with rising of water level. Almost all the existing wave transmission coefficient prediction formulae are underestimated the actual wave transmission，especially for a larger water level. This breakwater has a good performance for reflecting low-frequency waves.

Abstract:In order to study the evolution trend of shoals in the Yangtze estuary under the influences of sediment discharge decreasing and human activities and the feasibility of artificial protection measures，we take Hengsha shoal as an example，establish a morphological evolution model of the Yangtze estuary based on the numerical model of MIKE21，simulate the evolution trends of Hengsha shoal under natural environment and artificial protection. The results show that Hengsha shoal will be an overall shrinking trend in the future，the development of channeling ditch occurs，and its stability will be threatened. It is necessary to start the artificial protection measures in time. After the implementation of the artificial protection measures，Hengsha shoal is overall stable，the development of channeling ditch is restrained. It is difficult to create a suitable ecological landform in a short time by artificial protection measures，and the utilization of dredged soil of the Yangtze estuary deep water channel can be combined to accelerate the process of terrain shaping.

Abstract:The tidal current harmonic analysis method is used to analyze the surface，middle，and bottom current data at three continuous stations in the sea area of Liuheng island from August 6，2020 to August 21，2020. The harmonic constants of O1，K1，M2，S2，M4，MS4 of the three stations are obtained，and the tidal current ellipses of each layer are drawn. The results show that：1）The average velocity of the surface rising tide is 33~58 cm/s，and the average velocity of the ebb tide is 27~48 cm/s. The velocity direction is mainly WNW~ESE. 2）The tidal current in the sea area is reciprocating. The nature of the tidal current is mainly regular semi-diurnal tide，and the M2 sub-tide has an absolute advantage. 3）During the observation period，the residual current velocity at the surface is 8~17 cm/s，the residual current velocity of the middle layer is 8~21 cm/s，and the residual current velocity at the bottom layer is between 7~20 cm/s. The direction is WNW. 4）The maximum possible velocity occurs during the ebb tide. The surface layer can reach 149 cm/s，the middle layer can reach 120 cm/s，and the bottom layer can reach 93 cm/s method.

Abstract:As the new crown pneumonia epidemic continues spreading at home and abroad and the Sino-US trade friction continues to escalate，the production，storage，and transportation of food in China attract public attention. In response to the above concerns，we comb the situations of China’s annual grain production，per capita possession，and inventory consumption，etc.，analyze China’s grain receiving and unloading situation of the foreign trade and the development of the domestic trade “North-to-South grain transportation” system in China’s coastal areas，research the grain transportation pattern of China’s coastal ports of both domestic trade and foreign trade，summarize the current layout of grain specialized terminals and problems existed；and propose that China’s foreign trade in grain is mainly based on soybean imports，most of which serve the grain and oil processing harbor industry，with receiving ports mainly arranged in Guangzhou Port，Rizhao Port，Tianjin Port，Qingdao Port，etc. The pattern of the domestic grain trade “North-to-South grain transportation” is basically stable：Dandong Port，Dalian Port，Yingkou Port，Jinzhou Port，and Huludao Port in Liaoning coastal area are the main loading ports in the north；while Suzhou Port，Nantong Port，Taizhou Port in the Yangtze River Delta and Shenzhen Port，Dongguan Port，and Guangzhou Port in the Pearl River Delta are main unloading and transshipment ports；Ningbo Zhoushan Port shows more obvious logistics characteristics of foreign trade import to domestic trade export. The traditional grain transshipment function of Shanghai Port has been weakened，and the layout of grain transshipment and receiving terminals in the southeastern coastal region of Zhejiang Province should be further strengthened.

Abstract:For the influence of the bottom material on the anchorage site selection，we compare and analyze research results on the bottom material of the anchorage at home and abroad，analyze the anchor holding power coefficient of different anchor types corresponding to different bottom material conditions through according to anchor holding power test results，discuss the influence of the anchor type and the bottom material on the anchor holding power，and classify the anchor bottom material conditions according to the anchor holding power coefficient of different anchor types. We also analyze the influence of the bottom material on the friction of the laid chain and give the friction of the laid chain of the typical large ship on different bottom materials，and explain the influence of the length of the laid chain on the anchoring of the ship. The conclusion is drawn that the suitability of the bottom material of the anchorage is related to the type，grade，and anchor type of the ship using the anchorage. The ship type using the anchorage should be analyzed and demonstrated in detail，and the anchoring test should be carried out if necessary.

Abstract:Ignoring the concave-convex joint constraint in the transfer of the adjacent structural sections of the high-piled wharf’s lateral force can lead to a large bent distribution coefficient. We simplify the wharf structure as a rigid continuous beam with elastic support horizontally，consider the rotational stiffness，and derive the calculation formula for the distribution coefficient of the lateral force component of the high-piled wharf bent under the constraint of the concave-convex joint and without considering the constraint. Combining with the engineering example，we compare the results of the normative value，and the formula calculation value without considering the concave-convex joint constraint，and the formula calculation value and the three-dimensional finite element method calculation value considering the concave-convex joint constraint. The results show that the results of the formula calculation are in good agreement with the results of the finite element calculation without considering the concave-convex joint constraint，and the results of the formula calculation and the finite element calculation are smaller than the standard value. Considering the concave-convex joint restraint，the lateral force distribution coefficient of the bent frame reduces as a whole，especially in the middle part of the overall wharf structure（near the concave-convex joint）is quite different from the standard value.

Abstract:The small and medium-sized container terminals usually adopt simple，mobile，and flexible handling equipment. The container reach stacker is commonly used in China，while the container straddle carrier is often used in foreign countries. This paper analyzes the impact of different handling equipment on the terminal operation mode，economic indicators of general layout，and overall cost；discussing the applicability of the straddle carrier to the small and medium container terminals；and puts forward problems during design，which can be used as a reference for the similar project design.

Abstract:Due to the complex geological condition，it has a great difficulty to select the structure for the 2×50，000 DWT wharf in Luoyuan bay. To tackle this problem，research and comparative analysis of the wharf structure under similar geological conditions are carried out，and the structure scheme of the wharf is optimized. From the perspectives of technical feasibility and economic rationality，the optimal high piled wharf with the top opened frontal steel sheet pile structure is analyzed.At the same time，the measured data of the on-site survey and operation parameters of the completed wharf are collected and compared with the calculated results，thus verifying the reliability and economic rationality of the structure of the pile high piled wharf with top opened frontal steel sheet piles.

Abstract:To solve the problem of stochastic uncertainty problem of seawall structure safety，we analyze the influence factors such as wave，tide，and wind on the role of the seawall structure based on the Monte-Carlo method of structural reliability analysis theory，and establish the safety of the seawall structure under multiple failure modes analysis of functions and the analysis method according to the characteristics of the seawall structure in our country. Based on the reliability analysis of a typical seawall structure with the established multiple failure modes，we obtain the failure probability of seawall structure under various failure modes and analyze the relationship between the sensitivity of main influencing factors and failure probability. The results show that the method can be applied to the safety assessment of the existing seawall and the safety design of the newly built or planned seawall.

Abstract:To solve the problems existing in global ports such as the poor connection of multimodal transport and conflict of port city development，we adopt the multi-system integration method based on terminal production scheduling platform to deal with the multi-source information fusion，such as multi-software architecture，multi-interface，and multi-data format. For the precise positioning of various equipment in the intelligent overhead rail system under the complex wharf environment，we adopt the method of multi-positioning technology integration in complex scenes. Combining the air rail transport technology with the terminal business demand，we open the last kilometer of sea-railway intermodal transport through three-dimensional transportation mode，which provides a solution for the poor connection of multimodal transport and the traffic conflict between ports and cities，and provides a reference for the application of air-rail in other ports and industries to deal with the ground traffic congestion.

Abstract:The operation of large hub groups in the main and tributaries of the upper reaches of the Yangtze River led to the great changes in water and sand conditions. In addition，man-made sand mining activities before 2017 led to the large-scale evolution of the channel in the Dongxikou group of shoals in the Yangtze River upstream.The changes of splitting ratio and sand ratio in left and right branches，which can make the left channel with relatively straight shape meet the possibility of navigation during the dry season. We adopt the physical model of Dulizi-Dongxikou waterway to study the channel maintenance measures of the left channel under the new conditions，take 8 groups of flow rates from the dry period to the flood period as the control conditions，measure and analyze the changes of the diversion ratio，water level，velocity，direction and flow pattern of the left and right channel before and after the scheme and simulate the process of the ship going up and down the shoal. The results show that the recommended maintenance scheme has little effect on the upstream Doulizi rapid. In each period，the flow direction in the channel is smooth，the flow velocity is stable within 3 m/s，the navigation condition of the ship is good，the navigable water level of the left channel can be reduced from 5 m above the current design water level to 2 m.

Abstract:According to the characteristics of the Mopiling nature-like fishway project and the requirements of fish passing，a three-dimensional turbulent numerical model of fishway pools is established，and the scale of the fishway bottom slope and rest pools is demonstrated. The results show that：1）The vertical slot layout of the fishway can meet the demand of fish upstream. When the bottom slope is 1/250，the maximum velocity of the vertical slot and the bottom hole is 0.90 m/s.2）There is a large range of small flow velocity area in rest pools of different schemes，which can be used for fish upstream rest.3）The range of small velocity areas in rest pools of 20 m pool length scheme is larger than that of 10 m pool length scheme. In addition，it can better meet the needs of fish.

Abstract:The study of local scour characteristics of step-shaped spur dike is of great significance to the design of river channel regulation projects. We study the effects of inflow condition and spur dike size on local scour of step-shaped spur dike by using a 2D flow and sediment mathematical model. The results show that under the constant flow of clear water，the time required for scour to reach equilibrium is mainly affected by the inflow condition，while the geometric scale of spur dike has relatively fewer impacts. With the increase of Froude number Fr，both the area of scouring pit A and the maximum scours depth hs increase linearly. The mean scour depth increases slowly with Fr when Fr≤ 0.565，and increases relatively faster with Fr when Fr＞〖HTSS〗〖KG*3〗 0.565. The height of the first step spur dike and the length of the second step spur dike have a certain degree of equivalence in the influence of the local scour pit shape and scour depth development. Both hs and increase with the relative height of the first step spur dike ψ，and the growth tend to be flat when ψ＞0.7.

Abstract:In the new era，the comparative advantages of inland river shipping，such as less land occupation，less energy consumption，and environmental friendliness，are becoming more and more obvious. The development of inland river shipping has reached a higher level. One sidedness of the traditional economic evaluation method based on transportation efficiency gets increasingly prominent. We systematically summarize the previous relevant studies at home and abroad，further improve them according to the new characteristics in the new era. Then with full consideration of the benefits on comprehensive transportation，regional economic and social development，ecological and environment protection，and culture and tourism by the engineering construction of inland river shipping，we establish a set of index system for the comprehensive economic evaluation of the inland river shipping development，briefly discuss the quantitative and monetized calculation method of each evaluation index，and take the navigation recovery project of the section north of the Yellow River of Beijing-Hangzhou Canal as an example to make an empirical analysis. The results can provide a decision-making reference for the economic evaluation of inland shipping development in the new era.

Abstract:Aiming at the deposition of foreign body in a lock chamber during the operation of ship lock，the influence of foreign body in a lock chamber on the operation and navigation efficiency of miter gate equipment is analyzed. The development of the stop-water anti-blocking device came up with an innovative structure type that could prevent foreign bodies from falling to block the miter gate. It is proved that the device can effectively protect the operation safety of the miter and improve navigation efficiency after the installation in the Three Gorges Ship Lock. The result has a great value of popularization and application，which promote the development of design and manufacturing technology of miter gate.

Abstract:Based on RNG k-ε two equations turbulence mathematical model of VOF method，we carry out the three-dimensional numerical simulation of flow pressure characteristic and downstream navigable flow pattern of Hanqiao water fall project of the Yangtze River to the Huaihe River diversion project，analyze and evaluate the energy dissipation effect，and optimize the scheme according to the velocity distribution and flow characteristics of the original layout scheme. The results show that in the original layout of the Hanqiao water fall project，under the navigation conditions of 20-year return flow and 5-year return flow of the tributary，the transverse velocities at the confluence do not meet the requirements of the planning value，and the maximum transverse velocities are 0.46 m/s and 0.35 m/s. The energy dissipation effect of the optimized scheme is good. The transverse velocity and reflux velocity in the confluence area meet the design requirements. The maximum transverse velocities under adverse navigation conditions with a 5-year return period and a 20-year return period are 0.13 m/s and 0.25 m/s respectively. The optimized scheme can be used as the recommended scheme.

Abstract:In order to analyze the characteristics of the unsteady flow of the downstream approach channel of the Three Gorges ship lift on the operation of lower head tumble gate，we use the Flow-3D to establish a three-dimensional model of the tumble gate operation region and the ship chamber of the Three Gorges ship lift，calculate and analyze the influence factors of different downstream water levels and different fluctuation amplitude flow on the lower head tumble gate by the water flow fluctuation load generalizability theory，analyze the relationship between the calculated moment of the downstream unsteady flow acting on the tumble gate and the measured moment of the tumble gate closing process，and propose the safe operation strategy of the tumble gate to reduce the security risk of the lower head tumble gate due to the unsteady flow of downstream. The results show that the small water surface fluctuation in the downstream approach channel will cause great water surface fluctuation when it transmits to the lower head tumble gate area of the Three Gorges ship lift，but the downstream water level of the hub has little effect on the tumble gate operation.

Abstract:In order to ensure the navigation safety of bridge areas during bridge construction，this paper analyzes the influence of large steel cofferdam setting on waterway flow conditions. Taking the steel cofferdam setting of a bridge in Chongqing as an example，based on the fluid mass conservation equation and Reynolds time-mean equation，and the Fluent finite element software，the second-order upwind algorithm and Green gradient method are used to numerically simulate the bridge axis direction and cross-sectional velocity perpendicular to bridge axis in the steel cofferdam setting river section. Through the comparison and analysis of the change of flow velocity of each section before and after steel cofferdam setting，we obtain the influence of steel cofferdam setting on the flow condition of the channel. The research results indicate that：1）In the direction perpendicular to the bridge axis，the steel cofferdam front-end along the flow direction is about 0.4 Bs~ 3.3 Bs（Bs for the width of the steel cofferdam）velocity increment is most obvious. 2）In the direction of the bridge axis，the flow velocity in section A of the bridge increases sharply，and the turbulence caused by the setting of the steel cofferdam has an impact width of about 3.7 Bs. 3）A vortex street is formed at the tail of the steel cofferdam，which is about 1.3 times the length of the steel cofferdam and 1.5 times the width of the steel cofferdam. 4）The variation characteristics of waterway flow conditions during the steel cofferdam setting are of great significance for the maintenance of waterway navigation safety.

Abstract:The value of ship impact force is very important when designing lock gates or adding anti-collision facilities. Taking Jianbi triangular lock as an example，we use ANSYS finite element calculation software to analyze the time-history curves of the impact force of 25 working conditions under 5 kinds of impact velocity and 5 kinds of ship displacement，and compare the results with the common domestic codes. The results show that the impact time decreases with the increase of impact velocity and increases with the increase of ship tonnage. The impact forces adopted in Code for Design of Hydraulic Structures of Shiplocks and Code for Design of Lock Gates and Valves of Shiplocks do not comprehensively consider the influence of ship tonnage and impact velocity，and the values are too low. The value of ship impact force in Design Specification for Steel Gates of Water and Hydropower Projects is about 0.7 times as the average value of the impact force in finite element analysis.

Abstract:To work out the value of the minimum navigable water level from Badaogou to Yunfeng dam，we analyze the lowest navigable water level of this section by a combination of the observation data analysis and mathematical model，and obtain the lowest navigable water level within the region of more than 180 km，which can be used for the following-up navigable route research of this river section. This research method may serve as a reference for the research on the minimum navigable water level in the hub’s upstream and natural waterway which is lack of data.

Abstract:The Gedi junction in the Changshan River is located in the middle of the “S”-shaped curved river section. The upstream approach channel is on the concave bank of the river channel，the downstream approach channel is on the convex of the bank，and the flow condition of the approach entrance area and the connecting section is complex，so the velocity index cannot satisfy the requirements of safe navigation. Based on the physical model with a scale of 1：80，we study the navigable flow characteristics of the approaching entrance area and the connecting section of the upstream and downstream approach channel and propose the optimized layout scheme. The results show that reasonably dredging the convex bank along the channel and properly regulating the route layout of the approach channel can improve the navigable flow conditions of the approach entrance area and the connecting section，so that the velocity indexes of the approach entrance area can meet the demand of codes concerning the navigable flow，which achieves safe navigation of ships and normal operation of the hydro-junction.

Abstract:The anchorage area is an important supporting project of the inland river plain channel，mainly including the waters where ships are moored and mooring facilities. At present，the gravity structure is often used in the anchorage area of the inland river channel. The traditional gravity-type structure needs a large quantity of concrete and high cost，and a temporary cofferdam should be installed in the local navigation section to meet the demand of dry land construction. The inland plain waterway mostly undertakes tasks of flood control，irrigation，and drainage at the same time. The construction period of temporary cofferdam in the river is long and affects flood control during the flood season. In view of the problems existing in the traditional anchorage structure，the pontoon floating structure and high-piled pier structure are innovatively adopted in the “three-to-two” navigation channel project from the Grand Canal Jining to Tai’erzhuang district（Jining section）. Compared with the traditional gravity structure，it can be constructed on water and does not need temporary construction of cofferdam. Meanwhile，it is more favorable for the river flood discharge and has better adaptability to the foundation，which provides a new idea for the selection of the structural form of inland waterway anchorage area and may serve as a reference for the construction of similar projects.

Abstract:In view of the problems of poor construction quality and low construction efficiency when the trailing suction hopper dredger implements special projects such as slope excavation and sweeping. Based on the dredge track presentation system，we establish the ship，channel，and digital terrain models. Through the engineering application，we analyze the construction quality and efficiency of special projects under its 3D visualization function. The results show that the dredge track presentation system，i.e. the dredging navigation and operation visualization auxiliary system is of great significance for ensuring construction safety and construction quality，and promote the construction efficiency of dredging engineering.

Abstract:Aiming at the problems of a heavy workload，low efficiency，and error-prone in the manual checking of information detail in the application of building information modeling of port and waterway engineering design，we study the automatic model information detail technology based on Unified Standard for Application of Building Information Modeling in Port and Waterway Engineering and Standard for Application of Building Information Modelinging in Port and Waterway Engineering Design，develop the software of model information detail compliance checking by using Revit API and Civil 3D API，and apply it to the actual project. The results show that the technology and software can accurately and quickly achieve the compliance checking of information detail of building information modeling in design，effectively solve the above problems，and can be applied to other port and waterway engineering projects.

Abstract:The traditional research and design method in the metal structure of ship lock engineering has the disadvantages of long period and difficult quality control，which restricts the development of the industry level to a certain extent. BIM technology，parametric technology，and database technology are integrated to realize the design in the metal structure module of ship lock engineering. As the core function of module design，parametric drive design，and 3D-2D correlation design function are the innovation of metal structure design technology of ship lock engineering，which improves the technical system of ship lock metal structure design，and greatly improves the quality of design results and work efficiency. The database of ship lock metal structure design based on knowledge engineering and the expert system runs through the whole life cycle of ship lock engineering metal structure. It has the characteristics of resource sharing and strong inheritance，which plays an important role and significance in promoting knowledge flow and technology innovation platforms.

Abstract:To explore the relationship between the compressive strength and shear strength parameters of cement-mixed soil，we prepare the cement-mixed soil samples with different cement ratios，carry out the unconfined compressive strength test and fast shear test for each sample under different ages，obtain the parameters of compressive strength and shear strength of cement soil，analyze the variation law of strength parameters with cement ratio，determine the cement ratio of 16% and 0.50 water-cement ratio for the project，establish the relationships of unconfined compressive strength and cohesion，and unconfined compressive strength and deformation modulus of cement-mixed soil. The results show that the unconfined compressive strength and cohesion of cement-mixed soil samples increase with the cement ratio，and the unconfined compressive strength and cohesion present a linear relationship. The unconfined compressive strength and shear strength of soft soil mixed with cement obviously improve. The deformation modulus of muddy soil is less than the recommended value of code.

Abstract:For the first time in China，the high replacement rate sand pile composite foundation is widely used in Hong Kong-Zhuhai-Macao Bridge project. The settlement deformation calculation method of the composite foundation is empirical，and the calculation results are often different. Therefore，we carry out the load test of a large composite foundation with a bearing plate side length of 5.4 m to verify the design parameters. We apply the hyperbolic model to fit the load-settlement curve of the load test，establish the relationship between the tangent modulus and the additional stress considering the nonlinear deformation of the foundation，verify the feasibility of the settlement calculation method of the tangent modulus method，and calculate and contrast the settlements of composite foundation under the main structure load by this method and the standard method respectively. The results show that the calculation result of the tangent modulus method considering the nonlinear deformation of the foundation is more consistent with the measured value.

Abstract:For the fatigue design of large-diameter steel tubular restraining piles for floating regasification units，studies are conducted on relevant codes of British Standard，Bureau Veritas，ASTM，and Det Norske Veritas. Details of fatigue analysis theory，analysis flow，and design section zoning are discussed.S-N curve methodology is adopted to calculate the linear cumulative damage of restraining piles under weld class C and D，respectively. The results show that concrete filling，increasing pile wall thickness and weld class can improve the fatigue resistance of the restraining pile. The research results can provide a reference basis for the fatigue design of steel tubular piles.

Abstract:The large-area hydraulic sand ground abroad was usually improved by the dynamic compaction method，and its detection was based on the static cone penetration test（CPT）or the standard penetration test（SPT）. Chinese relevant standards generally directly give the cone tip resistance qc value or the standard penetration number N value as acceptance index，while the acceptance criteria of overseas ground improvement projects is different. The design and acceptance ideas of compaction methods for ground improvement at home and abroad were compared，and the relationships between the in-situ test indicators（qc and N）and the relative compactness of the soil were summarized. Taking overseas projects as examples，the idea and process of acceptance criteria for non-cohesive ground improvement were proposed，and the acceptance curve for dense ground based on qc and N was established. It can provide a reference for the inspection and acceptance of ground improvement of overseas water transportation projects.

Abstract:An offshore terminal in East Africa adopts a high-piled structure. The surface soil layer is thick soft clay，and the bottom layer is weathered mudstone. The pile tip cannot penetrate the moderately weathered mudstone layer，so the bearing capacity of the pile foundation is at risk. Based on the analysis of the pile driving record and according to the results of the static load test and dynamic test，we adjust the driving finishing criterion to ensure that the subsequent pile foundation can meet the requirements on the bearing capacity. Furthermore，we study the bearing capacity of the highly weathered mudstone layer by the experiment. The research result may serve as a reference for similar projects in terms of the requirements of pile driving and the analysis of the pile foundation’s bearing capacity.

Abstract:To ensure the safety of embankment construction，it is necessary to predict the settlement of embankment in different construction stages of breakwater to adjust the construction schedule and working procedure. The traditional settlement prediction methods mainly include Terzaghi consolidation theory，curve fitting method，and BP neural network. The prediction accuracy of Terzaghi consolidation theory and curve fitting method is low，and BP neural network needs a large number of samples to approximate the optimal solution. Aiming at these problems，this paper proposes a prediction method of breakwater settlement in different construction stages based on convolutional neural networks（CNN）. This method is applied to predict the settlement and rate of the embankment in the Dagukou port area of Tianjin port during the construction stage，and the safety risk level mapped by the settlement rate is analyzed by the prediction results，to provide actionable guidance for the actual construction period. The results show that the convolution neural network can accurately predict the settlement rate，and can analyze and guide the results of safety risk level according to the prediction results.

Abstract:The energy dissipation structure of the hopper has an important influence on the overflow loss of the trailing suction hopper dredger. Three kinds of inflow structures of the hopper，i.e. the prototype，the colliding，and the 45-degree high-lift colliding，are compared by the numerical calculation method in this paper. The calculation results show that：1）Compared with the prototype，the vortex distribution of the flow field in the hopper with the colliding and the 45-degree high-lift colliding is relatively concentrated.2）The outflow diffusion range is located in the zones near the outlet for the inflow pipe. 3）The velocity and the turbulence intensity in other zones of the hopper are smaller than the prototype，the turbulence intensity attenuation is more obvious especially in the area near the overflowing cylinder. This shows that the colliding and the 45-degree high-lift colliding structures have a certain energy dissipation effect，which will be conducive to sand sedimentation in the process of loading of the hopper，and achieve the purpose of improving the loading efficiency.

Abstract:In view of the influence of different excavation methods on pile foundations of adjacent bridges，two different excavation schemes are determined by using finite element modeling analysis method for a second-lane ship lock project：Scheme 1 is excavation using a three-level slope with a larger average gradient，while Scheme 2 is excavation using a four-level slope with a smaller gradient. The influence of two kinds of excavation methods on the horizontal displacement，tensile stress，and bending moment of the bridge beam pile is calculated and analyzed. The results show that the steeper the average slope is，the greater the displacement is，the greater the tensile stress reaches its peak value at the excavation point of 16 m，and the bending moment value of Scheme 2 is far less than that of Scheme 1. The research results have improved the research in the field of complex lock foundation pit construction and are of great significance for future engineering design and research in this field.

Abstract:The Zawr project is a comprehensive port development project with a huge volume of works，involving various types of works such as quay wall，channel dredging，breakwater，shore protection，land formation，and soil improvement. The dredging project is very difficult due to the hard surface soil of the sea. Zawar phase Ⅰ to phase IV construction adopts the equilibrium-weigh small cube quay structure，which reduces the input of large hydraulic construction equipment. The armor block of revetment and breakwater is optimized，which guarantees the quality and safety of the marine structure. The innovative dredging technology adopting no-cofferdam backfilling technology and the 200 m3 hydraulic grab ship enable the continuous construction of large dredgers. The optimization of the general layout in line with the owner’s usage requirements and the blowing range of the cutter-suction dredger improve the convenience of terminal operation while speeding up the project schedule. The design and construction technology optimization results can provide a reference for similar overseas water transportation projects.

Abstract:Trailing suction hopper dredgers（TSHD）always waste a lot of time to wait for tide when dredging channels with shallow water，large dredging volume，and longer hauling distance，thus we develop the construction scheme optimization software based on MATLAB for the TSHD. It can predict the efficiency of the TSHD under working conditions of waiting tide and relieving load according to the tidal situation of the construction sea area and choose a more efficient construction scheme. Furthermore，it can calculate the excavation time and thus provide more reasonable references for the construction personnel. It can not only ensure safe construction but also promote the construction efficiency of the TSHD. The research result has been successfully applied to the land reclamation works of Penang City，Malaysia，with the construction period shortened by10% and productivity increased by 7%.

Abstract:“Tian Kun Hao”is the first heavy-duty cutter suction dredger with a side-blowing barge function and actual barge construction experience in China. Aiming at the low construction efficiency of “Tian Kun Hao” in a project abroad，we analyze the data of its barge loading and optimize the key parameters of the 7，000 m3 mud barge berthing and leaving the “Tian Kun Hao” to increase the productivity of “Tian Kun Hao”. Through the test of barge loading of small mud barge cooperating with “Tian Kun Hao”，it is found that the small mud barge with a capacity of 2，000 m3 has problems with “Tian Kun Hao”. Some suggestions are put forward for the improvement of the fender，mooring device，barge loading pipe，and other equipment of “Tian Kun Hao”，which can provide a reference for the reconstruction of “Tian Kun Hao” when the small mud barge cooperates with the construction project.