Abstract:In response to the imbalance of the regional ecological environment due to the destruction of the original geographical features and vegetation in the process of basic engineering construction in China in recent years，we research the ecological grass-planting concrete and its construction technology with both ecological protection and slope protection functions. Using low-alkalinity special materials，large-size aggregates，and optimized mix design methods，we make the ecological grass-planting concrete with strength≥7.0 MPa，porosity≥30%，and alkalinity pH≤9.0 to meet the basic requirements of the plant growth. Based on the indoor test and model test，and relying on the overall development of the PPP project in the industrial new city of Qingshuitang Old Industrial Zone in Zhuzhou City，we determined the key construction technology of ecological grass-planting concrete and successfully applied it to the slope engineering. The 90-day vegetation coverage rate after slope treatment was 95.3%，which effectively solved the hidden dangers of landslides and greening problems.

Abstract:The assembly building has high construction efficiency，reliable quality，and conforms to the green，low-carbon and sustainable development concept advocated by the country. Thus it is the direction of future development. This article combines the existing engineering examples of the assembly gravity concrete bank revetment structure in my country in recent years，and forms a complete set of technology through comprehensive and systematic research，analysis，and refinement of key technologies such as structure selection，component disassembly，component connection，mold assembly，transportation，and hoisting，etc. This technology can provide a safe，reliable，economical，and demonstrative method for the design and construction of the assembled gravity concrete bank revetment structure.

Abstract:Shenzhen-Zhongshan River-crossing Link is another cross-sea traffic project in China integrating bridges，islands，tunnels，and underwater interchange after the Hong Kong-Zhuhai-Macao Bridge. With the important mission of bridge-tunnel conversion，whether the west artificial island can be quickly and safely formed is a key part of the whole project. The west artificial island has high functional requirements，a short build period，and certain difficulties in design and construction. This paper demonstrates the overall design of the west artificial island and rapid island-formation technology，which mainly includes the location，shape，and plane layout of the island，the diameter of the steel cylinder of the island wall structure and the DSM assisted vibration sinking construction，which can provide experience for the construction of large artificial islands in the deep sea.

Abstract:Aiming at the problem that the traditional numerical simulation method is insufficiently representative to the navigation safety research under the complex wind，wave，and current conditions，we borrow the research methods of domestic large-scale hydropower projects and inland ports，use the method on-site actual vessel maneuvering test combining with multi-factor observation，take the third phase of the car and passenger ferry terminal project in Shenjiawan of Shengsi County as an example，conduct comprehensive observation of various influencing factors such as wind，waves，and currents，demonstrate the rationality of the research project layout，and propose the measures to ensure navigation safety combining with the ship position varying during berthing process. The results show that the measured scheme can accurately observe the influencing factors of ship handling safety，accurately quantify the data of influencing factors，and make full and reasonable use of shoreline resources on the premise of ensuring ship safety.

Abstract:The corrosion damage of pile foundation is one important factor affecting the safety of structures under the humid and hot ocean environment，and it is the bottleneck of increasing the service life of piled wharves. Based on the simulation system of indoor marine humid and thermal environment and Faraday’s law of electromagnetic induction，we apply the method of external DC power supply to carry out the artificialy accelerated corrosion behavior，study the corrosion characteristics of CFRP-concrete filled steel tube pile foundation based on the law of more serious corrosion and higher potential value by using the theory of semi-battery electric potential. The results show that the more severe the corrosion is，the higher the potential value is. Two layers of CFRP are more effective than one layer of CFRP.

Abstract:Under the influence of sea-level rise caused by global warming and intensive human activities，salinity intrusion in the Pearl River Delta （PRD） has obviously intensified. It is necessary to analyze the main dynamic factors and the response trends of salinity intrusion. We establish a coupled 1D-3D coupled water salinity model，carry out the sensitivity test with the topography，upstream discharge at main station and sea-level rise changing respectively，apply the flux mechanism decomposition method to analyze the salt flux along the main streams of Xijiang River and Beijiang River，and discuss the response law of salinity intrusion in the estuary network to the change of main dynamic factors. The results show that the salt transport flux at all outlets are dominated by advection transport. Changes in topography and upstream discharge have a greater impact on the salt transport flux than the sea level rise. The salt transport flux increases less at the entrance after riverbed cutting and increases more in the upstream direction. During the spring tide，the advection transport and steady shear transport are mainly controlled by the upstream discharge at the main station to adjust the salt transport flux. During the neap tide，the tidal oscillatory transport for tide pumping is relatively large. The impact of sea-level rise on tide-dominated outlets （e.g. Hongqimen） is greater than that of river-dominated outlets （e.g. Modaomen），but the impact of sea-level rise in the short term is relatively small.

Abstract:Regular inspection of the appearance of underwater structure is an important prerequisite for the smooth operation of a wharf. By the analysis of existing inspection methods，we find that the poor image quality is the main limitation of the application of the visual techniques in the appearance inspection of underwater structure. Combining with the requirement of inspecting underwater structure，we innovatively integrated the artificial multi-underexposure fusion strategy with the color channel compensation method，and verify the visual quality of the underwater image of the image enhancement method by test. The results show that the multi-exposure fusion and color compensation can effectively enhance contrast，recover details，and correct color-cast of the underwater image with high computation efficiency. The image enhancement method can improve the visual quality of underwater images，and help engineers recognize the existing deficiencies of the wharf in time. The number of the matched pairs of SIFT feature points indicates that the proposed algorithm is also beneficial to the subsequent research of automatic deficiency recognition and measurement.

Abstract:In waterway regulation engineering，the cement mixing pile is affected by the flood season and the inspection period is relatively short. The currently commonly used static load test method and borehole core method cannot achieve the purpose of rapid inspection. Relying on a waterway regulation engineering in the lower reaches of the Yangtze River，we carry out the field standard penetration test and the indoor unconfined compressive strength test，establish a calculation formula based on the numbers of standard penetration and pile strength under different soil condition，and establish the relationship formula between different standard penetration numbers based on the growth law of cement soil age. The test results show that the standard penetration number of cement mixing pile and the unconfined compressive strength has a good linear relationship，and its linear parameters are closely related to the soil properties. The strength of the pile can be obtained through in-situ standard penetration tests to improve detection efficiency. The relationship between 7 d and 28 d standard penetration numbers is linear as N28=1.12N7+13. The relationship between 7 d and 90 d standard penetration numbers is the quadratic function as N90=-0.16N27+7.9N7-30. These formulas can predict the construction quality of cement mixing piles in the early-stage and accelerate the progress.

Abstract:In response to the impact of 400，000 DWT large ore ships from Vale Brazil on China’s coastal port transportation market，the government issued relevant documents in 2015，clarified the current “Four Ports and Seven Berths” 400，000 DWT iron ore terminal layout plan，which effectively guided the terminals’ operations and berthing management. In the new era，with the increasing capacity of 400，000 DWT ships on the route from Brazil to China and the further adjustment of the domestic coastal iron and steel industry structure，it is urgent to study the adjustment of the 400，000 DWT ore ship unloading port plan. This article summarizes the terminal construction and operation of the original layout plan，analyzes the trend of future shipping market changes，and proposes that based on the systematic analysis of port resource conditions and the actual situation of planning and construction，we shall take regional foreign trade iron ore unloading needs into account to encrypt Shandong’s coastal layout reasonably and fill the gaps in the southern layout，and finally form a new layout plan for 400，000 DWT ore terminals in coastal ports to meet the urgent needs of the national steel industry layout and regional transportation.

Abstract:Scour caused by ship propeller jets is one of the major concerns of open quay structures. The current domestic port and waterway engineering specifications do not involve the calculation of the relevant flow velocity and the design of the stability of the anti-scour protective block stone. Domestic researches related to ship propeller scour are mainly for solid vertical quay structures，but research on open quay structures scour problem is rare. By analyzing the research results of foreign specifications and propeller jets，and taking the calculation of the anti-scouring block size of an LNG terminal as an example，the anti-scouring design method of the permeable wharf under the action of the ship′s main propeller and lateral thruster are summarized，which provides the basis for similar projects.

Abstract:Based on the analysis of the arrangements of current inland berths of China，this paper puts forward a new layout of the inland compound harbor basin，in which the ships’ turning area will not occupy the main channel，and the layout of the berths are compact. We may build this new compound harbor basin，especially in the situation that the land width is limited，the number of berths is large，and the main channel is busy. Compared with the arrangements of current inland berths，the new compound harbor basin has more advantages，which may serve as a reference for the site selection.

Abstract:Aiming at the situation that there is still no applicable calculation method for different types and total anchorage number of seaport，and based on the investigation of the domestic coastal port use and management departments，and existing standards and relevant data are collected，this paper mainly analyzes the scope of application and existing problems and limits of different existing calculation methods. And the calculation methods for different types of anchorage numbers are put forward，such as piloting，anchorage waiting for tidal window，lying anchorage，emergency anchorage，inspection and quarantine anchorage，lighterage anchorage，and sheltered anchorage. In consideration of common usage among those types of anchorages and that ships would be cleared out before gale weather，it should be better to choose a larger value between sheltered anchorage numbers and the other anchorage numbers. The calculation results are testified appropriate for practical cases，which could provide a reference for the calculation of the number of anchorages of seaport.

Abstract:The commonly used wharf top elevation calculation methods and the two-dimensional extreme value distribution in international engineering are introduced，and that the main variables considered in the wharf top elevation calculation are wave height and water level is pointed out. Taking the Guinea bauxite export project as an example，the definition of the wave crest height’s return period is proposed. The extreme value distribution theory is adopted to fit the water level and wave height respectively，and the appropriate joint extreme value distribution model of water level and wave height is selected. From the comparative analysis of the calculation results of the case，it can be found that the concept of the return period of the wave crest surface height is introduced，and the wharf top elevation calculated by the joint extreme value distribution of water level and wave height is lower than the wharf top elevation calculated by the two separate one-dimensional extreme value distributions. In the area where wave force is non-dominant，the conclusion benefits the EPC contractor by reducing the project cost and improving its performance ability.

Abstract:In the design of the LNG terminal，the design of the breasting dolphin location is most important. Generally，the breasting dolphin location is designed based on the coefficient requirement in the relevant standards. But it is not suitable for all LNG vessels. Therefore，the paper researches on the compatibility of breasting dolphins to various LNG vessels. Analyzing the storage capacity，tanker type，and appearance characteristics of the LNG vessel，introducing the berthing guidelines for the LNG vessel，and expounding the arrangement of the breasting dolphin based on an overseas 10，000～220，000 m3 LNG vessels project，we conclusde that the suitable breasting dolphin location isn’t symmetrical about the working platform and the distance between the working platform and breasting dolphin at stern should be increased properly.

Abstract:Taking a wharf reconstruction project in Ningbo as an example，we adopt the Optimoor mathematical model to carry out the mooring analysis of various working conditions of different ship types in loading and unloading operations and mooring operations under extreme conditions in each operation area. Using the terminal operation standards，we determine the mooring rope material，quantity，and safe working strength of different ship types，design the comprehensive calculation work conditions，conduct the numerous trial calculation adjustments considering the mooring requirements for different ships，and acquire the results that meet the mooring requirements. We focus on comparative analysis of the line force distribution and motion characteristics of ship berthing at the long platform wharf in the center and eccentric mooring and propose feasible solutions to short cross lines or no cross lines for medium-sized ships and inadequate mooring equipment for small-sized ships. We determine the selection and arrangement of quick-release hook and bollard based on the analysis results and provide the schematic diagrams of mooring lines as a reference for the safe operation of the wharf.

Abstract:As a national key water transport engineering during the 13th Five Year Plan period，the first phase of the South Passage navigation channel regulation project in the Yangtze Estuary was completed and put into trial operation in June 2020. Based on the analysis of the field data of the capital dredging project of the South Passage 6 m navigation channel，the expected effect is achieved in the process of implementation，and the five main characteristics are as follows：1）The dredging construction scheme is reasonable and feasible，and the amount of dredging engineering in the capital construction period is consistent with the design expectation. 2）The new navigation channel scale is dredged on schedule，and the grooving effect is different along the waterway. 3）The management and control of the dredging construction process are standardized，and the various construction difficulties including high navigation density in the operation water area are overcome. 4）The dredged material is disposed in compliance with the regulations，and part of the dredged material is used as the bagged sand filling materials of regulation buildings，which make up for the short-term shortage of engineering sand. 5）the 5.5m temporary navigation channel of the South Passage is dredged in time，which ensures the navigation safety of ships during the construction period. Meanwhile，the key points of operation and maintenance management of the South Passage 6 m navigation channel and the assumption of further development of the waterway are expected.

Abstract:The channel from Hengli to Likou in the middle reaches of the Dongjiang River is continuously shallowing and needs to be regulated. Meanwhile，this section undertakes the task of sand mining. To explore the feasibility of sand mining in the river reach under the background of the implementation of waterway expansion and upgrading project，the depth integral hydrodynamics numerical experiment is used to study the changes in water depth，velocity，and water surface profile of the reach after the implementation of the channel improvement plan and the sand mining plan at the same time. Thus the regulation scheme is adjusted combined with feedback information. The results show that the implementation of sand mining planning after waterway regulation will directly lead to the monotonous decline of upstream water level and the deterioration of water flow in the channel. So a new round of regulation must be carried out to meet the navigation requirements. On the whole，the 13th five-year plan for sand mining can be realized in combination with waterway regulation. However，in the future，under the premise of ensuring the waterway transportation capacity of the channel，the Dongjiang River reach has no objective condition for planing sand mining projects.

Abstract:The tributary entrance of tidal reach is affected by the tidal action. Due to abrupt change of the local junction building section，a variety of adverse flow patterns are produced during high-intensity water diversion at low tide，which seriously decreases the flow capacity of the lock gate. Taking the Jiepai Junction of the Xinmeng River as an example，we carry out the physical model optimization experiment of local flow condition，and propose the scheme of regulation measures of the different barrier wall lengths and diversion pie forms. The results show that the extension of the barrier wall can only advance the backflow position and increase the backflow length，but it has no obvious effect on the flow pattern of entering the lock. The parallel arrangement of the diversion pier can make the flow zones of each pier non-overlapping and connect well. The scheme of 10 m extending of the inner left pier leads to a more uniform flow velocity distribution.

Abstract:Aiming at the problem of the regulation project of estuary channel of Chaohu Lake in the Yangtze River to Huaihe River project，we adopt the software of MIKE3 to establish a three-dimensional numerical model of the wave and sediment in Chaohu Lake，and study the effects of wave characteristics and sediment movement on the sedimentation of estuary channel in Chaohu Lake combining with the on-site observation data of the lake flow，wave and sediment. We analyze the wave characteristics of Chaohu Lake and the response relationship between wind speed and wave height of Baishitian River and Mawei River estuary channel，the response relationship between effective wave height and bottom shear stress，and discuss and analyze the influence of Chaohu Lake sediment transport on the estuary channel under wave and lake flow. The results show that the wave characteristics of Chaohu Lake are closely related to its wind conditions，and the nearshore sediment mainly moves in the form of “lifting the sand by waves and transporting the sand by lake flow”，which will have a direct influence on the deposition of Chaohu Lake estuary channel.

Abstract:Taking the ship lock of the Panghai junction in Guizhou province as an example，this paper uses the gray system theory to verify the filling and emptying system selection and layout based on the comprehensive analysis of the built ship locks in China. The physical model test conducts an experimental study on the hydraulic characteristics of the ship lock and the valve operating conditions. The berthing conditions and valve opening methods in the lock room were tested and determined，and the lock structure and filling and emptying system layout were determined and optimized. Combining ship lock filling and emptying system design and engineering practical experience and results of recent years，we provide a reference for the design and application of the second type of decentralized filling and emptying system and flat valve in the middle and high head ship lock project.

Abstract:The river section at the dam site of the Quanmutang Junction is an“S”sharp bend. The upstream entrance area is located on the concave bank of the narrow bend，and the downstream approach channel entrance area is at the turning point of the curved river section. The flow conditions in the entrance area and the connecting section are complicated under the influence of serious oblique flow and backflow，and it is difficult to meet the navigation requirements. The main reasons for the formation of unfavorable flow conditions in the upstream and downstream channels are studied by a model of scale 1∶100. The velocity of cross-flow and backflow is effectively reduced by comprehensive measures such as the adjustment of the upstream route，the arrangement of the dividing wall，the local dredging，and the downstream diamond-shaped pier structure. Flow conditions both in the upstream and downstream approach channels and the entrance area are greatly improved. Hydraulic indicators meet the requirements of the navigation specification，which can ensure the safety of ships.

Abstract:Judging from the actual situation for many years，the scour and deposition of the reach of the Yangtze River from Yibin to Chongqing is relatively balanced，and the replenishment of sand and gravel is very small and slow compared with sand mining. So it is bound to cause longitudinal and lateral deformation of the riverbed，thus changing the river regime and causing changes in the flow conditions of the waterway. Based on the measured data，the characteristic parameters of the beach failure zone in the reach of the Yangtze River from Yibin to Chongqing are obtained. Through mathematical model calculation，and combined with the measured topography and water level data of typical beach dangers，the analysis shows that：the current disorderly sand mining pits have reduced the water level to a certain extent near the Zengbingqi river section and part of the navigating water gauge during the dry season，which has brought some difficulties to the waterway maintenance department and ship navigation. This issue needs to be studied and paid attention to.

Abstract:The Cao’e River gate has been in operation since the end of 2008. The gate is normally closed for storage and opened for drainage during flood seasons. The river channel on the gate has changed from “scouring during the flood and silting during tide”to “single-direction scouring”，and the riverbed has undergone a large change. In this river environment，one of the most important restricting factors for the bridge construction is the navigable flow conditions，which are mainly the river regime，flow velocity and flow pattern conditions of the project reach，and the influence of the bridge construction. In this paper，the current situation and trend of the river regime of the project reach are analyzed based on the topography of many years after the gate was built，and the flow velocity in the channel is calculated and analyzed by establishing a plane two-dimensional mathematical model. The study shows that：1）Without the interference of large human activities，the river regime of the project reach is stable and the pattern of the beach channel will not change. 2）The flow velocity pattern meets the navigation requirements under the navigation high water level，and the construction of the bridge will have little impact on the channel . Therefore，it is feasible to build bridges in this reach.

Abstract:Mountainous rivers have the characteristics of rapid flow and large variation of flow & water level，which often lead to instability，displacement，and drift damage of the beacon vessel，becoming a threat to the beacon vessel. Selecting the typical accident section of the upper reaches of the Yangtze River，we carry out the experimental study on the instability mechanism of the beacon vessel and anchor stone system from the aspects of the water-resistance area of anchor stone，the weight of anchor stone，water depth，velocity，and cable angle. The results show that from the perspective of the anchor stone’s shape，the flat anchor stone has the advantages of low gravity center，large bottom area，and small water-resistance area，and has better stability and ultimate tension than the square anchor stone of the same weight. From water flow and ropes，with the increase of Froude number and cable angle，the stability of the beacon vessel and anchor stone system is worse. The smaller cable angle will lead to better stability. The empirical formulae between the ultimate tension，water depth，velocity，and cable angle are presented，which provide theoretical support for the layout of the river beacon vessel and anchor stone system of mountainous rives.

Abstract:A landslide will occur when the channel is scoured by the ship’s waves or in the process of widening. Based on the DP yield criterion and the ideal elastoplastic theory，the relation of the soil between strain and stress is derived. On this basis，the accumulation shape of landslide bodies with different cross-section ratios is studied by the SPH method. Two dimensionless parameters are used to describe the characteristics in the height and length directions，and the accuracy is tested by compared with experimental formal. The influence of height-length ratio on the contour of soil body is studied under the same cross-sectional area condition. The research results show that：1）The dimensionless parameters under the description framework used here are in good agreement with the computational values in the literature.2）With the increase of the height-length ratio，the yield zone of the slope will be larger，but there is not much difference in the outline of the landslide body.

Abstract:To accurately detect the damage for transverse guiding equipment of gear rack climbing type ship lift，considering the natural frequency change rate，stress，and strain as input characteristic parameters，we propose a structural damage detection model combining with the damaged structure classifier，damaged location classifier，and damaged level classifier. Taking Xiangjiaba ship lift as an example，we carry out the modal analysis and static analysis under 18 damage conditions to obtain 1，646 training samples and 100 testing samples. The structural damage detection model for the transverse guiding equipment was trained and tested based on the BP neural network，support vector machine （SVM） and Bayesian. The result demonstrated that the accuracy of the model based on the BP neural network for the damaged structure，damaged location，and damaged level are 93%，90%，and 91% respectively，which was 7% and 13% higher respectively than that based on SVM and Bayesian. The model was effective for the damage detection of the transverse guiding equipment.

Abstract:To study the influence of the upstream hydro-junctions on the navigable discharge of the Minjiang channel，especially on the discharge in the dry season，taking Gaochang hydrological station as the base station，and Pengshan and Wutongqiao hydrological stations as reference stations，using the statistical analysis method，we analyze the characteristic flow and inter-annual variation trend of each hydrological station in the Minjiang River，which generally reflects the inter-annual variation characteristics of the average annual flow，the average flow from January to March and the guaranteed rate of 95%. After that，we analyze quantitatively the influence of the Zipingpu hydro-unction and Pubugou hydro-junction on the discharge and water level of the Minjiang channel using the three discharge series of the Gaochang hydrologic station. Finally，we put forward the suggestion of the minimum navigable discharge in the regulation design of this section. The results show that the operation of hydro-junctions in the upper reaches of the Minjiang River can increase the flow during the dry season. The average flow from January to March and the flow with the guaranteed rate of 95% of each hydrological station in the mainstream of the Minjiang River all show an increasing trend. The discharge of the Gaochang hydrological station with the guaranteed rate of 95% increases by 93 m3/s after Zipingpu cascade impoundment and increases by 265 m3/s after cascade impoundment. Under the influence of the two hydro-junctions，the discharge increases by 358 m3/s totally，and the water level with the guaranteed rate of 95% increases by 0.43 m. Pubugou hydro-junction has a more significant influence on the navigable discharge of the lower reaches of the Minjiang River.

Abstract:In order to further deepen the relevant research on the bearing capacity of the Yangtze River channel and explore the improvement potential of the channel，we combine with the concept of ecological，economic，water resources allocation and flood control multi-objective coordination of the channel bearing capacity，take Guangyangba waterway of the upper reaches of the Yangtze River as an example，combine with the channel characteristics and the mutual adaptation mechanism of influencing factors，target selection of the evaluation indicators，preliminarily construct the channel bearing capacity evaluation model system of Guangyangba waterway，and analyze and calculate the comprehensive channel bearing capacity under the channel depths of 3.5 m，4.5 m and 6.0 m. The results show that the bearing capacity is the best under the 6.0 m channel depth. Guangyangba waterway has a certain amount of depth for improvement after comprehensively considering the influence of the above targets.

Abstract:With the implementation of large-scale reclamation projects and bank-protection works in recent years，the boundary of North Branch of the Yangtze Estuary gradually maintains stable. In general，the North Branch slowly undergoes sedimentation，but the remarkable channel evolution still occurs in some local regions with its complex navigation conditions. Based on the topographic data，we analyze the characteristics of channel evolution and navigation-obstruction of the North Branch since 1997，and propose the regulation idea of “linkage regulation and hierarchical navigation” in the upper，middle，and lower reaches of the North Branch channel. The water-depth of the upper reach of Chongqi Bridge mostly ranges from 3 m to 5 m，with the groove deeper than 3 m only being interrupted near Chongtou. It is suggested to arrange the channel with natural depth in the upper reach，and dredge in some shallow areas. The lower reach of Chongqi Bridge is widened，with the water-width from 5 km to 10 km. Also，the floodplain flow increases because of the erosion and shrink of the central bar，and it is not conducive to the maintenance of channel depth. It is suggested that the regulation works should be taken on the south bank，and the protection project of the central bar is carried out to stabilize the channel boundary and maintain the channel depth.

Abstract:Aiming at the difficulty of demonstrating the construction scale of construction temporary channel under the environment of the complex interaction between dredgers and merchant ships in the course of waterway construction，we apply the computer simulation research method，establish a temporary channel simulation model based on the Flexsim simulation platform combining with engineering cases，simulate the entire process of channel dredging and reclamation works，and analyze the influence of construction scale of the temporary channel on the schedule through model experiments. The results show that the construction scale has a limited influence on the schedule for the construction temporary channel with a short length and low density of ship flow，and the scale of mud storage area and reclamation station is also an important factor in the schedule.

Abstract:The channel regulation project has the characteristics of long coastline，large terrain change，many structures involved，and complex construction factors. There are some problems such as inaccurate engineering measurement，uncertain technical information，and redundant modeling of BIM. To solve the problem of creating a BIM model under complex working conditions of waterway engineering，relying on the waterway improvement project at the entrance channel from the Grand Canal to the Yangtze River，and based on the Autodesk platform，using Civil 3D，Revit，subassembly composer，and Dynamo visual programming，we research the application of BIM technology in waterway regulation engineering，realize the creation and editing of terrain surface，3D waterway model，and bank protection model creation，compare the method of bank protection creation，and form the application process of BIM technology in the waterway regulation process，hoping to provide references for the construction of similar projects.

Abstract:The traditional BIM software has deficiencies such as high cost，low efficiency，long installation time，and unavailability for mobile devices. Considering that cloud services are characterized by on-demand service，flexible usage mode，and high resource utilization rate，an attempt is made to combine BIM software with SaaS cloud services，and a Revit-based BIM cloud service construction method is proposed. By comprehensive application of Revit software development，document database，message queue，and other information technologies，the BIM cloud service for rebar application in port engineering is built，and the application verification is carried out in a wharf engineering project. The results show that this method can provide some functions of Revit software to users in the form of cloud service，expanding the usage mode of BIM software，and providing a reference for the construction of similar BIM software cloud service.

Abstract:Aiming at improving the level of refined design of geotechnical investigation of water transportation engineering，the research of development and application of geological 3D design system based on BIM technology in water transportation engineering is carried out. MR-GEO system based on MicroStation platform with the professional toolset and resource database is developed，which realizes the processing of interface data，generation of the 3D geological model with geotechnical information，drawing output，calculation，and analysis of results and other main functions. With the application in the project case，the system gets verified，which provides a reference for similar engineering requirements.

Abstract:There are some problems in the traditional analysis of riverbed evolution，such as heavy workload，no professional auxiliary tools，low production efficiency，difficulty in collecting river bed topography data over the years，high cost of measured maps，and scarcity of moving bed evolution data. Aiming at the above problems，a set of professional methods suitable for river channel analysis is developed by using the secondary development technology of Civil 3D，which successfully realizes the functions of intelligent mapping of river bed evolution and intelligent calculation of scouring and silting amount. Through BIM + GIS river simulation analysis technology，the river performance rules are summarized，the regulation scheme layout is assisted，the rationality of design is verified，and the problem of difficulty in the layout of the movable bed waterway regulation plan is preliminarily solved. The analysis technology greatly improves productivity and provides references for similar projects.

Abstract:The ship locks undertake major tasks such as flood control and navigation. Traditional ship lock safety management methods are insufficient in real-time and intuitiveness，and there is an obvious lag in response to danger. So it is difficult to meet the requirements of modern ship lock operation and maintenance management. Based on the concept of the digital twin，this paper proposes to use big data，artificial intelligence，and other technologies to build smart solutions for ship lock safety management. On this basis，a smart ship lock safety management system based on digital twins is developed to improve the smart level of ship lock safety management.

Abstract:To solve high energy loss in the vacuum preloading drainage system，we propose an energy-storage vacuum preloading system and probe into the drainage consolidation and energy-saving efficiency via vacuum preloading experiments with a single drainage board. It is found that the volume of the vacuum chamber has some influence on the vacuum consolidation efficiency，and the influence on the surface layer is greater than that on the deep layer. The consolidation efficiency of the proposed vacuum preloading system has little difference from that of the conventional one. The energy consumption of the vacuum system is closely related to the vacuum chamber volume. For the vacuum pump with a power of 1.5 kW and a pumping rate of 7.2 m3/h，when the volume ratio of the vacuum chamber and pore in the soil is about 3‰，the energy consumption of the proposed system would be reduced by 50%. The larger the vacuum chamber volume is，the higher the energy-saving efficiency would be. This study can provide theoretical support for the reduction of high energy loss in the vacuum preloading system.

Abstract:Based on the design of the restraining rock socketed pile of floating regasification unit，we provide an insight into various horizontal layered concrete-filled steel tube composite section parameters and stiffness calculation，introduce the recognized 〖WTB1X〗P-Y〖WTBZ〗 curves for the cyclic load type and rock，and establish simulation models for the P-Y curve using software ANSYS. Furthermore，we probe into the effects of the ground model，P-Y curves for the static and cyclic load type，rock socketed depth，lateral force application level，and uniaxial compressive strength of rock on the internal force of restraining rock socketed pile. The research results may serve as a reference basis for the design and execution of the restraining rock socketed pile of floating regasification unit.

Abstract:The permeability coefficient of sand soil can be reduced by mixing mud，bentonite，and cement，meanwhile the mix proportion meeting the permeability requirements of the sealing wall can be obtained by the indoor mix proportion test. Based on the theory of average permeability coefficient of layered soil，the theory of permeability coefficient of the sand sealing wall is established. The permeability coefficient of the mixed soil is controlled by the permeability coefficient and thickness of the fine-grained soil. The permeability coefficient of the mixture is mainly changed by the water absorption and expansion of the bentonite，and the hydration reaction between cement and pore water in the soil mainly changes the permeability coefficient of the fine-grained soil. The results show that the thickness of fine-grained soil，the permeability coefficient of the mixture with bentonite，and the permeability coefficient of fine-grained soil mixed with cement can be calculated by the theory of permeability coefficient of sand sealing wall.

Abstract:The amount of excavation works on the rock slope of the Xindongmen Wharf Yard is large，and the excavation slope rate will have a greater impact on the project cost. In response to this problem，new slope ratio calculation formulas are explored based on the existing standard slope ratio. Compared with single lithologic quality classification （qualitative，RMR and BQ quantitative） and slope ratio method （classified value and fracture angle），the methods are innovatively proposed，such as the value of the shear strength gradient of a single lithology，the equivalent BQ quality classification of interbedded rock mass，and weighted thickness shear strength slope ratio method. And the on-site verification effect is better. It is concluded that：1）The slope ratio calculated by the formula method of shear strength slope ratio can make good use of rock mass self-stability，control slope safety，and optimize engineering quantity. 2）This method can provide a new idea for the quality classification and slope rate selection of similar interbedded rock mass slopes in the case of no weak outwardly inclined structural planes，insufficient groundwater，and non-stratified conditions.