Abstract:The characteristics of the sandy seabed greatly affect the interaction between waves and single-pile foundation structures，while simplifying the porous medium seabed into a rigid and impermeable solid seabed ignores the effect of the porous medium seabed on wave energy. This study investigates the effects of the porosity of the sandy seabed and the average particle size of the medium particles on the wave load on a single pile，and five wave channel experiments with different seabed characteristics are designed. The results show that under the same wave condition，the pore flow inside the sandy seabed structure has an attenuation effect on the wave energy. As the particle diameter increases，the wave energy attenuation becomes more obvious，and the wave load on the single pile is smaller. When the porosity of the seabed is small，the water flow inside the seabed structure is weak，and the porous structure has no obvious effect on wave energy dissipation. When the seabed porosity is further increased，the water flow within the seabed structure is enhanced，the porous structure has a significant effect on the energy dissipation of the wave，and the wave load on the single pile is significantly weakened.

Abstract:To improve the accuracy of biaxial bending member reinforcement design，we analyze the ultimate limit states capacity of the reinforced concrete arbitrary sections based on Eurocode 2，calculate the reinforced concrete normal section capacity with an efficient dynamic mesh update technique and a Gaussian integration method according to the segmented characteristics of stress-strain relationship of reinforced concrete materials，and write the related program. The compiled computer program can analyze the ultimate limit states capacity of reinforced concrete arbitrary sections，give three-dimensional envelope surface data，and analyze the feasibility of reinforcement in conjunction with the internal force results of the finite element full node. The results show that this method has fast calculation，high accuracy，and solves the problem of convenience and completeness with a single node result check.

Abstract:The cutter suction dredger uses a triangle broad fin anchor as the positioning anchor for sideway dredging. Aiming at the problem that the grasping force of the sideway anchor is limited under the soft soil，we carry out the force analysis of the sideway anchor by using the limit equilibrium principle of soil and establish the calculation method of the grasping force of the sideway anchor. Based on the calculation，the main factors affecting the grasping force of sideway anchor are the depth of anchor crown into the soil，the failure angle of soil wedge，and the angle of anchor rod. The results show that the deeper the anchor crown goes into the soil，the greater the anchor grasping force. The smaller the angle between the anchor rod and the horizontal plane，the greater the anchor grasping force. With the gradual increase of the failure angle of the soil wedge，the anchor grasping force first decreases and then increases. When the soil wedge failure angle is between 20° and 25°，the anchor grasping force is the smallest，and the anchor grasping force coefficient is about 14.

Abstract:For the difficulty of the traditional sounding method in shallow water areas，based on the composition and principle of the unmanned boat sounding system，we studied the influence of the attitude of the unmanned boat on the sounding，and the method of gross error detection and filtering of sounding data. The analysis shows that the influence of attitude in shallow water area on depth sounding is limited，and medium filtering method，weighted average method，and trend surface filtering method can be used to process the gross error of sounding data. Combined with the application of the actual project，it is proved that unmanned boat systems can meet the demand of shallow water channel surveys and the accuracy of sounding can meet the specification requirements，which can provide a reference for similar projects.

Abstract:For the problem that the detection accuracy of the concrete coating thickness in port and waterway engineering by the microscope and ultrasonic dry-film thickness gages cannot meet the accuracy requirements of relevant standards，we investigate the accuracy requirements of ultrasonic coating thickness gauge in relevant specifications at home and abroad，select two accuracy requirements of ±2 μm and ±5%，measure the thickness of standard samples with the actual thickness of 53 μm，129 μm，252 μm，492 μm and 2 349 μm，and analyze the relationship between measurement deviation and accuracy requirements. The results show that the accuracy of ± 5% is more suitable for the thickness detection of concrete coating in port and waterway engineering.

Abstract:X-shaped pile is a type of heterotypic pile with inverted arch curved surfaces. Compared with rectangular and circular piles with the same area of cross-section，X-shaped pile has a longer perimeter and larger inertia moment of the section，resulting in better mechanical properties. Based on the covered sheet pile wharf structure of 32# berth in Jingtang Port，we apply X-shaped piles to replace original rectangular covered piles and study the influence of X-shaped pile on the static behavior of wharf structures. The results show that at the same central distance between piles，the moment of the front wall reduces when replacing rectangular piles with X-sectional piles，and the maximum moment of front walls is similar for two types of models at the same net distance of 1.75 m between piles. Under the same load，the displacement of the front wall is greatly correlated with the central distance between piles but hardly affected by the shape effect of the X-type pile. In contrast，the displacement of the anchor wall is hardly influenced by these two factors. The soil arching effect is directly correlated with the central and net distance between piles. This effect greatly affects the moment of the front wall，the soil press on the front wall，and the moment of covered piles. At a central distance of 4.05 m or a net distance of 1.75 m between piles，a great improvement of internal force is obtained. X-shaped piles at this spacing can be used to replace normal rectangular piles for saving construction costs.

Abstract:With the increasing demand for LNG peak shaving，the FSRU terminal is favored as a flexible and effective solution. However，there is only one FSRU terminal in China and there are few relevant studies. We summarize the characteristics of the FSRU terminal，display systematically four types of FSRU terminal，apply a 170，000 m3 FSRU ship to compare with the layout of the conventional LNG terminal，and discuss the design points of the FSRU terminal. The results show that the advantages of the FSRU terminal have relatively easy site selection，short construction period，less construction investment，and flexible operation. The design points include determining the product requirements of the project，determining the FSRU ship parameters，the working platform，and the breasting dolphins and mooring dolphins design.

Abstract:There are more than 50 large-scale berths planned in the long-term of the northern waters of Zhoushan. The low port entry speed，long duration，specific tide，and berthing time windows are the key factors impacting the port navigation efficiency of large ships. Under the conditions of existing and short-term and long-term planned ports，based on the Arena simulation modeling method，a simulation model of large ships in and out of the port in the northern Zhoushan waters is constructed to quantitatively analyze the impact of large-scale berth planning at different stages on the navigation efficiency of ships. The results show that after the short-term and long-term planning，the flow of large ships will increase by 33% and 65% ，and the average waiting time of ships in the Huangze operation area will increase by about 10.5 hours compared with the current situation and that in the Xiaoyangshan operation area and the Molanghu operation area will increase by about 0.5 h and 2 h respectively，which has a limited impact on the overall navigation efficiency.

Abstract:Under an inland river environment，the corrosion of internal steel bars due to concrete carbonization is the primary cause for the durability failure of the port structure. To study the carbonation law of wharf pile foundation concrete under the effect of periodic fluctuation of water level in the inland reservoir，the accelerated carbonation test of concrete in general atmospheric environment and alternate dry-wet environment was carried out. Test results indicate that：1）The carbonization depth of concrete gradually increases with the increase of the carbonization time，and the carbonization rate slows down as the carbonization age increases. 2） Compared with the atmospheric environment，carbonation depth of concrete under the alternating action of a dry-wet cycle is smaller. Based on the carbonation depth model derived from Fick’s first law，through fitting and correction，a prediction model of concrete carbonation depth under an inland service environment is established and verified.Results show good consistency between the proposed model values and the tested values，which verifies the accuracy of the model. The research achievement can provide technical support for the operation，maintenance，and durability evaluation of the inland port terminal infrastructure.

Abstract:As a multi-axially symmetrical steel structure，steel pipe piles have stable performance and a relatively clear stress mechanisms. They are widely used in port engineering in China and foreign countries and are mainly used for the foundation structure of high-pile wharf and the main structure of sheet pile wharf. This article compares the calculation methods of the internal force of steel pipe piles in four domestic and foreign codes （Chinese standards，European standards，API，and AISC），to explores the differences among the four standard calculation methods，which provides a reference for the selection of internal force calculation methods of steel pipe piles in overseas projects. Finally，taking the high pile pier and abutment structure of a port as an example，the internal force of the steel pipe piles calculated by the four codes is compared. The results show that：1）The AISC code calculation result is the smallest，that is，it fully considers the performance of the structure. The result is safe. 2）The European standard calculation result is the largest and relatively conservative. 3）The calculation results of Chinese code and API standard are between AISC standard and European standard.

Abstract:To solve the problems of scattered existing land area layout，inadequate land use，and insufficient yard capacity of Ningbo Daxie CMICT，the study was conducted to optimize its land area layout to intensify land use and enhance the competitiveness and development potential of the terminal. Based on the research and analysis，we sort out the main problems in the current land area layout. Through the calculation and analysis of berth passing capacity and yard capacity，we reasonably determine the overall capacity scale of the terminal，which guides the adjustment and optimization of the land area layout. The evaluation of the optimization work conducted in terms of both land use and yard capacity reveals that good results are achieved. The study proposes a feasible idea for optimizing the land area layout of large container terminals，which can provide a reference for similar project studies.

Abstract:Based on the results of the durability test and evaluation of the old jetty，we study the upgrading of the suspended jetty with front sheet piled. Adopting the reinforcement measures such as removing and repairing the damaged concrete and cracks of the old jetty，strengthening the surface with carbon fiber fabric，and constructing cast-in-situ pile to replace class III pile foundation and connecting it with the old structure as a whole，and based on the characteristics of the piled jetty with front sheet pile，according to various factors such as the water depth，mooring facilities，service load，etc. after the upgrading and reconstruction，we upgrade the old 5，000 DWT jetty to 30，000 DWT by construction a new 10 m-wide rear platform to connect the old and new structures as a whole. The application of this technology may serve as a reference for similar upgrading projects.

Abstract:The periodical cutting location of Jingjiang beach in recent years and the cutting scale of the sand body and the scale of the downward-moving central bar are analyzed，and the time and discharge of 12 large-scale cuttings that occurred since 1966 are studied. The result shows that cutting may occur both in flood season and dry season，the cutting discharge during low tide in the flood season is between 38 700～54 100m3/s （47 000 m3/s average），and the cutting discharge during high tide in the dry season is between 11 800～23 700 m3/s （17 000 m3/s average）. We may strengthen the terrain observation when reaching the cutting discharge，predict the channel crossing time，and allocate the dredging equipment in advance to reduce the impact of siltation on channel operation，which is of great significance to the maintenance and dredging of the channel.

Abstract:The navigable buildings in Wujiang Silin Hub，which are suitable for class IV channel，can not meet the requirements of the annual freight volume of the crossing dam according to class III channel planning，so the Silin second-lane navigation building is proposed to be constructed. In view of the poor condition of navigable flow at the entrance of the approach channel and the connecting section of the proposed navigable buildings，we conduct normal physical model research. Using a combination of water flow test，real-time flow field measurement，and self-propelled remote control model，we study the navigable water flow conditions and model manipulation in the upstream and downstream approaches of the navigable building and the connecting section under different working conditions，and obtain the optimal layout and navigable flow rate of the entrance area through program optimization，and conclude that the optimal layout of the entrance area is the modified program 3 layout form，and the maximum navigable flow rate of the entrance area is recommended to be 1 793.8 m3/s，which solves the key problem of navigability in the entrance area of the navigable building.

Abstract:To study the relationship between the resistance of the submerged tooth spur dike and its backwater response，a method for calculating the drag coefficient of submerged tooth spur dike is established by using a combination of physical flume tests and theoretical analysis. The drag coefficient is mainly related to the dimensionless submergence degree and relative dam length. Furthermore，the method of conservation of momentum is used to construct the backwater prediction model of the submerged tooth spur dike which is related to the drag coefficient and backwater effect. The backwater prediction model is verified by the measured data，and the calculated results are in good agreement with the experimental data. The results can be used as a reference for the study of the drag and backwater effects of other types of spur dike or buildings involved.

Abstract:Aiming at the practical problem that the 1.6 m draught control standard of Silin and Shatuo ship lifts in Wujiang River leads to the low loading capacity of the ship，we conduct systematical prototype tests of the over-draught ship to enter and leave the chamber to demonstrate the feasibility of upgrading the draught standards for ships. The results show that the ship leaving the chamber is the control condition，the maximum sinkage of the ship with the draught of 2.0 m is measured as 16.46 cm，and the under-keel clearance is more than 30 cm. An improved prediction formula based on the actual ship’s test data can increase the prediction accuracy of the ship’s sinkage by more than double. According to the current water level coordination mechanism of the two ship lifts，the upstream and downstream water levels change within 10 cm，and the maximum draught of the ship could be increased to 2.0 m. It is recommended that the draught control standards could be carried out from 1.8 m to 2.0 m during the navigation trial period.

Abstract:Aiming at the engineering problems that there is large-scale back-flow whirlpool at the entrance of the upstream area in the hub ship lock on the curved reach and the oblique flow in the approach channel，we adopt the method of the whole normal hydraulic physical model tests，and research the influence of different dispatching mode of the discharge sluice on the navigation flow conditions of the upstream approach channel and entrance area of the convex-bank ship lock. The results show that the lock in the convex bank hub，discharge sluice opening the remote area at the entrance of the gateway of scheduling can effectively weaken the reflow scale and the intensity of the approach channel oblique flow to ensure navigation safety.

Abstract:The high head water-saving ship lock for tunnel scheme of the Yellow River-crossing engineering can arrange the scattered water-saving pools alternately on both sides of the deep foundation pit，and the backfill behind the lock chamber wall is low and the free height is large. For the problem of the baseplate’s excessive negative moment of the high water head water-saving ship lock chamber in the high-flow period，we propose an integral structure with top-pull high-strength wire rope，use the ABAQUS finite element software modeling analysis to conduct focused research on the function of wire rope in four working conditions of completion period，high water level period，low water level period and maintenance period，analyze the effect of wire rope diameter and pre-stress，and propose a pre-stress estimation method based on unit cable force effect. The results show that the wire rope mainly plays a role during the high-flow period，and the larger the diameter is，the more obvious the effect is. The function of the wire rope can be further enhanced by exerting the pre-stress. The pre-tress estimation formula proposed in this paper is reasonable and feasible.

Abstract:When the downstream navigable entrance area is located in a curved narrow channel section，the water depth of the river is relatively shallow and the navigational flow conditions are very complicated，which is not conducive to navigation. Relying on the second-line ship lock project of Jingnan junction，a series of experimental studies have been carried out on the navigational flow conditions of the multi-lane lock in the curved narrow channel using a 1：100 overall physical model. The results show that：1）The original junction layout plan has defects. The water flow conditions at the entrance of the downstream approach channel are easily affected by the water flow at the top of the bend，and the narrow cross-section leads to larger flow velocity. 2）At the same time，the separation dike’s elevation is so low that it will cause water flow to overturn the separation dike and produce chaotic flow. The following improvement measures are proposed：1）The elevation of the upstream separation dike should be increased to 33.46 m and the elevation of the downstream separation dike should be increased to 32.58 m. 2） It is recommended to add a partition wall，smoothen the shoreline，and excavate the riverbed. The research plan provides technical support for improving the navigable flow conditions of the second-line ship lock project of the Jingnan junction.

Abstract:The Taoyuan hydro-junction ship lock is located at the tail of the central bar. In the middle water period，the plunging flow is from both sides of the hydro-junction，which causes the problems of transverse current and sand deposition in the downstream approach channel and its entrance area of the ship lock. It is necessary to solve the problem through engineering measures. The fixed bed flow and fixed-bed sediment transport experiments are carried out to study the flow and sediment conditions in the navigation hindering reach under the different regulation work plans of the middle water period. The results show that：1） The left dredged area can effectively balance the lateral drainage effect caused by the right dredged area. The wider is the width of the left dredged，the smaller are the transverse current velocity and the volume of the sand deposition in the reach. Comparing to the vertical wall construction，the ramp-style gabion dam can effectively avoid the reverse current formed at the end of the dam，so it further reduces the transverse current velocity and the volume of the sand deposition in the reach in the middle water period. 2） A dredging area is arranged along the entrance area of the downstream approach channel and the left side of the connecting section. The dredging width is equal to 1.5 times the width of the approach channel，and the dredging bottom elevation is 26.44 m. At the same time，the slope-type gabion dam is used to extend the left guide wall by 200 m，which can better solve the navigation-obstructing problem in the middle water period.

Abstract:To study the mechanical characteristics of composite pile foundation at separated lock head，we establish a finite element model of composite pile foundation at separated lock head constructed on soft rock based on Jianzishan lock，analyze the deflections and deformations of the side piers，propose the simplification algorithm of pile top force，and research the influence factors of vertical load sharing ratio of soft rock ξV. The results show that the side pier is dominated by rigid body displacement，the lateral rotation and vertical axis torsion are the largest during the maintenance period，and the pile foundation layout should be dense outside and sparse inside. Because of the crushing zones，ξV is only 11.5%. The relation between ξV and replacement ratio may be approximated by a hyperbola，and the relation between ξV and the soft modulus by a power function. The smaller the pile spacing is，the higher the displacement rate，the higher the soft modulus，the smaller the pile-rock coefficient ratio，the higher ξV is. The consolidation grout treatment of the crushing zone can help increase the bearing capacity of the pile and improve ξV to 26.8% effectively.

Abstract:For the problem that the calculation formula of anti-overturning stability of concrete interlocking blocks does not consider the influence of water depth in the standard formula，the stress of concrete interlocking blocks underwater current is studied，and new calculation formula of anti-lifting stability of concrete interlocking blocks is obtained by theoretical deduction method，then the relevant parameters of the new formula are determined by combining mathematical model analysis. In the new formula，the influence of water depth is considered，and the critical current velocity at the edge of the soft mattress is replaced by the average current velocity of the critical section，which is more accurate than the standard formula. In this paper，new formulas and standard formulas are respectively adopted to calculate the anti-overturning stability of bottom protection soft mattresses of the Heishazhou channel regulation project Phase II. The analysis results show that the new formulas can better reflect the actual force of soft mattresses than the standard formulas. Engineering practice proves that the new formulas have better reliability and can be used for reference of similar projects.

Abstract:To choose the best channel regulation scheme of the Liantuo section of the Yangtze River，this paper analyzes the influential factors of channel regulation and constructs the regulation scheme evaluation index system：18 indexes from the aspects of construction condition，ecological impact，remediation effect，and economic effect are taken into consideration in this evaluation index system. Adopting the fuzzy comprehensive evaluation model based on the evaluation index system to evaluate and optimize the waterway regulation project scheme of the Liantuo section of the Yangtze River，this paper concludes that the scheme 1（reef explosion+slag removal+ deep-pool filling） has a high degree of affiliation and achieves a higher number of excellent indicators. Thus the scheme 1 is recommended as the better channel regulation scheme.

Abstract:The information model system is an important part of the research and application of BIM for port & waterway engineering. In order to solve the problems of model hierarchy disorder and difficult management in the application of BIM for port & waterway engineering throughout its life cycle，combining with the characteristics of the port & waterway engineering industry，this paper analyzes and studies the model system of port & waterway engineering BIM，puts forward the idea and specific method of building the model system for port & waterway engineering BIM in layers，and finally verifies the method of building the model system in layers based on the application of practical projects. The result shows that the hierarchical model system makes the hierarchical structure of the model clear and facilitates the standardized management and application of the information model.

Abstract:The construction of the national spatial planning system clearly requires that the technical standards of port planning and other related special planning should be connected to it and superimposed on the “one map” of national spatial planning. The traditional port planning dimension remains at the level of two-dimensional layout，and the means of multi-dimensional multi-source spatial information analysis is missing. The technical system of whole life cycle planning and management has not been established，and the level of spatial analysis and quantitative optimization is backward，which is difficult to adapt to the new requirements of the territorial spatial planning system. As a data model that integrates various information of engineering，BIM is a brand-new method involving planning，design，construction，and operation management. It is also an effective technical means that can solve the problems of overall planning and connection of land and space resources related planning. This article summarizes the application of BIM technology in the field of engineering at home and abroad，and points out the specific problems faced by the application of BIM technology in the field of port planning，such as the lack of application architecture，the lag in the development of spatial planning technology，and the need to improve the application standard system. The application direction of technology in port planning including promoting the integrated development of BIM+GIS，expanding the perspective of port planning scheme optimization，and effectively linking the detailed control results in related fields，etc.，is put forward to promote the application of BIM technology in the whole process of port engineering scheme optimization and scientific decision-making.

Abstract:Civil 3D，as a BIM design and application solution for the geotechnical investigation industry，has become one of the 3D geological modeling implementation technologies. Considering the different engineering geological characteristics of the overburden layer in port and waterway engineering prospecting area，the construction idea of “point-plane-volume”3D geological modeling is adopted，and the modeling methods of the single and complex overburden layer geological models are respectively proposed. Combined with a ship lock engineering case，through the overburden boundary line introduction，curved surface segmentation，curved surface enclosure，and other technologies，the 3D geological model of the site surface rock and soil is refined expressed，and the geological development and distribution of the overburden in the survey area are accurately and intuitively displayed. The research results have great practical significance for the subsequent geotechnical investigation BIM application，such as earthwork calculation，foundation pit excavation design，and so on.

Abstract:Efficient dredging is not only the goal that has been pursued in the process of dredging construction，but also a hot spot in research. Based on the control principle of intelligent dredging mode，this paper analyzes the construction data of the Binzhou Port project under the intelligent dredging mode of “Hangjun 6008” ship，establishes the capacity and control model，and further optimizes and calculates the capacity of this trailing suction hopper dredger in the Binzhou Port project. The results show that the productivity is affected and restricted by flow rate，slurry relative density，and pump characteristics. In the process of dredging，the intelligent dredging mode mainly depends on the cooperation between the AVC and the EPC. When the actual flow rate is higher than the （optimal） set value and other boundary conditions are invariant，the AVC will press down the visor to match the productivity of the drag head with the vacuum limit of the pump. When the pump limit reaches，the EPC reduces the flow rate by reducing the speed of the pump to achieve the optimal mixture speed.

Abstract:For the difficulties that BIM technology could not manage ribbon projects and present surrounding spatial informations of projects，BIM and GIS data characteristics are analyzed and the method of BIM and GIS integration by format conversion，coordinate transformation，and data correlation is proposed in this paper. The method is applied in the Qichun waterway & channel regulation project. The results show that the BIM and GIS integration method is feasible and implements the functions including integrated view，display，management，and analysis of BIM and GIS data. The research results solve the difficulties that BIM could not manage the wide ranges of projects and reflect the surrounding environments，so they are important technical supports for the application of BIM and GIS technology in channel regulation project.

Abstract:Aiming at the problems of traditional waterway regulation design，such as lack of professional auxiliary tools，low production efficiency，difficulty in the division of labor and cooperation，large error in drawing and engineering quantity calculation，difficulty in scheme change，and low level of informatization，we research improvement of the production efficiency and quality of design work. Adopting the method of secondary development of Civil 3D platform with C# language and SAC visualization program，we develop a set of professional software for waterway regulation design，which solves the problems of intelligent mapping calculation，riverbed evolution analysis，BIM + GIS synthesis，etc.，and greatly improves the productivity，optimizes the design process，changes the design focus，and improves the design quality.

Abstract:Landscape visualization is often used in project bidding，communication，presentation，promotion，etc.，and it is an essential part of the design process. The mobile application has been the most convenient and speedy way of communication in our life. It will have a significant impact when applying the landscape visualization method on the mobile applications for the design，construction，operation，and maintenance of engineering projects. Based on the Unreal Engine4 development platform and taking a BIM design project of a wharf as an example，we realize the landscape visualization application on android devices. A set of visualization processes and methods for the BIM design are summarized，which can be used in landscape demonstration，smart guide，emergency drill，and equipment maintenance of the project.

Abstract:Aiming at the problem that PHC pile fabricated by Chinese standard should be expressed by British Standard in Southeast Asia，based on general rules on a concrete structure in British standard，mechanical property calculation method of PHC pile in British standard is founded. The mechanical properties include material strength，prestress loss，axial allowable maximum working force，shear capacity，cracking bending moment，and ultimate bending moment，and these items are compared with the corresponding resuls in Chinese standards. The comparison shows that the British standard result is close in total prestress loss and effective stress in concrete，smaller in the allowable maximum working force，and larger in shear capacity，cracking bending moment，and ultimate bending moment. The result has provided reference to the application of PHC pile standards in the overseas areas.

Abstract:In recent years，Chinese enterprises have contracted many pile foundation projects of port and waterway in the“One Belt and One Road”countries，but due to the lack of understanding of foreign codes，it has brought some troubles for the pile integrity tests. Taking Chinese code Technical specification for testing and inspection of port and waterway engineering foundation， American codes ASTM （D5882，D4945，D6760，D7949），and European codes （EN1997，EN1536，EN12699）as examples，the differences of pile foundation integrity tests in port and waterway engineering according to the three sets of current codes in China，America，and Europe in terms are compared，and the main results include：1）The Chinese code specifies the proportion of integrity test and divides the integrity of pile into four levels. 2） The American codes include thermal analysis，which enriches the testing method. 3） The American codes are only specified how the tests are to be carried out，but generally are not specified how the test results are to be used. 4） The European codes only provide the method for integrity testing without specific provisions，and the use is generally according to the local national requirements.

Abstract:In order to adapt the construction condition of a long row of shore distance for cutter suction dredger，on the basis of the original high efficient and high-pressure dredge pump with three blades on 6 500 m3/h cutter suction dredger，ensuring the shape of impeller unchanged and capacity of impeller passage no decline，we design the axial plane and the shaft surface streamline of the impeller，propose the four twisted blades impeller，calculate the optimization for the blade wrap angle combining with numerical simulation，determine the blade angle as 138°，verify the hydraulic performance of the pump by comparing the test results with the simulation results through the model pump test，and predict the productivity and energy consumption under the condition of different soil，the different row of shore distance by comparing the new impeller with the original impeller with three blades. The results show that compared with the original impeller with three blades，the four blades dredge pump lifts up by more than 18 m，the highest water efficiency reaches 86%，and the through particle sizes of the two impellers are both 425 mm. With 0.2 mm fine sand，the productivity of the dredge pump increases by more than 9%，the row of shore distance increases by more than 14%，and the minimum energy consumption reduces by about 3.5%.

Abstract:In response to the adverse changes in the navigation channel of the project section during the bridge construction，we analyze the measured hydrology，topography，and channel maintenance before and after construction based on the construction of the main pier’s open caisson of Husutong Yangtze River Highway-Railway Bridge. The results show that caissons sand suction operation and riverbed scour are the direct reasons for the recent waterway siltation and substantial increase of maintenance in the Nantong channel. So，the adverse influence of the construction scheme on the channel shall be considered in advance in the early stage of the pier structure study.

Abstract:In the actual operation process，the dynamic characteristics of the cutter suction dredger （CSD） are very complicated，and many factors affect the production. It will consume much time if all these control factors participate in the output prediction. To train the network and predict the production in real-time，the PCA is utilized to these control factors. Then，the number of control factors is reduced according to the results. In the system simulation modeling，the whole control factors and reduced control factors are used separately as the input variables of the RBF neural network，and the production is used as the output variable to establish the prediction model of CSD’s production. The results show that the prediction model of production can be simplified and the computation time can be reduced while the input variables are reduced，and the prediction accuracy of the model can be maintained，providing real-time production reference for operators on the construction site.

Abstract:Rubble mound breakwater and vertical breakwater are the common forms for breakwater structures，and the cost of the project is the important factor to be considered in the structure selection when the two structures are used for comparison and selection in the design scheme. This paper combines with an actual engineering case，analyzes the impact on the project cost based on natural conditions，main material supply，construction difficulty degree，and construction period requirements. The results show that when the water depth is shallow and the stone source is abundant，the rubble mound breakwater has the advantage of lower construction cost. For the large water depth and special landscape requirements，vertical breakwater can be selected.