Abstract:To achieve the projected goal of extending a 12.5 m deep water channel upward from Taicang to Nantong, a regulation project on the key parts of Tongzhousha shoal is designed to improve its ability of navigation. The regulation project includes the construction of submerged dike and groin. To investigate the function of the groin and provide the scientific basis for its final design, a 2D hydrodynamic numerical model of Tongzhousha shoal reach based on SWEM2D model is established to study the variation of tidal current after completion of the regulation project. The results show that the first five groins at upper stream are mainly to consolidate the shoal as well as stabilize the channel, and the other three groins are mainly to divert the water and deepen the water depth. The regulation project including the submerged dike and groins is mainly to reduce the water distribution at Langshan shoal channel and increase the flow dynamics at the shallow section.

Abstract:The Fujiang sand shoal channel is located in the lower Yangtze River, which is one of the most dramatic changes and navigation obstruction channels in the lower Yangtze River. To meet the development requirement of riverside area and upstream port and the construction needs of extension upward the deep water channel, we analyze the evolution characteristics of the Fujiang sand shoal with relevant information, and get to know that the head of Fujiang sand shoal and the middle waterway of Rugao remain stable and slight erosion in recent years. The erosion and deposition of the head of Shuangjiang shoal has a greater impact on the north and middle of Fujiangsha waterway. The deep trench is instale, and the thalweg swings a large range area, which is the key part of the waterway regulation.

Abstract:This paper simulates the waves induced by the typhoon ‘Muifa’. With the driven wind conditions generated by incorporating the Jelenskin typhoon model and QSCAT/NCEP bended wind, a typhoon wave model along Jiangsu coast is developed based on the MIKE21 spectral wave model, and a comparative analysis of simulation results with and without the effect of tidal water level is conducted. The results show that, the simulation model used in this paper can reasonably reproduce the features of entire process in the development of typhoon waves, and the accuracy of typhoon waves can be improved by considering the change of tidal water level.

Abstract:On the basis of a physical model test, the paper describes the action on the head of a rubble mound breakwater exerted by the oblique random waves, analyzes how the shock wave-current happens, and finds out the influence scope and effects on the armor blocks. The results may serve as reference for similar project design.

Abstract:A 2D tidal current and sediment numerical model was established to simulate the flow field and the sediment concentration during the survey of disposing spoil in Lianyungang waterway. Based on the good certification, the law of the diffusion of the suspended sediment from dredged spoil disposing and its influence on the sediment concentration of nearby water area were studied in different cases. The result of the study showed that if two drag suction dredgers with 4 500 m3 tank volume disposed the dredged spoil at the mud dumping area simultaneously when the flow direction was bias to the nearby waterway, the suspended sediment would spread quickly along the flow direction, the high-concentration water would not last for long and covered a short distance, also it had little influence on the sediment concentration of nearby waterway.

Abstract:It is one of the most important steps in determining the value of model parameters in the analysis of the seawall settlement on the soft ground by numerical methods. Combining the seawall engineering data of the Donghai bridge, we analyze the parameter sensitivity of the modified Cambridge model in the calculation of seawall settlement. The results show that the slope of the initial compression curve λ and the slope of the failure curve M have the greatest influence on the seawall settlement. When the values of λ and M fluctuate in the range of ±20% , the changing rate of settlement also fluctuates in the range of ±20% .While the rebound slope κ、permeability coefficient k、Poisson’s ratio v and intercept ea have very little influence on seawall settlement. When these parameters fluctuate in the range of ±20%, the changing rate of final settlement only fluctuates in the range of ±1%. Besides, although permeability coefficient k can’t influence the final settlement, it has a great influence on the consolidation behavior of the foundation. As a result , in order to analyze the problem of seawall settlement more accurately , more attention should be paid on the values of λ, M and k.

Abstract:The encircled basin can break waves and reduce sands, but it is disadvantageous for the water exchange flux for the harbor. Based on the project of Xuwei harbor in Lianyungang, the semi-exchange period of the water body is simulated and calculated with a convection-diffusion model under the wave-current interaction.The improving measures and their effect for the water quality are also investigated. Results indicate that the hydrodynamic condition is the key factor influencing the semi-exchange period of the water body, including the effect of tidal type and the position of harbor basin. The effect of measures depends on the improvement degree of the hydrodynamic condition in the encircled harbor and the size of the water exchange capacity.

Abstract:To ensure the accuracy of sonar positioning in pipe sinking, we study the influence of environment factor on the positioning. Based on the analysis of the influence of temperature and salt on the sound ray curve,multi-path effect and turbid degree, we draw some conclusions for pipe sinking and connecting construction.

Abstract:There are a large number of confluences at the trunk line of the Yangtze River. In these confluences, flow movement and river bed scour and silting characteristics are extremely complex, and the navigation is more serious. Therefore, the ADV is used for bend type confluence to study characteristics of flow movement by model experimental research. Research results show that, the discharge ratio and the inflow angle that is between mainstream and branch are the main factors to effect characters of flow movement.The inflow angle is one of the main factors for determining the separation area of eddies, and the separation area of eddies increase gradually as the inflow angle and the discharge ratio increase.

Abstract:In order to study the characteristics of flow field in the process of wave impact, two-dimensional regular wave numerical models are established based on the software FLUENT. RANS equations are adopted. The standard k-ε equations are used to close the Reynolds equations. VOF method is used to reconstruct the free surface.Through three typical cases of wave slamming on open-piled structures, the models are verified by experimental data and the flow field under the structure is displayed visually. Then the parametric studies are carried out for different wave steepness, relative clearance and relative structure width. Furthermore, the relationship between the velocities of the water particle and the impact pressures is studied based on the probability analysis.

Abstract:Land reclamation and port construction have been conducted in our country. A kind of efficient treatment technique and construction process which suits to large volume reclamation foundation project needs to be explored. The “Pneumatic Flow Mixing Stabilized Soil Method” which is developed by Japan recently is a kind of efficient treatment technique which suits to the preparation, transmission, and reclamation of large volume stabilized soil. The application, construction equipment, and construction process of the“Pneumatic Flow Mixing Stabilized Soil Method”are introduced, and a kind of efficient treatment technique and construction process is proposed based on the “Pneumatic Flow Mixing Stabilized Soil”Method in Japan and the dredged clay treatment technique in China.

Abstract:By analyzing the current situation of resource saving in container port, this paper proposes the design philosophy of resource-saving container port. The resource factors of container port are analyzed focusing on the key aspects in the construction process of container port, critical innovative technology for resource saving is promoted actively, and the basic experience for the methods and ways of resource saving in the design stage of container port is put forward.

Abstract:The contrast calculation and statistic analysis in 18 cases of gravity wharf on the basis of current codes and the under-revision codes to anti-sliding and anti-overturn stability are carried out. The result reveals that the anti-sliding and anti-overturn stability calculated by the under-revision Design Code for Wharf Structure,which introduces the comprehensive resistance coefficient γR and adjusting structure coefficient γd, is almost the same as that calculated by the present code. Therefore, the revisions are feasible and reliable.

Abstract:Since the pile driving of standing-pile wharf often exerts much negative impact on the stability of dock slope, this paper studies the negative impact on the slope stability exerted by the excess pore water pressure, disturbance of soil, vibration and pile driving velocity, and puts forward the prevention measures for sliding caused by pile driving.

Abstract:In order to research the wharf structures deformation characteristics under water level cycles circulation in the mountain rivers, the paper relies on the first-stage project of Funing port in Yunnan Province and establishes a three-dimensional finite element model of the overhead sloping wharf. Based on the waterrock interaction, it mainly studies the overall deformation characteristics of overhead sloping wharf, the horizontal displacements of piles, the piles top settlements and the retaining wall instability mode under the water level cycles circulation. It also obtains the wharf structures deformation development trends, meanwhile, the paper predicts the failure modes and features of overhead sloping wharf under the action of water level changes. The results can provide a reference for further studying the interaction between wharf structures and bank slope located in the mountainous rivers and its time-varying characteristics.

Abstract:To minimize the total time in harbor and improve customer satisfaction, different levels of punishment for the delay completion tasks and the deviation from the optimal berthing position are considered. To make full use of quay crane resources, dynamic scheduling of quay crane is taken into account and combined with continuous berth allocation simultaneously. An integer programming model is established to minimize the penalty costs of delay completion tasks, deviating from the optimal berthing location and quay crane movement. Berthing schedule and specific quay crane assignment plan can be gained. Experiments are carried out to verify the model, which show that the proposed approach can improve the efficiency of container terminals and the satisfaction of ship companies.

Abstract:Based on the conditions of a 225 000 DWT cruise, we carry out tests on the impact energy of a moored ship under the action of the single wind and single wave, and under that of the combined wind and wave, study the influence on the impact energy under the action of the single wind and single wave and under that of the combined wind and wave by two different wind simulation methods, i.e. blower fan method and method of hanging weight. Test results show that the impact energy by the blower fan method is 17.4﹪ larger than that by method of hanging weight under the combined action of wind and wave. In addition, the wind load has a great impact on the impact energy under that of the combined wind and wave, the impact energy will increase rapidly as the wave height increases.

Abstract:In order to grasp the real working condition of existing pier structures, we need to carry out detection and evaluation on the safety, durability and usability of the structure. Based on the Detection and Assessment of Harbor and Marine Structures promulgated and the Guide of Port Wharf Structure Safety Detection and Assessment by the Ministry of Reansport, through reinforced concrete structures detection and assessment of one high-piled wharf in South China, we provide specific technical explanations to the contents, methods and principle procedures of the detection and assessment, the results of which may serve as reference for similar detection and assessment of harbor and marine structures promulgated.

Abstract:The optimization of the yard is an important issue of the coal terminal. The paper presents two new stockpiling strategies which can improve the stockpiling efficiency for the yard optimization, with the formal description of the system and gridding the continuous space of the yard, then establishes a mathematical model for the coal terminal of gridded yard. According to the modeling and simulation of discrete event systems, we establish the gridded simulation model of the logistics system of coal terminal. Combining with the emulation test of practical professional coal terminal, we study how the new optimized stockpiling strategy affect the terminal’s operation. Meanwhile, we validate the novel optimized stockpiling strategy of engineering applicability.

Abstract:Due to Yangtze Estuary Deepwater Channel Regulation Project with 40 years of research and 13 years of construction, the 12.5-meter-deep waterway was officially navigational in May 2011, and thus the pattern of Yangtze estuary waterway system had a historic change and stepped into the period of post 12.5-meter navigation channel. Based on analysis of current situation and problems of Yangtze estuary waterway, various kinds of opportunities and challenges of Yangtze estuary waterway in the period of post 12.5-meter navigation channel are discussed, and relevant channel regulation measures are preliminarily presented.

Abstract:Goose-head inlet is one of typical bending bifurcated reaches of the middle and lower Yangtze River. Channel such as Yaojian, Luxikou , Luohuzhou watercourse belong to this type. Goose head inlet is usually characterized by multi-branch-state swing, beach volatile, air tank, and frequent channel change. To ensure smooth waterway and stable regime, we must regulate this type of channel. Based on relevant information, this paper analyzes variation characteristics and navigation-obstruction features of a goose head shaped inlet. Combining with several regulation works concerning goose-head bifurcated channel, this paper presents the regulation measures for the goose-head inlet channel.

Abstract:The planning on comprehensive utilization of Inland waterway’s shoreline involves both sides’ inland waterway ports, industry, integrated transport, urban development and comprehensive utilization of water resources planning. According to the characteristics of waterway network region, this paper puts forward the function classification of inland waterway’s shoreline, ideas and principles of shoreline utilization, as well as control requirements on various types of shorelines. Finally, as an example, the method is applied to the comprehensive utilization planning of inland waterway’s shoreline of Kunshan city.

Abstract:Based on the analysis of the data from physical model test and field observation, we study the reason, trend and detrimental effect of the change of river regime on the south channel recently and propose corresponding countermeasures. The results show that: 1) Due to the large-scale water conservancy engineering, an obvious adaptable adjustment of the river regime on the south channel is happening; 2) Without other engineering measures taken, the unfavorable influence due to the river regime’s variation of the south channel will exist for a long time; 3) The unfavorable influence can be controlled if we implement appropriate artificial engineering on Ruifengsha.

Abstract:According to current characteristics of navigation of the Yongjiang waterway and along the port, this paper analyzes the shipping status and development of Yongjiang river waterway systematically. On this basis, controlling elements of the research on sluices are studied through waterway status, and the impact on the regional shipping of the sluices is studied comprehensively and deeply. force and deformation of three types of cylindrical caissons based on a project example, and calculates the steel bars and the width of the crack, the results of which indicate that the internal force and deformation of cylindrical caissons without partition are the maximum, but in this project three types of cylindrical caissons all satisfy the requirements.It is recommended that in the design of cylindrical caissons, we shall take cylindrical caisson without partition into account firstly, and consider other types with partitions when it can’t satisfy the requirements.

Abstract:Based on the analysis of the water and sediment variation at Wuzhou station form 1955 to 2010 and the river bed deformation below Changzhou dam from 2002 to 2011, it is concluded that the runoff change was relatively stable, but the river sediment experienced three periods, and the sediment discharge and sediment concentration decreased sharply after 2003. Though the change happened before and after the construction of the Changzhou dam, the Changzhou dam was not the main reason for the decreased sediment concentration. And the dramatic deformation below Changzhou dam was more possibly caused by sand mining and channel regulation.

Abstract:The effect of river-crossing bridge on waterway upgrading is analyzed based on the construction of Xiangjiang river 2000 t downstream channel and a concept is proposed that for those bridges with insufficient clearance, treatment scheme which guarantees the navigation safety and also takes the economic feasibility of waterway upgrading into consideration, shall be determined by considering the days of navigation obstruction analyzed based on the existing ship-type and the difficulty of bridge reconstruction.

Abstract:This paper probes into the morphological characteristics of the wide, straight, curved and branched connection reach between the straight relaxing and bending braided part of the Yangtze river, analyzes the influential factors on the channel of the connection reach based on the example of a typical river reach, and puts forward the channel management ideas for the connection reach, i.e. fencing the low beach of the braided reach, limiting the lateral change of the river, firming the bottomland form of the braided entrance area, and shaping the connection reach into a smooth one with reasonable curvature in the dry season.

Abstract:The fluctuating backwater area under the dam of Beijiang Baishiyao water conservancy is an important navigation obstacle shoal to the middle of North River. Before waterway regulation engineering, the depth of waterway is shallow, so ships must reduce the load or delay sailing. Ship jam often occurs and water depth keeps only between 0.8~1.0 m. Even suspension of shipping occurs from time to time, so waterway regulation engineering is necessary. In order to achieve Class-III channels, this paper analyzes the characters of the evolution of these shoals, develops a river work model, takes full advantage of the regulating structures and makes the best use of the general trend, and takes appropriate measures to analyze the two waterway regulation schemes of Class - III channels, then proposes regulation scheme. According to the analysis result, it is feasible for the reach to achieve the waterway scale of 2.5 m×60 m.

Abstract:Remote sensing (RS), global positioning system (GPS), and geographic information system (GIS) can be applied to monitoring and analysis of waterway engineering projects. If the relative parts derived from these three separate techniques are combined efficiently, a powerful comprehensive technique system can be constructed to supply information on dynamic changes of riverside, beach, current and sediment of the Changjiang River. It can provide panoramic, multi-level, reliable, precise and real-time information for the development of the “golden waterway”, facilitating to understand speedily and accurately the impacts of the engineering project on the change of the river and to provide economic and reasonable river channel improving project. Meanwhile, the construction of a digital platform of information service, sharing the resources of general surveying, monitoring and analysis, is favorable for improving the Changjiang channels’ support capabilities and service quality. The platform will lay a solid foundation for the “digital waterway” and promote the development of Changjiang channel in a sound and rapid way.

Abstract:This paper studies the boundary conditions of interaction between the polar and the soil in sandy foundation soil, defined by the vertical beam on elastic foundation method and the imaginary fixing-points method. Based on a port project, using the structure analysis software SAP2000, we calculate, compare and analyze each pile’s ultimate resistance of the pile and settlement of wharf transverse bent to simulate pile-soil interaction. The result shows that in the sandy foundation soil (when piles are friction piles), the situation which adopts the results by the imaginary fixing-points method as the design basis can be very risky. Therefore, it is suggested to adopt the method of vertical beam on elastic foundation, which is much more reliable and stable.

Abstract:Based on the total stress method, a three-dimensional FEM numerical model of suction caissons in saturated soft clay is presented by the finite element analysis software ABAQUS. The numerical model is verified by the laboratory test results. In the numerical analysis, the load bearing characteristics, failure mechanism and the envelope diagram on the optimal mooring point are investigated. By fitting analysis of the numerical results, a simplified method for the estimation of the uplift capacity for suction caissons is described. The expressions developed in this paper take into account the influence of the aspect ratio of the caisson, angle of inclination of the loading and the undrained shear strength of the soil.

Abstract:The periodical reservoir operation leads to a great change of physical properties of soft rock, thus affects the long-term load-bearing capacity of a rock-socketed pile. This paper investigates the axial load bearing capacity of rock-socketed pile with physical models under four working conditions, and gets the characteristics of axial force, pile side friction and end resistance of piles socketed in weak rock. On the basis of test data, this paper also conducts a 3D elasto-plastic finite element analysis for the axial bearing capacity, shaft friction, and end resistance of the piles with different lengths and diameters under three working conditions, which can provide a thereoretical basis and a practical method for designing piles socketed in weak rock in inland river reservoirs.

Abstract:Based on vibration parameters of pile and projection pursuit method, this paper carries out a prediction analysis on the bearing capacity of pile. Taking the maximal value of impact pile driving force, the maximal energy value of pile transferred by hammer, the maximal dynamic displacement of pile peak, the maximal value of Zv, depth of pile in soil, pile diameter as independent variables, and bearing capacity of pile as dependent variable, the prediction model of bearing capacity based on projection pursuit method is obtained. It is found that, the relative error of prediction value (or fitting value)of bearing capacity of pile is ±0.071 83%compared with the observed value by dynamometry for 32 groups of independent variables training model, and the relative error were ±7.352 97%，±6.011 21% respectively compared with the observed value by static test and dynamometry for 6 groups of independent variables validating projection pursuit model. The following conclusion can be drawn that, the prediction model is accurate and credible, and the projection pursuit method is a better method, and it is worthy to spread its application in the prediction analysis of bearing capacity of pile.

Abstract:In the soft ground treatment by vacuum preloading, the horizontal and vertical influence scope caused by the vacuum preloading is essential to the soft ground treatment project. Based on the CSR rail vehicle maintenance-built base’s large area soft ground treatment project, according to the monitoring data of surface settlement, vacuum degree and pore water pressure of different depths in the loading area, as well as the surface settlement and horizontal displacement outside the loading area, we get the influence scope of soft ground treatment by vacuum preloading which can provide reliable data and serve as reference for the design and construction of similar projects in the Pearl river delta region.

Abstract:The overflow construction of the trailing hopper suction dredger is one of the important methods of construction, and the improvement of construction efficiency relates to the loading time. To determine the best loading time and production mode, we need to analyze the soil in the construction area, loading time, loading efficiency, drifting soil from the construction area, etc., and verify them by the engineering practice. The best loading time guarantees the construction efficiency and economic benefits.

Abstract:The Xinliuhe shoal protection project and Nanshatou channel submerged dike are very important parts of Yangtze estuary deepwater channel regulation project. With the adverse effect of river regime’s changes, the river bed outside the flexible mattress edge of the locally regulating structure keeps scouring deeper and deeper, which affects the safety of the structure. This protection is implemented to ensure the regulation effect. Based on the experience of Yangtze estuary deepwater channel regulation project, through water current analysis and typical constructions, we carried out a series of optimization and improvement in ship equipment, flexible mattress machining and construction technique, and filled sand bags and laid flexible mattress successfully over 30 m under the water for the first time in the Yangtze estuary, which met the design requirements.

Abstract:For the dry dock wall, which is made of the underground continuous wall or concrete sheet pile wall, cracks easily occur on its outside lining wall, which lead to water leakage, and even sand falling, and finally affect the function of the structure. Based on the actual engineering execution, thia paper analyzes the causes of cracks on the lining wall, and gives some advice on prevention and treatment of cracks on the lining wall.