Abstract:Based on the analysis of wave elements of waters around Dalian offshore airport artificial island,we carry out the physical model experiment on the wave overtopping of the artificial island’s retain wave wall with different wave directions using JONSWAP spectrum.The results show that,for the design retain wave wall section,the wave overtopping of different directions can meet the design requirements in the case of 100 a and 200 a of the wave return period under the extreme high water level.The experimental results provide a scientific basis for optimizing the artificial island revetment structure.

Abstract:The beneficial use of dredged materials started early in the developed countries such as the United States of America,European countries and Japan,and has accumulated rich experience.Taking the United Kingdom as an example,we analyze the current situation and characteristics of dredged materials’ disposal,summarize the main development of beneficial use of dredged materials in the United Kingdom from aspects of technology and policy,and put forward its enlightenment to China.The results show that it has dredged material management system with clear right and responsibility and professional studying agency for the beneficial use of dredged materials in the United Kingdom.A great attention is paid to the technical support and policy guidance for the beneficial use of dredged materials,and lots of typical and successful cases such as wetland restoration of Wallasea Island and sediment environment maintenance in the Thames Estuary are achieved during the past 20 years.Learning from the British experience,we realize that the work for the beneficial use of dredged materials in China should be focused on 3 aspects at present and during several years in the future,i.e.,the support from the government and the related party,establishment of professional administers and research institutions,and formulation of related policies and regulations.

Abstract:It is a convenient method to estimate design wave parameters utilizing the wind observation for wind wave factors in case there is no observed hydrologic data on the engineering site.Through two typical project cases in Ningbo-Zhoushan sea area,this paper calculates the wind wave factors by two principal means,i.e.national code method and Putian empirical method,and evaluates and compares the suitability and effectiveness of two formulas through combining three primary parameters into conditions (including fetch length,average depth and design wind speed),which can be used for reference in the engineering design.

Abstract:This paper studies the wave overtopping of reclamation engineering at the Yangtze River estuary with nonlinear shallow water equation SWASH model.In order to improve the dispersion of model,the vertical direction of model is divided into two layers,and the acceleration of vertical direction is considered.And then,the wave overtopping calculated by the sea embankment standard and SWASH model are compared to study the accuracy of the two ways.The results show that both the two ways can compute the wave overtopping exactly,and the result of model is more accurate.And,the impact of barrier board to wave overtoping should be considered in the numerical simulation.

Abstract:Based on the analysis of existing ships of Zhejiang inland waterway container transportation and researches on the present situation and development planning of the channel,bridge and navigation lock,this paper proposes the matching ships for developing Zhejiang inland waterway container transportation and analyzes its characteristics including energy saving,efficientness,economicalness and adaptability.The research has reference value for formulating relevant standards and also is of great significance to the development of Chinese inland waterway container transportation.

Abstract:This paper analyzes the sediment movement in Shicheng island waters in Zhuanghe,calculates the wave broken depth,sediment incipient motion depth and current velocity,demonstrates the dynamic causes for the deep trough of Shicheng island,and determines the principles for the general layout.Key parameters are analyzed for the layout of sand retainer jetty and border of land reclamation,and the siltation is discussed based on experience formula,numerical model and analogy of similar harbor sites.

Abstract:Based on the measured data,we study the hydrodynamic characteristics of Dushan shallows and evolution features of the shoreline.Based on the analysis of the survey data in sea bottom of 2005 and 2013,we study the erosion deposition variation of Dushan bank and changing trend of the deep groove during the past 3 years.The results show that the north of Hangzhou bay coastline tends to be stable,Dushan bank region bias deposition,and the deep groove tends to move outside.

Abstract:The destructive status of epoxy-coatings on rebar is investigated by the electrochemical spectroscopy.The results show that there is only one time constant while the epoxy-coatings are non-destructive.The time constant reflects the characteristics of epoxy-coatings.The resistance decreases and the capacity increases with the increase of time due to the water in concrete pore penetration into epoxy-coatings.There are two time constants while the epoxy-coatings are destructive.They reflect the characteristics of passive film and electrochemical reaction.The EIS could conveniently and quickly differentiate the destructive status of epoxy-coatings on rebar.It is a useful test method for in-situ and unwounded test the destructive status of epoxy-coatings on rebar in concrete structures.It provides technical support for nondestructive examination of epoxy-coating reinforcement in concrete structures.

Abstract:As a typical structure type of breakwaters,caisson breakwaters used to be constructed in the water area with good geologic conditions.With the extending of coastal structures to the offshore,deep-water and soft soil area,harsh ocean environment and soft geologic conditions put forward stronger requirements on the design theory and method of breakwater.Combining with the practical application,we firstly use the code method to compute the breakwater’s stability and get the most dangerous working condition;and then study the instability mechanism and failure modes by the finite element method under the conditions with and without shoulder stones.The results show that with the increase of wave force,when the cut-through plastic zone of soft clay foundation is formed,the caisson breakwater without shoulder stones slides first;the caisson breakwater with shoulder stone topples first,whose instability occurs in the form of rotation around a point below the bottom surface and on the right of the caisson axis,being different from the point of caisson hind toe in the code.

Abstract:In view that more and more high-pile wharves are constructed in the earthquake and deep water zones in some countries,the influence of hydrodynamic pressure on the dynamic performance of high-piled wharf in deep water become an urgent research subject.However，there are few research on the subject both at home and abroad,and it is lack of calculation method for the hydrodynamic pressure on high-piled wharf in deep water and earthquake zones.Based on the added water mass theory,p-y curve method is used to simulate the pile-soil interaction,and simplified Morison formula is adopted to calculate the hydrodynamic pressure.So the dynamic performance indicators are compared when the hydrodynamic pressure is considered or not,under the action of the earthquake.The results show that the hydrodynamic pressure not only has an impact on the vibration characteristics of the structure,but also has a greater impact on the structure’s dynamic performance.Therefore,the hydrodynamic pressure should be taken into consideration in the seismic design for the high-piled wharf in in deep water and earthquake zones.

Abstract:This paper studies a new-style breakwater with double-chambers and circular curved surface under the action of irregular waves,from both its hydraulic characteristics and the regulations of the wave pressure on different parts of the structure changing with different factors.Through the experiment,this paper concludes the optimum opening ratio and filling rate of the structure to provide a reference for practical engineering.

Abstract:Compared with the traditional slope revetment structure,the optimized inverted-L breast wall narrow-body revetment structure can reduce the engineering volume and save the engineering cost significantly.Two schemes are calculated and analyzed in the wave force and wave overtopping.By the physical model test,the optimized scheme can meet the requirements of the code and utilization in structure safety and overtopping,and thus may serve reference for the similar engineering.

Abstract:Two berths of Liaojiadang wharf locate in backwater variation zone of the Three Gorges reservoir in the Yangtze River,which are affected by the upstream stone beams in Kuzhubei,thus the water conditions are very complicated.On the basis of analysis of river bed evolution,water conditions and navigation conditions,we propose safety measures which limit ships to berth during different periods.The main research results are as follows:the channel of waterway of wharf project is stable;during the dry season,i.e.,from November to the end of April of the next year,when the Three Gorges reservoir runs in high water level manner,the water conditions of the wharf keeps feasible,it can berth 2 rows of ships at most;during other months,i.e.,from May to October,the water condition of the wharf runs in natural states,it can berth one row of ships at most;when floods occur,the flowing properties become deteriorated in rough 100 m range near the Kuzhubei site to affect the navigation of the Liaojiadang wharf,thus during floods months,i.e.,from June to September,the ships are prohibited at the upper berth of the wharf.

Abstract:The wave attenuation characteristics of typical perforated breakwater are researched based on practical engineering applying pile foundations and with wave walls and wave boards installed.Wave heights are measured to analyze the influence of structure forms on wave heights and propagation.Wave forces on superstructures are measured to analyze the influence of different forms of wave walls or boards on structure stress.At last,the correlation between wave height and structure stress,which are both influenced by structure forms,is studied.Results show that a reasonable design of superstructure could effectively reduce structure stress while fulfilling the need for wave attenuation.

Abstract:The vessel’s flexible berthing and crane’s dynamic scheduling is the main operation and management method of specialized container terminal in current years.According to the characteristics of this method,a simulation model of vessel’s flexible berthing and crane’s dynamic scheduling is built by AutoMod,in which a case study is made on the fourth phase of Shanghai Yangshan Deepwater Port.Through simulation and analysis,we get the evaluation data of the design,which offer reference for the decision-making.

Abstract:The transformation of old port has been a hot topic in urban development.Considering few researches on shoreline re-use,this paper presents a pattern of shoreline re-use covering project objective,principle,mode and function,with six function types and a function position frame included,and applies it to the transformation of Area 14 of Shanghai port,as reference for port redevelopment projects.

Abstract:The upper part of a pier wharf on the sea is usually made up of horizontal panel with both vertical and horizontal beams above the still water level.There have been quite a few theories and empirical studies that calculate the wave force on structures and propose many empirical equations concerning the wave force and corresponding pressure distribution.Nevertheless,due to the complex variables and changeable girder systems,it is necessary to determine the pop-up force and horizontal force on beam structures by physical model tests.The current study,by physical model tests,tests and calculates the wave force on the wharf platform,abutment and pile foundation under different situations of water level and waves at the petrochemical wharf,Haicang harbor,Xiamen.The test results have been adopted in practice by some design units.

Abstract:In the process of transformation from the traditional handling service to the comprehensive logistics service of the modern coal port,port overall scheduling requires more intelligent and efficient,so the coal port of joint scheduling optimization needs to be solved by the system theory.To counter the key problems affecting unloading scheduling,considering traffic concentration reached,train scheduling factors such as restriction,on the basis of modern coal port production process,focusing on the unloading joint scheduling optimization of modern coal ports,we build the model for the shortest waiting time,the shortest operation time,and the shortest dynamic operation time associated yard operation (the train-car dumper-yard joint scheduling optimization model).Using corresponding optimization strategy,we analyze the optimization model and realize the optimal intelligent unloading scheduling of each link.

Abstract:The basic situation and development trend of the car dumper system in coal ports of China and abroad are introduced.Combining with the engineering practice of quadruple car dumper,we describe the design and research process for the technological system of the large multi-functional car dumper,and a large-scale multi-function car dumper system developed which is capable of unloading four wagons in a dumping loop,and meet the demands of C64 uncouple wagon,C70A and C80 couple wagon,KM80 bottom wagon,etc.This system can satisfy the increasing coal production and meet the development demands of the car dumper system with the orientation of large-scale,efficientness,environmental protection,multi-function.

Abstract:The spur dike is a common structure controlling river flow in channel regulation,around which the flow is characterized by strong turbulence.Comparing with the time-averaged models based on Reynolds equation,the large eddy simulation (LES) has a stronger capability to perform the eddy.The sub-grid-scale (SGS) model,one of LES,is introduced into 2-D river flow model under the Cartesian coordinate to filter the governing equations utilizing the box filter method.The large eddy is computed directly,while the small one is computed with the SGS model by Smagorinsky.The square grid and ADI algorithm is used to discretize the governing equations.The application of the model to simulation of river circumfluence around a non-submerged spur dike shows that the calculated eddies and depth distribution of turbulent flow are in accordance with the observation data and the precision satisfies the engineering requirements.

Abstract:The sediment transport under unsteady flow in open channel is the basis of river sediment movement mechanics.Comparing the sediment data under unsteady flow both at home and abroad,we find that the researchers have not reached a consistent conclusion,which indicate that the unsteady flow and sediment is still in the starting stage.By defining a new unsteady factor,we integrate all the researchers’ data and find the universal rule concerning sediment transport of unsteady flow.

Abstract:With the unfavorable navigation condition and complicated sailing environment, phenomenon like waterway block arises frequently in Yanshao waterway of Yangzhou segment. This article analyzes the main reason of waterway block and puts forward some corresponding countermeasures and a joint simulation scheduling model of multi-bottleneck is established at the same time. Besides, scheduling rules for vessels and evaluation criteria for this model are introduced in this paper. Furthermore, this model simulates ship operation and studies the effects of the improvement measures on Yanshao waterway of Yangzhou segment. Results show that, Yanshao waterway of Yangzhou segment is a multi-bottleneck nodes channel, Yan lock is the most critical factor in determining the overall through capabilities of Yanshao waterway. Vessels overtaking in the same direction and encountering in different direction at nodes are the primary causes of waterway block in Yanshao waterway of Yangzhou segment; optimizing management of vessels passing lock can reduce the phenomenon of waterway block. Simulation results prove that the joint simulation scheduling model of multi-bottleneck can optimize the management of vessels in Yanshao waterway, the cost-time of vessels in Yanshao waterway is rarely decreased despite, but the risk of channel congestion is reduced effectively, the latter has more guiding significant for scheduling in Yanshao waterway.

Abstract:Located on the upper reaches of the Yangtze River and in the western center of the ‘Yangtze River Economic Zone’,Chongqing’s shipping advantages are obvious.So it is an important measure to speed up the national strategy of the construction and development of the shipping center on the upper reaches of the Yangtze River.This paper positions the development of the shipping center after summarizing five basic elements,and classifying 3 development patterns and 2 categories.The SWOT analysis is used to analyze the strengths,weaknesses,opportunities and threats and sets forth the development strategies.Finally,this paper points out that Chongqing should exploit the advantages to the full,and seize the rare opportunities of policy to develop the shipping center by improving shipping services gradually,stabilizing supply of goods,strengthening cooperation,and developing the comprehensive transport,etc.

Abstract:The regulation technology of complex rapids in the Yellow River of Ningxia autonomous region which is shallows,rapid,bending and dangerous is researched.Based on the analysis of the rapids’ characteristics,we propose four regulation design schemes which are optimized through comparison by physical model experiments.The results show that the best regulation scheme uses duplex section in the upper segment of dredging to increase the depth and width of the inset segment of rapids,which is conducive to reduce the water surface slope and flow rate.Although it creates an adverse impact on the upper reaches due to the sharply decreased water level,it has the best regulation effect.The navigation condition is improved remarkably after implementation of the project and navigation flow conditions are satisfactory.It may serve as reference for the regulation of similar rapids.

Abstract:Changzhou 3rd and 4th lane locks are the biggest single-step locks in China.Based on the parallel layout plan for these new locks,the filling and emptying system with single long culvert in the lock wall and lateral manifolds in the lock bottom has been put forward.By means of hydraulic analysis and model test (model scale 1〖KG-*2/3〗32),the specific layout of the filling and emptying system and the valve’s opening patterns under different operation mode have been determined,the hydraulic characteristics during lock filling and emptying have also been studied,the uneven flow distribution in lock chamber with single wall culvert layout has been well improved.The results indicate that the layout of the filling and emptying system is reasonable and practical;each of the hydraulic characteristics satisfies the designing requirements.The filling and emptying system which is laid out between the two locks is convenience for management and can reduce the work quantities,it also can save water due to the connecting culvert.The results can be used for the huge lock design and lock water saving study.

Abstract:The plain river flat slope protection is often damaged at the connecting part of the top and shoal face due to current scouring.Based on Bingyinzhou shoal protection engineering in the middle reach of the Yangtze River and referring to the protection structure,we take spacing-guaranteeing measures at the connecting part of the top and shoal face,where the current speed is relatively large.By generalized fixed-bed and flume experiment,we study the influence of different spacings and heights of the shoal protection on the flow structure and stability of the shoal face and optimize the protection engineering measures.The research results show that in the area of relatively small beach-face velocity,the spacing-guarantee measure is better.

Abstract:The data from 2008 to 2013 of typhoon and siltation of Yangtae estuary is collected.Because there is no data of measured sudden siltation and there is no scientific and effective statistical method in Yangtze estuary deepwater channel,we propose a statistical method of typhoon-induced sudden siltation based on the currently measured data of siltation for Yangtze estuary deepwater channel.By this method,we carry out a statistic analysis on the typhoon-induced siltation of Yangtze estuary deepwater channel from 2008 to 2013.

Abstract:Hujiatan waterway is a bending and broadening reach located in the upper reaches of the Yangtze River.This paper studies the bed evolution characteristics,navigation-hindering features,and formation causes of Hujiatan shoal waterway,and puts forward the waterway regulation ideas and schemes.The regulation effects are analyzed using 2-D flow and sediment mathematical model and based on the flow and sediment data of year 2002 to 2011.The results show that after the regulation,the navigation channel flow velocity increases and the reaches will not turn into rapids.Moreover,in the water level fluctuating period,the channel sediment erosion strengthen,the scour starting time advanced and the erosion duration prolonged.Correspondingly,the channel scale meets the design requirements and can remain stable,which indicates that the combined methods of construction of dikes,dredging and reef blasting are effective to Hujiatan shallow shoal regulation.

Abstract:Scaffolds constituted with three poles which are used to protect the coast and breakwater gain a very good protection effect on account of their unique characteristics that poles which constitute the scaffolds can disturb the flow pattern and consume flow energy.In order to explore the feasibility and the effect of scaffolds constituted with three poles for the scour protection as a new kind of beach protection measures，the flow structure near the protection system is measured in the process of carrying out the flume experiment.The effect of scaffolds constituted with three poles for three dimensional velocities and turbulence intensity distribution is analyzed.By comparing the longitudinal distribution of energy of unit mass of fluid near the riverbed with the protection system or not,the protection mechanism of scaffolds constituted with three poles for river bank is concluded.

Abstract:The anti-corrosion of the steel gate of Three Gorges dam navigation lock is the major factor that impacts the time spent on the check and maintenance of navigation lock.The corrosion of the steel gate is mainly electro-chemical corrosion.This paper analyzes the mechanism and the advantages & disadvantages of cathodic protection and coating anti-corrosion techniques,and comes to the conclusion that the best anti-corrosion method,which answers to all demands,is the combination of both cathodic protection technique and coating technique.

Abstract:To optimize the ship speed in channel and improve the channel capacity,we analyze the ship speed in channel according to the largest ship flow and adopting the traffic flow theory and car-following model.According to the main ship rates in the channel,we obtain the load of standard vessels,and calculate the length of standard vessels with the fitting curve by matlab.Based on the traffic flow theory and car-following model,we realize the optimal analysis of the ship speed.

Abstract:According to the demand of port information security,we design a set of three〖KG-*2/3〗-dimensional framework of the evaluation index system considering mainly the work level,security,and index types.Besides,combining with relevant requirements from the state on the port information security,we analyze 56 specific indices and propose the quantitative method and calculation method for the evaluation indices,which may serve as reference for the evaluation of port information security.

Abstract:There’re two bars outside the entrance of Minjiang river 0.2 million DWT entrance channel,i.e.the inner bar and the outer bar.It is a representative river estuary at which sand mainly comes from the land.This paper probes into two issues:1) To carry out an analysis on the formation causes of the outer bar according to the topography,flow & river type and based on the real-measured data concerning hydrology and sediment,and get the conclusion that the circulating current in the river bend is the main formation cause of the outer bar.2) Based on the analysis of the real-measured topographic map of the river estuary from 1886 to 1986,and considering the siltation process at the outer bar area,to propose the concept of “current having the characteristics of automatic transmission of resistance”,and explain theoretically the mechanism of diversion and bifurcation of the main current and put forward the condition of diverting.

Abstract:The change of the anchor location of single sheet-pile structure has a great influence on its structure system performance,however this problem is insufficiently considered in the current design and research.This paper consists of two parts.The first part is concerned with the design of the single sheet pile structure system using the free earth support method.On basis of the structure system design obtained in the first part,the second part applies the finite element method to investigate the effect of the anchor location on the wall bending moments,anchor forces and structure displacements where the sheet pile and the soil deformation characteristics are taken into account.The results show that,at the anchor point between the 0.25 and 0.3 times of the dredging depth,the maximum wall horizontal deformations and the ground settlements behind the wall reach the minimum value and as the anchor point moves down from the top of the pile,the anchor force increases and the maximum wall bending moment decreases.Furthermore,compared to one of FEM,the single sheet pile structure system of the free earth support method has the overestimating wall bending moments which are conducive to the safety of the wall pile and the underestimating anchor forces which lead to the failure of the anchor.

Abstract:The design of the pile is the key in all-vertical-piled wharf,which has a large free cantilever length.Taking a project for example,we compare the design of the all-vertical-piled wharf before and after adding two kinds of horizontal braces,and study the influential characteristics of horizontal braces on the internal force of the piles and beams.The results show that the displacement and bending moment in the pile top can be decreased effectively,and the bending moment of the piles is more harmonious by adding horizontal braces.

Abstract:Since a stable platform for construction of improvement of deep soft strata is the principal aim of shallow improvement of foundation with dredged slurry by vacuum preloading,slide in front of cushion advance,bearing capacity failure,punching failure should be avoided during construction of improvement of deep soft strata.Equations of the undrained shear strength of shallow improvement of foundation with dredged slurry are derived accounting for the bearing capacity failure and punching failure during improvement of deep soft strata.The undrained shear strength of shallow improvement of foundation with dredged slurry required by the stability of cushion advance should be gotten through overall stability analysis.It is shown by analysis that the undrained shear strength of shallow improvement of foundation with dredged slurry accounting for the bearing capacity failure and punching failure relates to the thickness of cushion,construction equipments for treatment of deep soft strata and thickness of shallow improvement,etc.The undrained shear strength of shallow improvement of foundation with dredged slurry required by overall stability of cushion advance increases sharply along with the increase of thickness of cushion when the cushion thickness is more than 1 m.The underlying slurry is thicker,and the undrained shear strength of shallow improvement required by overall stability of cushion advance is greater.

Abstract:Considering the soil arch effect,we redefine the coefficient of lateral earth pressure acting on the cylinder structure and propose a new formula of earth pressure around the circle of large cylinders.The new formula takes full account of factors that affect the soil pressure,such as the shear stress,internal friction angle and tube soil friction angle.The comparison with experimental results show that the proposed method is in good agreement with the measured values.

Abstract:As the land reclamation industry develops,the dredged silt will be hydraulically filled thicker and thicker,therefore it is proposed to employ the one-time vacuum preloading method to consolidate the ultra-soft soil ground with medium-thick fill of dredged silt.During the field test,the one-time consolidation improvement of the ultra-soft ground filled with 6～10 m thick of dredged silt is performed by two methods,i.e.vacuum preloading with and without sand cushion.Meanwhile,the vacuum degree,ground settlement,pore water pressure,layered settlement and other regularities are monitored and analyzed.Upon a comparison of shear strength and physical properties of soil mass measured before and after consolidation,it is shown that the ultra-soft ground with medium-thick fill of dredged silt is improved and consolidated remarkably using the one-time vacuum preloading method.In addition,the test results indicate that the two methods of vacuum preloading with and without sand cushion make no significant difference to the consolidation effect.

Abstract:Geotechnical engineering problems are found with human development and construction activities.Grasping the engineering geological properties of coral-reef is the key to solve the problems of the similar projects.Combining with the engineering project in the South China Sea and the Caribbean area,we carry out the field and laboratory tests to analyze the classification,structure,as well as physical and mechanical properties of coral-reef,and serve reference for the engineering projects with similar geological conditions.

Abstract:Caofeidian reclamation engineering is characterized by fine grain and long blowingdistance ,and the production capacity is low.In order to improve the construction productivity and reduce the construction cost,we analyze the CSD mining and transport data,and mud pump cavitation point to study the optimization of the construction technology.By the optimized construction technology,the construction productivity of Caofeidian reclamation land reclamation project is increased by 15%,the construction cost is cut down and the construction period is shortened.

Abstract:This paper proposes a design method for the inverted pendulum measurement system in slipway engineering construction considering the measurement accuracy,which has been realized by taking account of the floating stability of the inverted pendulum system,the influence of the wind load and current force on measurement,and the wire rope anchoring deviation.The application example shows that the method is effective and practical,and it has some referencial significance to similar engineering.

Abstract:The project of berth No.1 to No.3 in Kemen port,Luoyuan bay,Fuzhou,has a high grade of structure,and it has typical problems such as a great variety of buried depths of geologic rocks,and the complexity and limitations of the surrounding construction condition.Based on the determination of the width of the trench excavation,the design of the step profile excavation and the technical requirement of the heavy tamping,etc.,this paper provides a support for similar projects on the optimization design of the trench excavation width,the design of the step profile excavation and the technical index of the heavy tamping.