Abstract:The concept of “deepwater breakwater” is discussed based on the experimental studies of stability of minor armor blocks.The primary conclusion is that a breakwater can be called deepwater breakwater while itsH/d＜0.3 and the water depth ≥20 m,and be called shallow water breakwater whileH/d≥0.3.The rationality of the regulations on the stable weights for minor armor blocks in the current code is discussed,and some suggestions are put forward to improve the regulations.Two engineering examples are given,in which weights of minor armor blocks coincide with the research results.

Abstract:Langshansha submerged dike in Nanjing Yangtze river deepwater channel phase I project contains 1 869 meters semi-circular composite dike.The large-scale semi-circular prefabricated structure is a shaped thin-wall opening large components.The structure thickness of concrete cover is the key and difficult part of prefabricated engineering.This paper analyzes the influential factors of the thickness of concrete cover for the semi-circular prefabricated structure from many aspects,and discusses the means of improving the qualified rate of the thickness of concrete cover.

Abstract:A reasonable and accurate forecast of the depositional rate after reclamations in muddy coast is a challenge of the engineering sediment search.Based on the suspended fine-sediment deposition prediction model after reclamation proposed in the literature,the influence of wave actions on siltation after topographic changing works is focused on.Two-dimensional horizontal large-scale tidal current and suspended sediment transport model and wave model are set up,with which,siltation intensity in work area under different waves is calculated.The relationship of coefficient k0,by which waves influence on siltation is characterized,between relative wave height is established.The siltation intensity calculated by the formula proposed in the literature,whose coefficient k0 is obtained by the relationship above according to actual waves in engineering waters,well agree with the actual amount.

Abstract:After construction of water conservancy in the navigable river，the discharge of the unsteady water flow which is similar to the man-made flood peak and clear water of near to zero sediment concentration from the peaking power generation destroys the balance of the river，and thus brings a new topics for research on bed evolution and waterway regulation technology.Based on the flume experiment and theory analysis，we study the starting and transport rule of uniform sediment under the action of unsteady flow in the hub’s downstream. The result reveals that changing process of sediment rate under unsteady flow and flow condition are not synchronized,and it relates to the intensity of the unsteady flow P.When P is larger than 032,the sediment peak generally lags behind the rate of flow parameters of the peak;when P is less than 032,the sediment discharge peak may occur before the peak flow parameters.

Abstract:On the basis of Tianjin city overall urban planning and industrial layout,we plan to construct the 300 000 ton waterway of Tianjin port and the second artificial island.The experimental research on the movement characteristics of flow and sediment and the environmental effects after implementation of the deepwater port and artificial island project is carried out by the field observation,variety,evolution analysis,as well as physical model and mathematical model.The results provide a scientific basis for the construction of the project.

Abstract:The concrete block mattress is an economic and efficient mean for erosion protection,which is used widely in river bank protection projects and waterway protection projects,and also applied in some ocean engineering with poor wave and current conditions.The force on the block under action of wave and current is analyzed firstly,then series physical model tests about the stability of three concrete blocks with different thickness are carried out under three hydrodynamic conditions,ie.under the action of current singly,under the action of wave singly,and under the co-action of current and wave.The maximal current speed and the maximal wave height are measured in the tests,and the results of experiment are analyzed and discussed.This research provides reference for other similar engineering projects.

Abstract:The article sums up 4 main influencing factors of hydraulic fill sediment loss rate in dredging engineering based on the theory of fluid mechanics and a large number of engineering monitoring data,ie.soil particle size,filling quantity,effective capacity and flow path.The paper also analyzes the relationship between the 4 factors and the relationship between the 4 factors and sediment loss rates qualitatively or quantitatively based on the principles of statistics,and fits out the theoretical formula related to the sediment loss rate using the numerical analysis method.According to the results of the analysis the article puts forward specific measures to control dredging and filling engineering’s sediment loss rate.It may serve as reference for optimizing the dredging technology and cutting down the construction cost.

Abstract:The floating caisson for semi-dock berth of one oversea shipyard is for water retaining of this new berth.According to the analysis and comparison of project investment,construction difficulty,structure stress and safe reliability,etc.,we take proper measures to guarantee the design and manufacturing quality，and save the cost and time as well.The experience from this project may serve as reference for similar projects.

Abstract:Based on the in-situ test of bucket-based breakwater,we realize the measurements of soil pressure,pore water pressure and gradient on the structure.The test analyzes the maximal stress on each part of the structure.The result shows the new bucket-based breakwater is stable when driven by negative pressure and it makes sense for in-situ test of large-scale offshore deep-water structure.

Abstract:In order to give guidelines and recommendations for port designers,different approaches of wind force calculation,including general method,Chinese means,British Standard process and approach from OCIMF,are calculated and analyzed based on the practical case.

Abstract:Physical model experiment with 1:10 model scale is taken to test the wave absorbing effect with vegetation on east-breakwater in Tianjin center fishing port.The vegetation arrangement,trees rows and submerged depth are considered to analyze the absorbing ability of the vegetation.The results show that：1) the vegetation can reduce the wave height and overtopping water within a limited scope of wave height;2) as the absorbing effect,rectangular arrangement is better than the quincuncial one;half-submerged water depth is better than the all-submerged and the more planted rows the better for wave absorbing;3) for the project of Tianjin center fishing port,the maximum rate is 32.9% for wave height decrease and 87.8% for overtopping water decrease with 7 rows trees on the breakwater shoulder.

Abstract:Based on the practical project,the author calculates the temperature stress of the 40 m diameter concrete silo in port due to season variation and in-and-out temperature difference,analyses the inner force distribution of the silo wall due to different temperature actions,and converts the temperature stress into the circular force of silo wall,and analyses the ratio of the circular force in silo wall generated by the temperature stress and stored material pressure.The results are useful for designers to correctly grasp the temperature influence on the internal force of silo wall,strengthen the structure measures and ensure the structural safety.

Abstract:With the pace of domestic harbor construction to overseas,the seismic stability problem of breakwater has become particularly prominent in high intensity earthquake area.But domestic references about how to analyze the seismic response of breakwater are insufficient.Based on FLAC-2D ,some remarkable problems about geometrical modeling,boundary condition and applying damping are discussed and results of seismic response analysis in the cases of foundation treated and untreated are compared,which can serve as reference for similar projects.

Abstract:For the case that the gravity wharf has large load increasing after the upgrading and rebuilding,the structure stability and the bearing capacity can't meet the specification requirements.The method of adding pile foundation and simply supported slab platform to form the unloading platform is proposed,which can reduce the earth pressure.The calculation result shows that the unloading platform has significant effect on improving the stability and bearing capacity of the structure and reducing the foundation stress.The advantages and disadvantages and adaptability of this structure are studied after.

Abstract:The pier of floating-wharf is used in refuge harbor basin for work-boat of Yangshan deepwater port，and traditional barge-mooring can not meet its operation requirements.A new-type pontoon-mooring is creatively advanced：two 1 200 mm steel-pipes in landside and one 1 500 mm steel-pipe in seaside to constitute a stable support-system,in which,loads are evenly distributed and the structure stress is definite.The removable-flapper is installed to help the pontoon remove for dredging or maintenance.

Abstract:This paper points out the demonstration content beyond the original design of ship berthing capacity from the sailing fitness,the port ancillary facilities and the main security accounting，etc.Combining with the engineering example,the paper introduces the application of gravity quay-wall’s berthing capacity demonstration.

Abstract:The variety of petroleum products transported by ships is increasing gradually.In order to make the pipelines more flexible,we shall clear the piping system by empting the pipelines.This paper introduces the common piping technology and calculates the gas pressure and flow in piping system based on the practical engineering case.The result may serve as reference for the selection of air separation equipment.

Abstract:With the gradual warming of the Arctic climate,the melting of Arctic ice cap is accelerating,resulting in the increasing possibility for a fully navigable Arctic channel,which would not only become a new shipping channel linking the Central Europe,China and the US.,but also a challenging alternative for traditional navigation channels and a major impact transforming the pattern of international shipping industry as well as the future development of shipping business in China.This paper introduces the influence of navigable Arctic channel,globally and domestically,upon China’s economy,patterns of shipping business,natural resources distribution,and geographical environment,etc.,analyzes its history and current status,along with strengths and weaknesses,and proposes coping strategies and suggestions for China to deal with forthcoming challenges of navigable Arctic channel.

Abstract:The waterway is bore with vessels,whose OD points compose the traffic flow.The waterway transit capacity is the waterway bearing capacity of traffic.To study waterway transit capacity,we introduce the network model,regarding the ports as the nodes and the legs as the lines in the network mode.Considering the cargo flow OD structure,which is closely related to the channel transit capacity,we establish the network model with OD structure,in which the cargo flows between the arbitrary original point and destination port is the variables,the sum of all goods flows or freight turnovers is the objective function,subject to the leg transit capacity,port throughput capacity and obstructing transit capacity constraints.

Abstract:In order to solve the problem of navigation-obstruction of large ships sailing in the reservoir’s tail reach,we analyze the navigation characteristics in Wailiang reach,and study the regulation scheme of Wailiang reach with the mathematical model by taking Wailiang reach for example.Comparing the regulation effects of different schemes,we recommend the optimal scheme to provide a support for the regulation scheme of the reach.

Abstract:This paper analyzes the direct economic benefit from the Yangtze estuary 125 m deepwater channel project by means of “with-without comparison”. The direct economic benefit is analyzed by data about VTS & AIS ship data records from container ships,bulk carriers and tankships in the Yangtze estuary deepwater channel and throughput along the Yangtze River in the three steps of the deepwater channel project.It draws a conclusion that the Yangtze estuary deepwater channel project has been playing an important role in speeding up the construction of Shanghai international shipping center,driving along the rapid economic growth and bringing industry organization optimization adjustment along the river.

Abstract:After impoundment of the Three Gorges reservoir，the incoming water and sediment conditions of its downstream river reach are changed.Consequently,changes occur in the riverbed evolution.On the basis of measurements and research findings by predecessors,aiming at the downstream reach of bed sediment composition,in order to study the riverbed evolution,we carry out physical model test by the double sand method to study the variation of river regime of the reach,which provides reference for the the next stage work.

Abstract:The channel regulation should be implemented at appropriate time before the navigation condition is deteriorated.Taking the regulation of the Dayu beach in the Huaihe outfall waterway (Hongshantou to the Grand Canal section) as an example,various erosion schemes of the head of Dayu beach are calculated by a two-dimensional flow model.The consequences without protection at the head of the beach are analyzed which explains the necessity of protection.At last,combining with the recent river evolution,a beach regulation layout plan is proposed.This method may serve as reference for the decision-making of the regulation plan.

Abstract:Refering to the Xiaoqing river channel complex stochastic and undulatory property of its runoff time series，we use the wavelet transform method to analyze and explore the complex property of the runoff time series through calculating its time varying Hurst index.The results indicate that the runoff time series in the upstream of the Xiaoqing river follow a fractal distribution,with a strong persistence and long-term dependence.This provides a new idea and method for the utilization of water resources.

Abstract:Based on the real-measured data about Zhijiang-Jiangkou River waterway before and after imnplementation of the first phase regulation engineering,this paper analyzes the variation of channel condition and flow condition after the implemenmtation of the first phase regulation engineering.The result shows that after implementation of the regulation project,the key bars in the reach keep stable,the channel condition is improved,and the trend of rapid dropping of the water stage in the rivwer reach is controlled to a certain degree.The engineering effect is remarkable and the regulation engineering has reached the design standard.

Abstract:Influenced by both Dahejia hydropower and Sigouxia hydropower,Dahejia to Sigouxia river reach on the Yellow River is complex in natural condition,so it is necessary to assure the design lowest navigation water level in order to suitably and economically carry out the regulations and exploitation of this river.Considering the influences of operating characteristics of two hydropowers,we establish one dimensional mathematical model to calculate the design lowest navigation water level,and obtain the reasonable design lowest navigable level.

Abstract:During construction of the main bridge pier in inland waters in China,to guarantee the normal ship navigation,the maritime administration requires one-way traffic.Therefore,during construction of the main pier bridge,ships possibly wait to cross the bridge,and thus inevitably result in the complex navigation environment in the bridge area.At present,enough safety distance between ships is specified by the maritime administration department.A quantitative study on ship navigation safety distance is carried out by establishing a mathematical calculation model of bridge waters (one-way navigation) to provide a scientific theory basis for the maritime administration to work out the navigation safety management regulations and guarantee the safety of navigation environment.

Abstract:With the rapid development of the inland waterway,it turns to be a knot for the management departments to improve the navigation capabilities of the restrictive inland waterways.According to the research and analysis of the Yan-Shao waterway,we identify the factors which influence the navigation capabilities of the shiplocks and waterways by introducing the theory in the ship traffic flow area and in the ship area and using a new calculation method,and propose proposes corresponding solutions.

Abstract:This paper illustrates the concept of inland-waterway corridor,proposes the analyzing method for the demand forecast and capacity of inland-waterway corridor,and gives an example on the northern-Jiangsu section of the Grant Canal corridor，which can be used for reference to the area with inland-waterway network.

Abstract:By analyzing the existing problems of track mapping currently,we propose the design of track automatic drawing tools which is flexible and independent,accurate and effective.Simultaneously,in order to guarantee the accuracy of the mapping,we make a research of rendering algorithm for the ship structure point,and make the design achieved by AutoLISP and DCL.We effectively improve the efficiency of the track drawing by applying it to the actual project.

Abstract:Using the soil testing after vacuum preloading or vacuum combined with surcharge preloading in the actual project,we get the water content and liquid index of soft soil to research the variation of soft soil’s liquid index in the condition of vacuum preloading or vacuum combined with surcharge preloading,explore the relationship between the reinforced soft soil’s liquid index and the liquid limit & imposed loads,to provide reference for the design and construction.

Abstract:The rock-socketed cast-in-place pile is used in a hydraulic dock in East Africa.The bearing stratum is strongly weathered rock and the socketed depth is 8 m under the pile tip of steel casting.The crimping of steel casting is found during drilling.Whole-process PDA test shows that the bearing stratum is hard,the transfer efficiency of energy is 92.4%，and the maximum stress of the steel casting pile is 220 MPa.The average set of last 10 blows is decreased as the designer requires and socketed depth increases to 13 m.The bearing stratum is completely weathered rock according to the new scheme and crimping completely disappeares.The engineering experience may serve as reference for the theoretical research and engineering practice of rock-socketed cast-in-place piling.

Abstract:Based on the research on the construction cycle and construction parameters of TSHD,we determine the optimal loading time,so as to improve the TSHD productivity and reduce the construction cost.The determination of the optimal loading time of TSHD improves the TSHD construction productivity of Huanghua port 200 000 ton waterway and reduces the construction cost.

Abstract:The tensile stress,crack width and other parameters are analyzed using the analytical method,and the calculation results agree well with those from the field observations.According to the calculation of concrete temperature shrinkage stress,the full-section pouring temperature shrinkage stress is larger than that of the layered pouring.Taking measures including shortening the time interval of pouring between two layers,changing the layered pouring into full-section pouring,lowering the foundation’s damping coefficient,choosing a reasonable segment length,ect.,we can control concrete’s temperature shrinkage cracks effecitvely.

Abstract:Dredging in shallow area has always been a knot in the maintenance dredging of inland river waterways.It is impossible for a trailing suction hopper dredge to sail to the dredge cut and execute dredging operation when the channel depth of inland rivers can’t meet the requirements of unloaded draft of a self-propelled trailing suction hopper dredger.A newly developed high-pressure water jet and suction system installed in the stem of trailer has successfully solved this problem and achieved good economic and social benefits.

Abstract:When dredging hard clay by the trailing suction hopper dredger,there has some problems such as draghead blockage,cavitation and low production.This paper mainly introduces the dredging construction method for the stiff clay Bayuquan port 250 000 t channel by the trailing suction hopper dredger with plough teeth and soft grid,which effectively solves the problems of draghead blockage and cavitation,and raise the comprehensive production capacity by more than 60%.