Abstract:Based on the research results have been and field data of Yizheng waterway,this paper analyzes the bed evolution regularity and main problem of the waterway,and proposes the waterway regulation idea based on the navigation development demands and waterway regulation targets.It also carries out a research on the optimization of the engineering scheme to serve as reference for the 12.5 m deepwater channel regulation.

Abstract:In the management of the Yangtze River (Yangzhong part) riprap revetment,the effect of riprap revetment is detected by extracting profile lines through Hypack,but the statistical result of this method is affected by the probability,which is not unique,and will lead to disputes.For the drawbacks of Hypack,combing the construction data and actual demand,GIS (Geographic Information System) is put forward to analyze the effect of riprapping.Comparing the analysis results of Hypack and GIS,we demonstrate the superiority of GIS in reflecting the real terrain,calculating the settlement,loss and supplement amount,and showing the 3D effects,which provides a technical support for improving the construction technology,making up for the construction failure,and reducing the construction cost.

Abstract:The expression and accurate prediction of the ocean wave period is a knot. Factors affecting the wave period are often ignored in the simulation and there is no detailed analysis on influencing factors.The evolution characteristics of the wave period of deep-water breaking waves are experimentally studied. Deep-water breaking waves are generated by the method of energy focusing in a 2D wave flume and the intensity of wave breaking is toned by changing input wave amplitude.The spectral averaging period and the average period T and effective period TH1/3based on Zero-up crossing method are computed for surface elevations.It is concluded that the four kinds of spectral averaging periods are stable outside the focusing area.When focusing waves don’t break,the variation rate of wave periods is less than 1%.Breaking causes wave period’s increasing and the increment is more appreciable when the wave breaking is stronger.Through comprehensive analysis from the stability and the wave nonlinear mechanism,the variation of T0,2 along the flume could reveal the evolution characteristics of the wave period in the process of deep-water wave breaking.

Abstract:The WRF wind model and SWAN wave model are used to calculate seperately the wind and wave fields of Bohai bay,which are in good agreement with the measured data of a wave buoy.With the sample of the results,the P-Ⅲ curve is used to analyze the characteristics of wind and wave with a return period of 50 years at -15 m depth contour in Laizhou bay. MIKE21 SW model is used to establish a numerical model of wave for Weifang port and calculate the wave propagation with a return period of 50 years.The results show that the model is suitable to simulate the wave propagation in Weifang port,and can provide a scientific reference to the design and construction of the pier,dike and channel in the port.

Abstract:Wave is an important environmental load on porous structures in coastal engineering.A reasonable mathematical model is very important when the problem mentioned above is numerically solved.To be applicable in such problem,with both of the drag resistance and inertia resistance considered,Laplace equations with boundary controlling conditions are given.First these equations are nondimensionalized,and started from the free surface velocity potential in still water depth,a power series of potential are supposed,and four sets of different Boussinesq models are derived.In a constant water depth,the dispersive relationship expressions of the four models in one dimension are given.And theoretical solutions of the Boussinesq models are compared against the analytical solution.Overall,both of the phase speed and imaginary wave number are in good agreement.And the high order Boussinesq models can be expected to be applicable for waves propagation in porous media.

Abstract:This paper studies the effect of the water depth on the compaction rate and the stress of the enrockment ground with dynamic consolidation by model test,and analyzes the relationship between the compaction rate and the stress of the enrockment ground and the drop height of the pounder under anhydrous and hydrous conditions.The results reveal that the water flushed with the enrockment ground is similar to that under deep water condition.The research results provide a theoretical basis for the scale model test.

Abstract:Based on the topography,bathymetry data and remote sensing image in different periods,we adopt the GIS technology to analyze changes of Daishan northwest coastline and the seabed erosion and silting offshore.Then local hydrological and sediment features and the human sea reclamation activities are combined to study the main influential factors on the sea erosion and silting of the northwest area of Daishan island in recent 30 years.Research shows that,before 2011,northwest Daishan coastline was stable,and the seabed had experienced a dynamic evolution process from silting on beach and erosion in trough to erosion both on beach and in trough.The erosion and silting-up rate were generally less than 10 cm/a in the sea area between Daishan island and Dayushan island,with a trend of overall increasing erosion rate,except for some local troughs where the seabed change was more intense.After 2011,due to the large-scale reclamation project,seabed shallower than 5 meters off northwest Daishan silted with a rate of about 1.75 m/a,while other sea areas were still rushed by erosion.The sediment route in Daishan northwest mainly depends on the transit transport.The reduction of sediment from the Yangtze River and the increase of the reclamation activity in recent years are the two main influential factors of the seabed sediment evolution of the waters.

Abstract:This paper analyzes the common major factors of reclamation elevation design of offshore artificial island,and summarizes stipulations on the reclamation elevation design of land formation with the national standards and industrial standards.For reclamation elevation design reference of offshore artificial island,a general relation formula and methods for determining some main parameters of reclamation elevation design are given.

Abstract:To obtain the relationship between crack width and steel corrosion ratio of the structure,and grasp the nondestructive testing technology of it,we adopt the CT scanning technology to test the accelerated corrosion concrete members,and analyze the correlation between crack width and steel corrosion ratio.The results show that the correlation curve of crack width and steel corrosion ratio is in the same trend of other researchers’ curves,but the change rate is different.The curve can be referenced for change law of concrete structure crack width and reinforcement corrosion rate.Meanwhile,the CT scanning technology can be applied to concrete nondestructive testing.

Abstract:The open-type wharf is widely used in port engineering.Due to the complexity of load combinations,calculation that covers full load combinations usually costs a lot of time.When simplification is applied,accuracy will be sacrificed or most dangerous load combination may be missed.An automatic calculation method is put forward and corresponding data management platform is built on SQLite and Python. Load effect is calculated on single effect by Staad.First of all,the distribution polymorphism of generalized uniform and generalized mobile loads is dealt with,then the load effect of discrete position of all members is computed.Envelope diagram is the final output of this method.The method greatly reduces computational complexity and highly increases efficiency.The achievement of this article makes refined and accurate design possible.

Abstract:The curvature modal,curvature modal difference and wavelet transform are employed to correctly identify the damage of the high-piled wharf structure.The feasibility and applicability of these methods are verified through simulation experiments of a high-piled bent under different operating conditions.The comparison results show that the wavelet transform of curvature modal can localize the structural damage when the non-destructive modal is unknown.Besides,the curvature modal difference can exactly localize the structural damage when the non-destructive modal is known.The further analysis shows that the peaks of wavelet transform coefficients and the sudden changing values of the curvature modal difference can be utilized to determine the damage extent for multi-damage of high-piled wharf structure.

Abstract:The floating breakwater is a kind of important structure in ocean engineering,which is economical and environmentally friendly.This paper expounds firstly the development process of the marine floating breakwater,then summarizes the latest research results of floating breakwater at home and abroad,and demonstrates the experimental research and numerical simulation of the structure type of floating breakwater.According to the lower part of the floating breakwater with or without damping structures,the structure is divided into two types,i.e.box-plate type and plate-resistance type.This paper mainly discusses the problems and shortcomings of the present research,and makes a prospect for the future research direction of floating breakwater structure from the aspects of durability,design standards and new materials,etc.

Abstract:It is important to assess reasonably the design through capacity of general berth for maximizing the port production efficiency.Based on two designs through capacity calculation formulae of the general berth in the Design Code of General Layout for Sea Ports,we analyze two calculation formulaes’ differences and their transformation relationships,and put forward two calculation methods,i.e.the calculation method of artificial decomposition work days or the berth utilization ratio and the calculation method of the proportional factor of the throughput.Example calculation results of a general berth project in north China shows that the two calculation formulaes in the code are practical,and the designs through capacity according to the two calculation methods are basically consistent.

Abstract:Under the influence of the slope,the earth resistance in front of the sheet pile quay wall caused by the trapezoidal-cross-section finite soil body is different from that in the half-space situation.Adopting the finite element software PLAXIS,we establish the model to simulate the stress on the sheet pile wharf which is on the steep slope,analyze the difference of internal forces,and summarize the calculation method of the internal force and the structural stability.

Abstract:The structural calculation of the sheet-pile wall is an important factor in sheet-pile wharf,which is a major form of wharf structures.The buried depth of the pile and the precision of inner pressure have close relationships with the stability of the wharf structure.Taking Zhenjiang Zhongchuan heavy cargo wharf for example,we use three methods to calculate the buried depth of pile,including the elastic line method,m method and free support method,while the elastic line method is the most frequently used in practice in China.Eventually,the comparison among the results from three methods can sum up the application range,pros and cons,and improvement suggestions for each method,thus provide reference and guidance for the actual engineering and design.

Abstract:The two-dimensional mathematical model for water exchange in Maowei sea is established using the dissolved conservative material as the tracer. The pollutions are fed back at boundary under assumption that the gradient of pollutant concentration is the same both inside and outside the boundary.Based on the validation of the mathematical model,the effect on the volume of tidal prism and water change of Maowei sea is calculated and analyzed by the reclamation of the Qinzhou bay mouth.Results indicate that the width of Longmen strait is the key factor for keeping the volume of tidal prism of Maowei sea.The reclamation engineering in both sides of Qinzhou bay mouth keep the width over 9.4 km and has little effect on the water half-exchange period and the tidal prism of the Maowei sea.

Abstract:Dike failure is caused by overtopping breakwater,which results in a serious loss of lives and property. To solve this problem,a series of physical model tests were conducted on stable thickness of block revetment on the inner slope of the seawall.According to the erosion of block embankment with different thicknesses,we probe into the relationship between the armor thickness and average overtopping.Equations are given for the stable thickness of facing block on the inner slope. New equations are also presented for average overtopping discharge based on the analysis of mean wave overtopping and comparison of the domestic and foreign existing overtopping formulae. It can provide reference for the design of seawalls.

Abstract:The reinforcement and reconstruction to improve the berthing capacity is a major way of wharf engineering construction in today’s world.Taking the main wharf structure reinforcement and reconstruction of Shanghai port for example,method of reinforcement and reconstruction for beam-slab high-piled wharf to improve the berthing capacity is expounded systematically,the result of which may serve as reference for similar projects.

Abstract:A 3D model of tetrapod armor unit is set up based on the given data in Code of Design and Construction of Breakwaters(JTS 154-1—2011)with computer aid design software Solidworks.Three orthographic views are exported to find some existent mistakes.The revised version is given for the design and construction of the port engineering.

Abstract:This article researches the seasonal differences caused by wave dynamics impacting on the riverbed during the flood and dry seasons in the mouth bars of the Yangtze River estuary.Some perceptions are as follows:1)For the distribution curve of wave energy,during the dry season,wave energy is focused on the range of 4.0～7.0 s,waveform presents a narrow peak,while during the flood season,the energy concentrates in the 4.0～12.0 s,waveform appears broad or double peaks;2)Compared with the dry season,the long period waves occurring in the flood season are more frequent,and the proportion of energy to the overall increases significantly,the quantity reaches dozens of times;3)In the mouth bars,according to different periods,waves can be divided into 3 types,i.e.low-energy wave,high-energy wave and transitional wave.Low-energy waves almost unchange the riverbed in deep water while high-energy waves are completely reverse,but the influence of transitional waves on the mouth bar area is uncertain,and it in determined according to the change of the wave direction.

Abstract:Based on the one-dimensional and two-dimensional unsteady-fractal mathematical model of Yibin to Zhutuo reach downstream Xiangjiaba dam,we research the flow conditions and local beaches with the cumulative and variable dimension fractal method and obtain the channel length of river profile fractal dimension and fractal dimension river cross-section width.We also probe into the response of the river profile fractal dimension and river channel transverse section to the fractal dimension of navigation hydraulic indices.The results show that:1) in Yibin -Zhutuo river reach,with the decrease of the longitudinal profile fractal dimension,the river cross-section fractal dimension turns smaller gradually;2) under the condition of meeting the requirements of the lowest navigable flow,the profile fractal dimension values of Yibin - Luzhou section is within the range of -1.297～-1.049,and that of Luzhou-Zhutuo section is within the range of-1.305～-1.032;3) in Yibin-Zhutuo river,under a certain flow cross-section,the fractal dimension numerical reflects the degree of correlation of the terrain and traffic,while beach profile fractal dimension reflects degree of correlation of the whole river topography and discharge process.

Abstract:Valve cavitation problem is the most critical technical problem in the design of high-head lock.Serious cavitation of the lintel and the hemline will arise the “vibroacoustic” phenomenon,which will lead to denudation of valve panel and corridor concrete,and thus seriously affect the engineering quality and safety.The cavitation defense measures for the lock valve are researched based on the actual engineering and satisfactory results are obtained.The research methods and measures are applicable to most cases,so they may serve as reference for the similar engineering.

Abstract:Based on the analysis of the effects of drain-pipe on the channel slope stability,this paper puts forward a new drainage structure,i.e. horizontal drain-pipe.The result of the experiment on the horizontal drain-pipe implemented under the complicated geologic condition in a revetment engineering in Douhudi channel reveals that the horizontal drain-pipe can eliminate the underground water and seepage,so as to weaken the damage on the slope’s stability.The deep horizontal drain-pipe technology was applied to the Yangtze River channel regulation engineering for the first time and achieved a good engineering effect,so it may serve as reference for similar projects.

Abstract:The filling and emptying system with chamber floor’s long culvert and lateral orifice is one of the typical dispersed filling and emptying systems.They are widely applied in the medium and high water head ship lock engineering.In the process of its design and construction,the pores’ layout,open ditch energy dissipation,in-chamber ship’s mooring forces and cavitation of valves are the key hydrodynamic problems,which directly affect the work efficiency of the filling and emptying system and the berthing conditions .Nowadays,fruitful achievements have been already made.Whereas,there are many difficult problems to study.Based on a large amount of research data at home and abroad,we study the filling and emptying system with chamber floor’s long culvert and lateral orifice from the above aspects.Moreover,we set four key problems to be researched in the next stage,hoping to provide reference for further research in this field.

Abstract:The water transfer project from the Yangtze River to the Hanjiang river is a large water transfer project from Jingjiang reach of the Yangtze River to Xinglong reach of the Hanjiang river to supply water for the lower reach of the Hanjiang river considering the reduction of water supply due to the first stage midline the project of the South-North water diversion project ,with an annual average carrying capacity of 3.7 billion m3.The water-intaking project will have an influence on the Jingjiang reach in the middle reach of the Yangtze River.Considering the Three Georges project 175 m trial run period (after 2008) as a general hydrological year and according to the design water-intaking volume fo the water transfer project from the Yangtze River to the Hanjiang river,we calculate the change of the flow and water level of the main river channel of the Yangtze River caused by the intake works and analyze the variation of channel condition in the affected reach.

Abstract:Based on the Nan’gang industrial zone land reclamation area V project and according to the site test data,we analyze the variation law of the moisture content with the depth,the variation law of each layer’s moisture content with the time,as well as the relationship between the moisture content and elevation,and get to know that the moisture content of the silty reclaimed soil is less than 85% and 2 years of drying time is needed,and the initial reclamation elevation shall be above 6.91 m to meet the requirement of the check and acceptance.The project has a good effect,so it may serve as reference for similar projects.

Abstract:Taking No.6 high and steep slope design of the second phase extension project of Chongqing port orchard work zone for example,we introduce the way of combining topography,geology and land occupation condition to carry out stability analysis on high and steep reinforcement fill slope using the method of Bishop on the basis of limit equilibrium theory,and accordingly make economical and practical design scheme.The design scheme can be confirmed after the security is validated by centrifugal model test.Finally,we examine the safety and reliability of the design scheme by monitoring measurement results in the construction period,to serve as reference for high and steep fill slope treatment in harbor land area engineering and road engineering.

Abstract:The method suggested by Code for Seismic Design of Buildings is conservative for deep soils, while NCEER method is complexity for engineering practice, in addition, the calculation result is unsafe for deep soils.In this paper,the NCEER method based on standard blow number is simplified,and the expression of critical blow count is derived.The improved method based on the simplified NCEER method and code method is proposed,which can be expressed as a function of depth of water table and calculation point and easy for engineers to master.

Abstract:Based on the adiabatic temperature rise data of concrete,we carry out a whole-process simulation and calculation of the temperature stress field of mass concrete during construction of the wind power foundation platform of the Pinghai Bay. By comparing and analyzing the temperature stress field of the concrete structure under the condition of cooling water pipe or not,we know that the effect of the cooling water pipe is obvious,and it can effectively reduce the temperature difference between the temperatures inside and outside and the highest inside temperature.The simulation results can guide the design and construction of wind power foundation platform,prevent cracks effectively,and improve the construction quality.

Abstract:Combining with existing wharf structure reinforcement projects in recent years,we carry out a comprehensive and systematic analysis and put forward a complete set of technology for the strengthening and renovation of the wharf structure,which can provide a safe,suitable and exemplary technical method for the wharf structure reinforcement designing and construction.Meanwhile,it provides reference for building up a complete set of more systematic,scientific and standardized and effective technology system.

Abstract:This paper introduces the construction principle of multi-head stirring pile and high-pressure spraying pile,and proposes a method which combines the multi-head stirring pile with high-pressure spraying pile in seepage engineering construction,which was used in the seepage proof curtain of Jiuwei port second-line ship lock project. According to the actual application,we compare the quality effect,construction cost and construction efficiency of the two construction methods.The results show that both of them can meet the requirement of seepage control,but multi head mixing pile has more advantages in economy and work efficiency,and its engineering adaptability is relatively poor. Based on the two characteristics,the construction technology which combines multi head mixing pile with high pressure spraying pile will be widely used in various types of seepage engineering.