Abstract:Based on the field data of Tongzhousha and Baimaosha waterway, the historic evolution, recent evolution law and the evolution relationship between Tongzhousha and Baimaosha waterway are analyzed. Suggestions on the regulation, such as regulation key parts and opportunity, are proposed. The research results indicate that the evolution influence of Tongzhousha to Baimaosha decreases gradually, but the diversion of Xuliujing is insufficient, the change of the mainstream of Tongzhousha still exists certain relationship to Baimaosha. As for the regulation, it is suggested that we shall control the left edge of Tongzhousha and Langshansha and the head of Baimaosha as soon as possible.

Abstract:Model studies on local scour in Baimaosha channel project of the first phase of the Yangtze River deep water channel project from Nanjing showed that: 1) It is feasible for adopting local normal model to study local scour on project in tidal estuary. 2) Choice of the test hydraulic conditions, determination of model shoreline and total variable slope of model, etc. are the key technical issues to be addressed for adopting local normal model to study local scour on project in tidal estuary. 3) The target test hydraulic conditions are well simulated in the local normal model of Baimaosha channel project and the model can be used for carrying out further tests. 4) This paper presents a simple and good method to determine model shoreline.

Abstract:Based on the wave modeling test of irregular wave, this paper analyzes the variation regularity of the relative depth on the location of the maximal wave pressure under irregular wave action, and gives the formulae of the maximum relative wave pressure and wave pressure along the slope by analyzing the regularity of the maximum relative wave pressure changing with the break parameter ξ.

Abstract:The characteristics and restrictions of the parabolic mild-slope equation are described from the theoretical basis. According to the needs of the practical engineering, wave heights of the two improved programs on Dalian general-stone pier are simulated and researched using the REF / DIF model based on the parabolic mild slope equation. The simulation results show that both program 1 and program 2 can meet the harbor mooring conditions, and program 1 is better than program 2.

Abstract:Taking the southern operating area of Lanshan port as an example, this paper analyzes the scheduling of ship’s entering the port in higher tide at the initial stage of the surrounding basin. There is a larger angle between the channel axis of the southern operating area of Lanshan port and the flow direction of mainstream of flooding and ebbing tides, resulting in a larger cross-flow in the channel near the entrance. The cross-flow during the flood phase is larger than that during the ebb phase. The largest cross-flow during the flood phase presents at 400 m along the channel axis outside the entrance. According to statistic results, the relationship between the maximum velocity during the flood phase and tidal range and relationship between the designed tide-bound water level during the flood phase and the maximum velocity during the flood phase is established and then water depth and cross-flow are calculated by inqurirying the tide table, so as to provide a scientific basis for determinating the time of ship’s entering port in higher tide, and thus achieve the goal of ship scheduling.

Abstract:This paper presents results and discussions on an experimental study conducted to relate the influence of external conditions, such as the corrosion rate, the conduction time and the level of sustained load,on the mechanical properties of the corrosive beams under stress states that corroded by electrolyte accelerated corrosion test method. The strain for the cross section and the cracking development of corroded beams in the process of reinforcement corrosion are analyzed to provide a reference for further study of reinforced concrete beams supporting varied loads.

Abstract:Based on the analysis to existing methods of mathematical model prediction and optimized analysis to exponential curve model with certain modified method, we put forward a new modified exponential curve model.The correlativity coefficient of this modified exponential curve model is over 0.996 according to the fitting analysis of actual measurement data of static load test of different types of single piles, and the fitting effect by the model is better than that by hyperbolic model and integrated exponential curve model. The modified exponential curve model can describe P-s curves of single piles well, and it can be used to forecast the ultimate beating capacity of single piles.

Abstract:The trailing suction hopper dredger is such a kind of construction ships with high energy consumption. By the study and application of energy-saving technology, not only the fuel costs could be saved, also the environmental pollution caused by ships could be reduced, therefore both economic and environmental benefit could be achieved. By introducing the definition of energy conservation and evaluation of the trailing suction hopper dredger, this paper discusses the energy-saving technology and present application status of ship design, power equipment, the development of dredging machinery and integrated monitoring system, and construction of single suction pipe dredgers.

Abstract:The channel-shoal system in Qinzhou bay consists of east, middle, west three major tidal channels and interpolating sand shoals (ridges). Numerical modeling of the morphodynamics of the channel-shoal system is performed using 3D unstructured grid, finite volume, paralleled computation FVCOM. Erosions occur within channels and depositions occur on shoals and at the end of channels, reflecting that tidal flow is really the dominant force to maintain and modify the channel-shoal system; two large-scale dredgings at the east channel during Sep. 2000 and Dec. 2012, and Feb. 2004 and Dec. 2008 respectively have caused the present sea bed erosion & deposition adjustment in the whole Qinzhou bay, the magnitudes of which are large initially but decreasing steadily;this adjustment process will last over 100 years if no further coastal engineering project is conducted and other presumed conditions are maintained. The morphological adjustments caused by various constructed and planned engineering projects might reinforce each other. This needs further comprehensive modeling study.

Abstract:Wind field under Jelesnianski tropical cyclone is applied to simulate the typhoon field. The SWAN model is based on the action balance equation, which is used to calculate the potential threatening typhoon waves in the sea region during 1951-2010. The model is well verified using field wind and wave data. With the results of the typhoon simulation, the wave height data is analyzed with regression analysis, and comparison of the simulated wave parameters with the measured values show good agreement. This research can provide scientific basis for projects in the sea area in the future.

Abstract:Based on the generating and absorbing wave technology of momentum source method, this paper simulates successfully the wave effect on sloping submerged breakwater under different combination of slope angle and water depth using the fluent software. According to the analysis of the force affecting on sloping submerged breakwater under different slope angles and water depths, the conclusion that water depth has great influence while slope angle has little on the wave force on the slope-type submerged breakwater is drawn. The research can provide a calculation model for further study on the mechanical behavior of slope-type submerged breakwater under wave dynamic load, and provide valuable reference for practical engineering design.

Abstract:Influenced by multiple factors, distribution and variation law of the mean tidal range in eastern coastal China are quite complicated. Therefore, based on the continuous hourly observation data of 1 year at 21 tide gauges in eastern coastal China, annual mean tidal range and monthly mean tidal range are statistically analyzed.Furthermore, distribution of the annual mean tidal range and variation law of the monthly mean tidal range are also analyzed. The results show that besides the astronomical factor, runoff and morphology of the bay are important factors which can influence distribution and variation law of the mean tidal range. In the coastal area, influenced by the astronomical factor, monthly mean tidal range varies regularly. But in the river estuaries or the areas influenced by the acyclic factors, variation law of the monthly mean tidal range is irregular and complicated.

Abstract:The operation reliability of arc-type ship’s anti-collision facility directly relates to daily operational flexibility and security, so it is of great significance to study it. The operation reliability is quantified to the possibility that driving force is bigger than the resistance with the performance reliability evaluation model.In order to improve the test efficiency, the test program is optimized by the enhanced test model. The mechanism model is established, and four strain measurement units are laid on the junction between collision belt and buoy.The mechanism model test results show that, under the condition of strengthened test, no abnormal output occurs in 25 test cycles and the buoy stuck didn’t appear in 25 test cycles. It proves that the design of the facilities meets the reliability requirements.

Abstract:A comparative study is made on seismic design of port structures based on Chinese code, US guidelines, Japanese standards, as well as the guideline of International Navigation Association. This is the sixth of the series papers and the measures for strengthening structures to resist earthquake proposed in these codes are analyzed. It is shown that in US guidelines, the criteria for identifications of regularity and irregularity of wharf and principle of pile arrangement are presented, the details of reinforcement of connection between slab and pile are highlighted. There is a great difference for the application of brace pile in seismic design in Chinese code and US guideline.

Abstract:Many factors affect the safety of high-piled wharf. The traditional safety assessment method for the high-piled wharf mainly relies on the test results of the qualitative analysis, and seldom on the accurate quantitative evaluation. In order to analyze the safety conditions of high-piled wharf accurately, this paper carries out a research on the safety assessment with reference to the safety assessment method for bridges, in which the safety assessment is divided into visual inspection assessment and bearing capacity assessment. Through the fuzzy analytic hierarchy process, the safety degree of the pier is obtained. The method is concise and can reflect accurately the safety situation of the existing high-pile pier. It provides a foundation for the management, maintenance and reinforcement of wharves.

Abstract:To adapting to the hydrological conditions in the Three Gorges reservoir area, the application of new-style overhead vertical wharf with large-diameter pile and span will be a tendency. Taking the Naxigou wharf in Chongqing district as an example, the 3D finite element model for the structure is built by finite element method and then a modal analysis on it is given to study preliminarily the dynamic property of this structure and evaluate the safety of the wharf structure.

Abstract:A reasonable choice of the control strategy for reactive power compensation equipment is the key to the design and operation of reactive power compensation equipment. When the control strategy is not appropriate,problems such as reactive power over-compensation, sub-compensation, etc. will happen. Based on the operation data of a bulk terminal power grid, this paper analyzes the defects of control strategy for the power compensation equipment, and puts forward a reform plan. With a small investment, it can get a great transformation benefit.

Abstract:Based on the analysis of some key technological schemes of Pingtan port area including function orientation, throughput development forecast and selection of initiation project, this paper puts forward new ideas and new methods for solving key problems in the master plan of the newly developed port area, Pingtan port area,which may serve as reference for the master plan of similar projects.

Abstract:The key point of the design of hydrophilic platform is to fully reflect the hydrophilic function and to be harmonious with the adjacent natural landscapes and local culture , as well as to assure the safety of the structure.Based on the case of hydrophilic platform design of Xuhui Binjiang model engineering project in Shanghai, this paper illustrates issues on the general layout, top elevation determination and cross section design in the design of hydrophilic platform, which are the keys to the success of the design.

Abstract:It is one of the important features for cohesive fine sediment that there exist different transport patterns under the effect of the tidal currents. As for the Yangtze estuary, the high-concentrated mud suspension(HCMS) is driven by near-bottom flow with the range from 1 to 2 meters, to which we should pay more attention. The field investigation reveals that the generation of HCMS is related to the settlement characteristics of the cohesive fine sediment in tidal current. The effect of the HCMS movement to the back-siltation in the deepwater channel registers as the water and sediment exchange between channel and shoal. It is estimated that the HCMS transport in the transverse current may increase the amount of the back-siltation in middle of the 12.5 m deepwater channel up to 20 million ~30 milion cubic meters. This would be one of the important factors resulting in backsiltation concentrated in the middle of the north passage.

Abstract:After impoundment of the three Gorges reservoir, obvious changes took place on river bed evolution of the reach in the reservoir area. Based on an analysis of measured data and scour-and-fill variation for many years, we get to know that sediment deposition geometry relates to the river pattern: deposition at the bend or branch reach is serious while that at the straight reach is lower. The analysis presented on river bed evolution of typical river patterns in the upper Yangtze River from Wanzhou to Changjiang reach provides reference for further studies.

Abstract:The Longxikou navigation-power junction on Min river is a comprehensive hydro-junction of navigation combining with hydropower. Because of the importance to Min river navigation, the flow condition during the construction period of Longxikou power station will be directly concerned if Min river navigation channel can meet the transport requirements of the large ship or not. Based on the hydraulic model test, the navigation water condition in each construction period is studied. In some cofferdam sections of the second and the third period of diversion, the condition of navigation flow is very poor. To solve these problems, some comprehensive measures,which improve the navigation flow conditions in the construction period, are proposed. The research result may serve as reference for similar engineering.

Abstract:Usually the bed leveling period after massive dredging period is unavoidable during a dredging project for TSHD, and the efficiency of bed leveling will be quite low, especially for stick clay. Because of the property of stick clay, the difference of the bed will be increased if the shallow points were not eliminated in time,the bed leveling will become even harder for TSHD. In order to solve the problem, we carry out a study, with the help of accurate dredging techniques provided by new supervision technology, the bed leveling period is eliminated, and the dredging efficiency of TSHD is increased.

Abstract:Nowadays, the contradiction between the designed capacity of lockage and the practical capacity in hydro-junction is becoming increasingly prominent. Therefore, this paper combines vessel flow characteristics with three-line rail traffic model in road traffic to solve this problem. Moreover, an organized model for hydrojunction lockage is set up based on the scheduling theory and cellular automata theory. Besides, by simulating the lockage system which consists of two-way navigation lock and ship lift, the pattern of the coming ships is studied to analyze its influences on the converging and diverging ship flow. Finally, a specific analysis is obtained through the simulation results.

Abstract:Aiming at realizing rapidly and accurately inland waterway navigation state monitoring and control, this paper probes into the navigation state data acquisition technologies and comprehensive integrated method based on spatial information technology, GIS (Geographic Information System), and then designs the inland waterway navigation state monitoring and control system to realize omni-directional monitoring and control. It could provide a reference for waterway administrative department to improve navigation support capabilities.

Abstract:This paper analyzes the present manual zonation calculation and conversion methods between the absolute elevation and relative elevation of the inland waterway, proposes the automatic calculation and conversion methods with microcomputer, designs the computing and converting programs on the Windows platform, and compares the data before and after the conversion with different calculation methods, the result of which proves that the method and program presented are accurate and reliable, and are worth popularizing.

Abstract:The paper analyses the method statements of the soil improvement in the reclamation area by the cutter suction dredger. According to the sand analysis, CPT and preliminary dynamic compaction, the combination method of vibro-flotation and dynamic compaction are carried out for different reclamation areas. CPT and in-situ density test are used to verify the densities of the structural fill and the degree of compaction for the first metre thick fill layer respectively after ground treatment. After ground treatment, not only the bearing capacity of the proposed structural fill is increased, but also ground settlement on these locations is limited. The successful implementation of this project provides instructive reference and valuable experience for similar engineering cases.

Abstract:The research on rubble bed stability by ship stern flow is carried out using the physical model. The open-type rectangular pool of 14m long, 8m wide, and 1.2m high is chosen as a test pool, and uniform-sized stones are selected as the test bed rock. We use the submersible pump to simulate the tug propeller jet flow, and control the flow rate of the study area by adjusting different power submersible pump positions. The advanced Doppler-point current meter can measure the flow rate of the base bed riprap leading and trailing edge, and get flow rate indicators which can cause damage to the rubble bed stability. Practical engineering has verified the reliability of the research results.

Abstract:In order to study numerical simulation techniques of pressed pile test and the difference of numerical simulation and field test, based on high-piled wharfs of Zhanjiang port, pressed pile test and numerical simulation of three large diameter steel pipe piles of the two wharfs in this paper. Anchored pile method is used in pressed pile test, and the curves of Q-s and ultimate bearing capacity are attained. Then the three piles are numerically simulated by ABAQUS, and results of numerical simulation and filed test are comparative analyzed. The results show that sedimentation value of numerical simulation is bigger than that of field test in the loading process,the difference value increasing with the increasing of load, and the ultimate difference value of sedimentation is about 20% to 30%.

Abstract:The freeze resistance and resistance to ice force of large cylinder pile and PHC pile, additional measures, overall technological scheme and technique-economics for the application of the above-mentioned two kinds of piles in northern seaport wharves are demonstrated. The results show that if the frost resistance of pile concrete is under control and necessary protective measures are taken for the pile in water level fluctuation area and splash zone, meanwhile the ice-retaining pile skirt, manger board and reinforced concrete parapet wall are used to protect the pile in the exposed aera, large cylinder pile and PHC pile can be used in northern open seaport wharf.Moreover, the application prospect is extensive because of the obvious technological advancement and economic efficiency.

Abstract:Based on the testing report of Zhanjiang harbor 410# berth collision area, we bring out the reinforcement method for the broken pile, pile cap, berthing member and other members in the prerequisite of not damaging the super-structure of the harbor. This reinforcement method has the advantages of time saving, low cost and great social benefit, and thus may serve as reference for relevant reinforcement projects.

Abstract:This paper summarizes the closure construction experience of border dike which is on deep soft soil foundation, and in open sea, deep water, 5 square kilometers reservoir area. The construction makes full use of the permeability of riprap dike and water thrown by large engineering ship, and using horizontal and vertical closure combined technology, heightening the bottom elevation and narrowing vertical width of closure gap. The construction technology not only reduces requirements of the rock size, but also reduces the risk and cost of closure construction.

Abstract:In inland river waterway regulation project, adopting the whole overall-steel-mould slippage technology and craft of belt-machine gating system, the construction of concrete-vertical dock wall is accelerated,which ensures the construction progress and lower the cost. It is a rapid construction technology of safety, quality,efficiency, and low cost, which set an example for related projects.

Abstract:The form of handing point in small concrete structures like the cable trench cover is changed from the ring pull to the bolt connection. Concrete members are manufactured by pre-embedding the nut and then transported and erected by special bolt hanger, which shows obvious advantages in improving the appearance quality of concrete members and avoiding erosion of concrete members induced by ring-pull’s rusting. Meanwhile, it presents a new idea on the form of the hoisting point of concrete members.