Shanghai Water Engineering Design and Research Institute Co.

Shanghai, China

Shanghai Water Engineering Design and Research Institute Co.

Shanghai, China

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Lu Q.,Shanghai Water Engineering Design and Research Institute Co. | Gong Z.,Hohai University | Zhou Z.,Hohai University | Zhou Z.,University of Auckland | Zhang C.,Hohai University
Shuikexue Jinzhan/Advances in Water Science | Year: 2016

Taking a channel downstream the Sheyang sluice as a prototype, a two-dimensional generalized morphodynamic model is established to investigate the siltation mechanism of a typical channel downstream floodgate in muddy coasts, China. The influence of runoff on hydro-sediment dynamics, as well as the souring and silting evolution in the channel, has been explored with and without considering the change of annual runoff distribution, respectively. A semi-empirical equation describing the relation between the equilibrium discharge and the ratio of runoff volume in flood season, channel averaged cross-section, offshore tidal range, tidal wave deformation, channel length and other related factors is established. For a particular channel which is practically in dynamic equilibrium state of erosion-siltation, the above-mentioned equation can be simplified as a simple form of expression of equilibrium discharge and channel averaged cross-section. And the simplified form of this formula is validated by observational data. © 2016, Editorial Board of Advances in Water Science. All right reserved.


Cui D.,Shanghai Water Engineering Design and Research Institute Co. | He X.,Shanghai Water Engineering Design and Research Institute Co. | Yang H.,Shanghai Water Engineering Design and Research Institute Co.
Advances in Science and Technology of Water Resources | Year: 2014

Considering the fact that quantitative indicator on numerical dissipation is lacking, in this paper the quantitative indicator and research method were given. The method is, namely, using generalized “false diffusive” coefficient of the certain indicators to measure the degree of numerical dissipation of a discrete format. The numerical value of the above method approximately equals to the same effect on the true diffusion of the diffusion coefficient. As to the true diffusion effect, the highly precise numerical value can be approximately obtained by the solution of the pure diffusion formulas. This method was successfully applied to third-order QUICKEST discrete scheme. The overall results show that false diffusion coefficient could be introduced to characterize the numerical dissipation level, whose value can be obtained by comparing the true diffusion effect.


Li L.,Shanghai Water Engineering Design and Research Institute Co. | Zhu J.,State Key Laboratory of Estuarine and Coastal Research
Shuikexue Jinzhan/Advances in Water Science | Year: 2016

According to the field data collected in the Changjiang Estuary in December 2011 and January 2012, there was a freshwater extension from the North Channel (NC) to the mouth and lower reaches of the North Branch (NB) where the water salinity was decreased during spring and the subsequent middle tides. However, the phenomenon was absent during the neap tides and subsequent middle tides. To reveal the origin of the freshwater in the lower reaches of the NB, We employed the well validated 3-D numerical model to reproduce the observed phenomenon. The numerical experiments were conducted and the freshwater flux decomposing method was used to investigate the underlying dynamic mechanism of the freshwater extension. We found that the freshwater in the NC extends to the NB mainly through its northern outlet (NONC) and neighboring shoals during spring and the subsequent middle tides due to the Lagrangian transports. Deepening of NONC facilitated the freshwater extension, and hindered the saltwater intrusion into the NB. In the contrast, the high-speed northerly winds would restrict the freshwater extension, while assist the saltwater intrusion into the NB. © 2016, Science Press. All right reserved.


Gan L.,Hohai University | Shen Z.Z.,Hohai University | Yan Z.Q.,Hohai University | Ren H.C.,Shanghai Water Engineering Design and Research Institute Co.
Advanced Materials Research | Year: 2014

For the leakage problem caused by geomembrane defect, the unstable saturated-unsaturated seepage theory and Galerkin finite element method have been adopted. So a three-dimensional finite element numerical model of an earth-rock dam with geomembrane anti-seepage system is simulated by the unstable saturated-unsaturated seepage finite element method. The influnence on seepage field for the varying degrees of geomembrane damage is analyzed, and the overall and local seepage field characteristics of the dam for geomembrane defect leakage are discussed. The results show that the numerical method provides an effective way to study the leakage problem of geomembrane defect. © (2014) Trans Tech Publications, Switzerland.


Yuan R.,East China Normal University | Wu H.,East China Normal University | Zhu J.,East China Normal University | Li L.,Shanghai Water Engineering Design and Research Institute Co.
Journal of Marine Systems | Year: 2015

A three-dimensional numerical model was used to study the response time of the Changjiang (Yangtze) River plume to river discharge by artificially increasing the runoff over a short period and investigating the variation of salinity in the plume region. The time lagged between the change of river discharge and the change of salinity that reaches the 10% of the adjusted value is considered as the response time in this study. The response times in the plume region differed slightly when the river discharge during the spring tide and the neap tide was increased. Specifically, the response times near the river mouth and in the plume edge were ~. 1. days and more than 15. days, respectively. The brackish water volumes were also calculated to determine the variations in the plume extensions over time. A tracer was released to study the transport time from the Datong station to the East China Sea using the concept of water age. The tracer transport time ranged from 10. days near the river mouth to more than 50. days at the edge of the plume, which is much longer than the response time of the surface salinity. © 2015 Elsevier B.V.


Chen F.,Shanghai Water Engineering Design and Research Institute Co.
Advances in Science and Technology of Water Resources | Year: 2014

In the past years, there were some key technical problems in reinforcement of flood wall, such as ambiguous causes in analysis of dangerous situations, no unified standards for flood defense, contradictions of planning standards and current situations, mismatches of protective standards and urban development, unreasonable reinforcement scale, etc. In this paper, the examples of risk situations are collected to analyze the main factors that lead to the mentioned problems. Firstly, we present a study of the relationships among these various factors and then contrast planning standards with present status. In addition, further researches have been done which deconstruct the contradictions in current protected standards and analyze the reasons of unreasonable proposed scale for the reinforcement of floodwall. Main reasons of the dangerous situations include boundary conditions change, illegal operation of vessels, structural safety deficiencies, land subsidence, and engineering impact caused by projects that are adjacent to or pass through rivers. Various dangerous situations are caused by one or more factors; thus in order to raise the security levels in upstream regions, the standards of protection should be checked from overall defense standards which have been corrected by measured hydrological data. Furthermore, for ascertaining the principles of project scale of reinforcement, working conditions, hydrological features, the dangerous situation and the planning or standards evolution should be taken into account. At last, restrictive conditions should be settled on the shoreline of dock and ship lock. ©, 2014, Advances in Science and Technology of Water Resources. All right reserved.


Zhao G.,ShangHai Water Engineering Design and Research Institute Co. | Li Y.,ShangHai Water Engineering Design and Research Institute Co. | Cui D.,ShangHai Water Engineering Design and Research Institute Co. | Du X.,ShangHai Water Engineering Design and Research Institute Co.
Advances in Science and Technology of Water Resources | Year: 2016

In order to determine the defensive capability of the downtown section of flood wall in Shanghai along the Huangpu River, using monitoring data of flood wall elevation from 2012 and design parameters of the flood wall along the Huangpu River, the Monte Carlo method was applied to calculate the overtopping probability of the flood wall with different tide levels under the current conditions and future conditions of sea level rise, propose evaluation criteria for overtopping risk analysis of the flood wall, and quantify the corresponding overtopping risk. The results show that the current defensive capability of the flood wall is clearly insufficient and Huangpu River flood prevention is inadequate considering the rising water level of the Huangpu River in recent years and the continuing sea level rise that will occur in the future. The high-risk area of overtopping is concentrated upstream of the downtown section of the flood wall. The overtopping risk of the flood wall is related not only to the lack of elevation but also to different designed tide levels adopted in different sections. © 2016, Editorial Office of Journal of Hohai University (Nature Sciences). All right reserved.


Wang L.-J.,Shanghai Water Engineering Design and Research Institute Co. | Li R.,Shanghai Water Engineering Design and Research Institute Co. | Lu Y.-J.,Shanghai Water Engineering Design and Research Institute Co.
Yantu Lixue/Rock and Soil Mechanics | Year: 2012

In engineering practice design parameters of drainage mats for consolidation method, such as drainage mat thickness, permeability coefficient, etc, are highly related to engineering experience. Silty sand is not recommended for drainage mat by engineering design specifications. Based on the prototype measurement of a certain reclamation project in Shanghai, characteristics of silty sand drainage mats of sea dike on muck foundation are studied via nonlinear FEM; and the impact of key factors on consolidation, such as mat permeability coefficient, mat thickness, mat length and relative permeability of body, etc, is further studied. On that basis, it is put forward that using transmissibillity coefficient of drainage mat as control parameter for design. Thus, the relating design formula for drainage mat, covering those factors, is presented accordingly; and it provides technical support for the design of drainage mat by using silty sand instead of medium sand or coarse sand. It is found that using silty sand to construct drainage mat is feasible in some project.


Liu X.,Shanghai Water Engineering Design and Research Institute Co. | Du X.,Shanghai Water Engineering Design and Research Institute Co. | Lu Y.,Shanghai Water Engineering Design and Research Institute Co. | Pan L.,Shanghai Water Engineering Design and Research Institute Co.
Proceedings of the 11th (2014) Pacific/Asia Offshore Mechanics Symposium, PACOMS 2014 | Year: 2014

Shanghai is the most important coastal city in eastern China, the main area that will be influenced by the north pacific tropical cyclones. To protect the city from direct invasion of storm surge, 532 km seawalls have been built along the Changjiang Estuary and Hangzhou Bay area. They are the first promising barrier to Shanghai's safety from tidal flood. Currently, the standard for the dike design in Shanghai is mainly of 200 years return period in tide level combined with force 12 wind, with the world climate change and frequent severe weather, the safety of dike structure under the excessive storm surge, if happens, is the most concern by city managers. A 7.0km long dike at the junction of Changjiang Esutary and Hangzhou Bay is chosen to be studied here. A typhoon route which may have negative effect on the dike is given after some numerical simulation. By using storm surge model and typhoon-generate wave model, tide level before dike, wave force and wind speed are calculated under the conditions of severe typhoon (40 m/s at center) and super typhoon (60 m/s at center) with the selected route. According to the tide level and wave conditions of these excessive storm surge in the seawall of Lingang, the feature of armored structure, seawall stability and anti-scouring ability of back-slope from overtopping are studied. The result shows, the No. 9711 typhoon route with a 1.5 degree latitude translation to the north will be the most harmful to the research area and two different typhoon intensities are set on this rout, separately the intensity equal to No. 9711 as severe typhoon and No. 5612 as super typhoon. Under the condition of severe typhoon, the highest tidal level can be 6.74 m (Shanghai Wusong Datum) and the average wave height be 2.99 m, with the condition of super typhoon separately be 7.68m and 3.50 m. Under the severe typhoon, the fence board thickness on current seawall, single wing shape block weight and the overall anti-slipping are all satisfy the stability condition, but the anti overturning stability is dissatisfy, and wave overtopping exceed to the normal extent, as a result the back-slope can easily be scoured. Under the super typhoon, fence board thickness approaches to critical number, other indicator such as single block weight, anti-slipping, anti-overturning are all dissatisfy the stability condition. Also, the overtopping extremely beyond the normal extent and the back-slope can be easily scoured. In this paper, we also present some advanced advice to deal with excessive typhoon. Copyright © 2014 by The International Society of Offshore and Polar Engineers.


Cui D.,Shanghai Water Engineering Design and Research Institute Co. | Liu X.,Shanghai Water Engineering Design and Research Institute Co.
Proceedings of the 11th (2014) Pacific/Asia Offshore Mechanics Symposium, PACOMS 2014 | Year: 2014

Due to dispersive errors, numerical dissipation of the advection terms may have a great influence on numerical solution accuracy of advection-diffusion issue. It is necessary to grasp numerical dissipation level before putting some scheme into use. Considering the lack of quantitative indicator on numerical dissipation, the quantitative indicator and research method were established in this paper. The method was successfully used to study the false diffusion law of QUICKEST discrete scheme and guild how to choose an appropriate discrete scheme in numerical simulation of salinity of Yangtze river estuary. The results show that the false diffusion coefficient could be applied to characterize the numerical dissipation level. The value of the false diffusion coefficient can be obtained according to the true dispersion effect. Copyright © 2014 by The International Society of Offshore and Polar Engineers.

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