Shanghai Water Planning and Design Research Institute

Shanghai, China

Shanghai Water Planning and Design Research Institute

Shanghai, China
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Zhang H.-S.,Shanghai JiaoTong University | Wang W.-Y.,Shanghai JiaoTong University | Feng W.-J.,Shanghai Water Planning and Design Research Institute | Yang J.-M.,Shanghai JiaoTong University | Lu S.-Q.,Shanghai Academy of Environmental science
Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE | Year: 2010

A Boussinesq-type wave model is used to investigate the interaction of waves with a non-uniform current field. The numerical model is first tested for wave propagation in a wave flume of uniform depth without current. It is then tested in a wave flume for a submerged bar. The validated numerical model is of higher accuracy than the fully-nonlinear fourthorder model, which is one of the best forms among the existing conventional Boussinesq models that do not incorporate breaking mechanism in one dimension. Comparison of model results with laboratory data shows the model is capable of representing wave-current interactions. The effect of current on wave is studied for different incident wave conditions, and the wave blocking is simulated successfully. Copyright © 2010 by ASME.


Zhang H.-S.,Shanghai JiaoTong University | Wang W.-Y.,Shanghai JiaoTong University | Feng W.-J.,Shanghai JiaoTong University | Feng W.-J.,Shanghai Water Planning and Design Research Institute | And 2 more authors.
China Ocean Engineering | Year: 2010

On the basis of the new type Boussinesq equations (Madsen et al., 2002), a set of equations explicitly including the effects of currents on waves are derived. A numerical implementation of the present equations in one dimension is described. The numerical model is tested for wave propagation in a wave flume of uniform depth with current present. The present numerical results are compared with those of other researchers. It is validated that the present numerical model can reasonably reflect the nonlinear influences of currents on waves. Moreover, the effects of inputting different incident boundary conditions on the calculated results are studied. © 2010 Chinese Ocean Engineering Society.


Zhang H.-S.,Shanghai JiaoTong University | Wang W.-Y.,Shanghai JiaoTong University | Feng W.-J.,Shanghai Water Planning and Design Research Institute | Wang Y.-L.,Shanghai Maritime University | Yang J.-M.,Shanghai JiaoTong University
Journal of Hydrodynamics | Year: 2010

A new type Boussinesq model is proposed and applied for wave propagation in a wave flume of uniform depth and over a submerged bar with current present or absent, respectively. Firstly, for the propagation of monochromatic incident wave with current absent, the Boussinesq model is tested in its complete form, and in a form without the introduction of utility velocity variables. It is validated that the introduction of utility velocity variables can improve the characteristics of velocity field, dispersion and nonlinearity. Both versions of the Boussinesq models are of higher accuracy than the fully-nonlinear fourth-order model, which is one of the best forms among the existing traditional Boussinesq models that do not incorporate breaking mechanism in one dimension. Secondly, the Boussinesq model in its complete form is applied to simulating the propagation of bichromatic incident waves with current present or absent, respectively, and the modeled results are compared to the analytical ones or the experimental ones. The modeled results are reasonable in the case of inputting bichromatic incident waves with the strong opposing current present. © 2010 Publishing House for Journal of Hydrodynamics.


Qian X.,Hohai University | Wu Y.,Hohai University | Lin L.,Shanghai Water Planning and Design Research Institute
Journal of Hohai University | Year: 2015

The interior point path-following method was applied to lower bound finite element limit analysis of the nonlinear programming problem. By applying the subiterative process in the Newton algorithm to solving nonlinear equations, the data storage format and solver of the displacement-based finite element method can be used directly, and large amounts of calculation can be performed element by element. The improved algorithm can be simply implemented with the existing displacement-based finite element program. An example shows that the subiteration algorithm can obtain high efficiency and precision. ©, 2015, Editorial Office of Journal of Hohai University (Nature Sciences). All right reserved.


Huang S.-L.,Hohai University | Xu J.,Shanghai Water Planning and Design Research Institute | Wang D.-G.,Hohai University | Lu D.-Y.,Hohai University
Water Science and Engineering | Year: 2010

By combining computation and observation information, the variational data assimilation method has the ability to eliminate errors caused by the uncertainty of parameters in practical forecasting. It was applied to a storm surge model based on unstructured grids with high spatial resolution meant for improving the forecasting accuracy of the storm surge. By controlling the wind stress drag coefficient, the variation-based model was developed and validated through data assimilation tests in an actual storm surge induced by a typhoon. In the data assimilation tests, the model accurately identified the wind stress drag coefficient and obtained results close to the true state. Then, the actual storm surge induced by Typhoon 0515 was forecast by the developed model, and the results demonstrate its efficiency in practical application. © 2010 Editorial Office of Water Science and Engineering.


Qian Z.,Shanghai Water Planning and Design Research Institute | Tan Q.,Shanghai Water Planning and Design Research Institute | Jia W.,Shanghai Water Planning and Design Research Institute
Advances in Science and Technology of Water Resources | Year: 2015

In order to simulate urban storm water flow and analyze its influence on zonal waterlogging, a hydrological and hydrodynamic model for river networks and a hydraulic model for urban drainage networks were dynamically coupled using the OpenMI technology. Using the Dianbei zone, one of 14 water conservation zones in Shanghai, as an example, a coupled urban storm water model was established. Then, the effect of the combination of different types of rainstorms and tides on zonal waterlogging in the Dianbei zone was analyzed using the model. The results indicate that the model can precisely simulate urban zonal waterlogging in tidal river networks and provide reference for urban flood control. ©, 2015, Editorial Office of Journal of Hohai University (Nature Sciences). All right reserved.


Jia W.,Shanghai Water Planning and Design Research Institute | Li S.,Shanghai Water Planning and Design Research Institute
Applied Mechanics and Materials | Year: 2012

Wind rose analysis method, two dimensional hydrodynamic model and particle tracer model are adopted to systematically study wind field features, flow field variation, and migration, spreading and accumulation processes of the internal and external cyanobacterial boom in Dianshan Lake. The results show that the wind direction in Dianshan Lake varies with seasons; the main wind direction is ESE in summer and autumn, and is NNW in winter and spring. Wind has great effects on the circulation patterns of the lake. In the case of no wind, the lake is mainly influenced by the upstream and downstream flows. River flow enters into the lake during flood tide, while the lake discharges during ebb tide, and there is no circulation occurred; the clockwise and counterclockwise circulations are generated respectively in the north and south of the lake under southeast wind, and similarly for northwest wind only the circulation directions are opposite. Upon different wind and flow fields, cyanobacterial boom is drifting to the windward lakeshore, and is prone to form the algae accumulation area. © (2012) Trans Tech Publications, Switzerland.

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