Author(s): Zheng Jinhai; Yan Yixin; Zhu Yuliang
Linked Author(s):
Keywords: Submerged cross-river tunnel; Three-dimensional hydrodynamic model; Improved Double-Sweep-Implicit method; Tidal curved reach; Transverse flow; Flood control; Boat sailing safety
Abstract: After construction of the pipeline segment of the submerged cross-river tunnel, the level of riverbed is raised in the deep-water side of the curved reach in the Huangpu River Estuary and the bed elevation is then changed. A three-dimensional finite-difference hydrodynamic model is developed to simulate tidal flow of the curved reach with complex bathymetry, and it is applied to evaluate the influence of a submerged cross-river tunnel on the adjacent flow domain. The mode-splitting technique is employed to solve the three-dimensional tidal flow problem. The modified Double-Sweep-Implicit method is adopted to improve the computational stability and accuracy. In order to obtain the satisfactory open boundary conditions, the mathematical models of the East China Sea and the Yangtze Estuary are also established to give a control boundary. Based on the calibration and verification of these models, variable water level and the velocity tensors including the plane velocity field and the vertical transverse flow pattern are studied numerically. It is concluded that the submerged cross-river tunnel has little influence on the flooding control structure and the boat sailing safety, although the longitudinal and transverse flow have some changes, which are favourable for the project.
Year: 2001