Influence of estuarine reclamation on flood control capacity of Shenzhen River regulation project

摘要

For study on the possible influence of estuarine reclamation upon the flood control capacity of the Shenzhen River Regulation Project, a 2-D finite difference hydrodynamic model in an orthogonal boundary-fitting curvilinear coordinate is developed and applied to the integral river-estuary-bay water area of Shenzhen region. The hydrodynamic effects of flooding water into swamps and creeks of a large-scale mangrove forest and the momentum transfermechanism at the interface between main channel and flood plain flows are taken into account. The Manning roughness coefficients and the depth averaged eddy viscosity coefficients in the mangrove swamp and creek and in the compound channel are treated with different methods. Two test cases demonstrate that the present model is efficient and applicable. The detrimental effect of the estuarine reclamation is evaluated. The optimum scheme to excavate the range of reclamation is proposed on basis of the flood defence requirements of both Shenzhen and Hong Kong.