NUMERICAL STUDY ON SHENZHEN RIVER ESTUARINE PROBLEM OF RECLAMATION

摘要

An orthogonal body-fitted finite-difference numerical model which is capable of predicting two-dimensional depth-integrated flow motion and sediment transport process is established and applied to the integral river-estuary-bay water area of Shenzhen region. The Double-Sweep-Implicit finite-difference scheme is adopted to solve the momentum and continuity equations of flow motions. The modified forms of the third-order convection second-order diffusion scheme are used to represent the advective term in solving the advection-diffusion equation for suspended sediment transport. The predicted water elevations, velocities and concentrations are compared satisfactorily with field data. The water elevation and the erosion and/or deposition of river-bed along the Shenzhen river are computed under different combination of hydrometric and topographic conditions. The influence of the partial occupation of river channel due to the reclamation at the Shenzhen river mouth is analyzed, and the destruction of the mangrove owing to the erosion of river-bed near the Shenzhen river estuary is also discussed. Furthermore, the scheme to excavate the range of reclamation is proposed.