Abstract

Following the analysis of the hydrodynamic and sendimentation characteristics of the Baini Waterway, an orthogonal body-fitted finite-difference numerical model, which is capable of predicting two-dimensional depth-integrated tidal motion and suspended sediment transport, is established to study the engineering feasibility of the navigation channel regulation project. The Double-Sweep-Implicit finite-difference scheme is adopted to solve the momentum and continuity equations of tidal motion. 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 the suspended sediment transport. The predicted water elevations, flow velocities, sediment concentrations and fluvial process are compared satisfactorily with the field data. The water elevation, the flow field and the sediement deposition along the Baini Waterway are computed for four items of the regulation scheme under six kinds of combinations of hydrometric and topographic conditions. The engineering sedimentation method is also used to estimate the sediment siltation intensity, and results reveal that the estimated siltation has the same order with the computed one.

Keywords: navigation channel regulation, numerical model, tidal motion, sediment transport