NON-OSCILLATORY COMPUTATION SCHEMES FOR VERTICAL PLANE 2-D SUSPENDED SEDIMENT TRANSPORT EQUATION

摘要

The method of fractional steps along the spatial direction is applied to split vertical plane 2-D suspended sediment transport equation into two 1-D advection-diffusion equations. Then two different computation schemes are proposed to solve them. Through comparison and analysis, this paper suggests that: as the advection process is weak in transport, the computation scheme (I) is proper through using a Crank-Nicholson (C-N) implicit difference scheme both in the x and y directions; as the advection process is preponderant in transport, the computation scheme (II) is very reasonable through using an exponential explicit difference scheme in the x direction and the C-N scheme in the y direction, respectively. Experimental results are used to verify two kinds of computation schemes, and good agreements between the calculated and measured results are obtained.