A NUMERICAL MODEL OF SHEET FLOW SEDIMENT TRANSPORT

[摘要] Governing equations are derived for a numerical model to simulate the sediment motion under sheet flow condition. They consist of equations for the conservation of the horizontal momentum, the turbulence energy and the sediment mass. Values of coefficients in the governing equations are determined using the experimental results of Horikawa et al. (1982). The mean sediment transport rates during half a period of sinusoidally oscillatory flow are calculated and the computed values agree well with the experimental results of Sawamoto and Yamashita (1986). Computations are also made for the net transport rate in unsinusoidally oscillatory flow with and without superposed steady flow, showing a good agreement with the measurements of Dibajnia and Watanabe (1992). Finally the thickness of the sheet flow moving layers is computed and related to grain-flow parameters.

[学科分类] 建筑学

[关键词] sheetflow;sediment transport;numerical model