水库下游冲刷的数值模拟—模型的检验

Numerical Simulation of Degradation Downstream of a Reservoir——Model Verification

文献[1]建立了水库下游冲刷的一维数学模型,模型考虑了非均匀悬移质不饱和输移、非均匀沙推移质输移及床沙级配的调整。本文利用系统的水槽试验资料及汉江丹江口水库下游、长江葛洲坝下游冲刷资料对文献[1]提出的模型进行了全面检验,检验结果表明,计算的冲淤量及沿横断面分布、出口断面含沙量过程、推移质输沙率、各河段床沙粗化过程及水位过程均与实测资料吻合较好。

A 1-D mathematical model was established in reference[1], in which the non- uniform suspended load transport, the non-uniform bedload transport and sorting of the bed material are considered. The model was tested by systematic flume experiment data, the data of twenty eight- year degradation of Hanjiang river from Huangjiagang to Hauangzhuan downstream of Danjiankou reservoir, and the data of seven-year degradation of Yangtze river from Yichang to Chenjiawan downstream of the Gezhouba project. The calculated results show that the erosion and deposition discharge, its distribution along the cross section, the water level process, the suspended load concentration at the exit, the bedload transport rate and the process of armoring of the bed material are in close agreement with the experimental and field results.