漫滩洪水悬移质输移的探讨

Investigation on Nonequilibrium Sediment Transport in Overbank Flow

本文对天然冲积河流滩地与河槽的平面形态进行了概化,分析了入滩含沙量与河槽含沙量的关系,提出了滩槽泥沙交换的两种模式,并以非均匀沙床沙上扬规律为基础,导出了漫滩洪水河槽非均匀悬移质含沙量的微分方程,对方程解进行了分析和讨论.以此为基础建立了漫滩洪水悬移质输移的计算方法,验证结果表明,计算成果与实测符合较好.

Based on the schematized geometry of main channel and flood plain the paper suggests two patterns of suspended sediment interchange between main channel and flood plain and analyzes the relationship between the sediment concentration of main channel and that flowing into the flood plain. The nonuniform sediment interchanges at the channel bed are described. The differential equation of suspended sediment concernt-ration in main channel is derived and the solutions to the. equation are discussed. The calculated results are compared with river data and generally good agreement is obtained.