非恒定流清水冲刷输沙规律初步研究  

Preliminary study of bed load sediment transport of unsteady flow

作　　者：程小兵[1] 王艳华[1] 乐培九[1] 

机构地区：[1]交通运输部天津水运工程科学研究所工程泥沙交通行业重点实验室,天津300456

出　　处：《泥沙研究》2011年第3期10-16,共7页Journal of Sediment Research

基　　金：西部交通建设科技项目(200732822471)

摘　　要：通过波动水流及定常流量的清水冲刷水槽试验,对非恒定流输沙特性进行了研究。分析了洪峰过程中,涨、落水流速、比降、输沙率的变化特性及影响输沙率的主要因素;揭示了加速流和减速流的输沙"滞后效应";提出了洪峰输沙量的估算方法以及与洪峰流量输沙等效的"当量流量"。对人造洪峰设计,河床变形分析计算以及河工模型设计等有一定参考意义。Through flume experiment of clear-water scour by fluctuating flows and steady flows,the bed load sediment transport of unsteady flow is studied.The rise and fall of the water velocity during a flood,the gradient,the variation characteristics of sediment transport and the main factors of sediment transport rate in the flood peak process are analyzed.The hysteretic effect of accelerated and decelerating flows on sediment transport is revealed.The estimating method of peak sediment discharge and the ＂equivalent water discharge of sediment transport equal to the peak discharge sediment transport process＂ are proposed,which are of reference to the man-made flood peak design,river bed deformation analysis and computation as well as the river model design.

关 键 词：非恒定流 推移质 输沙律 水槽实验 

分 类 号：TV142.2[水利工程—水力学及河流动力学]