水流挟沙能力及其双值关系分析  

Study on sediment discharge with two-value relationship

作　　者：王延召 张耀哲[1] 叶瑞禄 WANG Yan-zhao;ZHANG Yao-zhe;YE Rui-lu(College of Water Resources and Architectural Engineering,Northwest A＆F University,Yangling 712100,China)

机构地区：[1]西北农林科技大学水利与建筑工程学院

出　　处：《泥沙研究》2018年第5期7-12,共6页Journal of Sediment Research

基　　金：水利部公益性行业专项经费项目(201301016-01);“十二五”国家科技支撑计划项目(2012BAD08B01)

摘　　要：水流挟沙能力对研究河床变形、渠系淤积有着重要作用。根据重力理论,引入能量扩大系数以满足能量平衡,推求得到水流挟沙能力公式,并分析公式中各参量对水流输沙能力的影响。在此基础上,着重讨论了挟沙能力双值关系的存在性以及以往有关双值关系的认识差异。结果表明,挟沙力公式是在冲淤平衡条件下由能量守恒得到的函数关系,并指出浑水性质变化是产生水流挟沙能力双值性的直接原因。根据临界冲淤条件下背景含沙量的不同,明确了水流挟沙能力上下限,并指出这种上下限关系是对平衡挟沙能力的补充,可用于说明挟沙能力＂带状＂分布问题。Sediment carrying capacity plays an important role in the study of river-bed deformation and channel siltation. Based on the gravity theory and energy amplification coefficient,a formula of sediment discharge capacity was introduced. influence of parameters in the formula were analyzed. The two values of sediment discharges were studied. Results show that the formula could be a function of the energy conservation under the equilibrium conditions of scour and deposition. The mechanism is due to change features of muddy water.Based on the different background of sediment concentration under conditions of critical scour and deposition,thus upper-lower limit of sediment discharges were reasonable.

关 键 词：浑水 悬移质 挟沙力 影响要素 双值关系 

分 类 号：TV143.4[水利工程—水力学及河流动力学]