摘要
水流挟沙力是悬沙输运计算中非常重要的问题之一,其计算形式常采用基于重力理论的经验和半经验公式。本文针对目前广泛采用的2种挟沙力关系式,选用4组实验水槽数据和2组天然河道实测资料分别讨论其关联性。结果表明,不论指数m在其取值范围内取何值,2个表达式皆存在一定的函数关联性。且当指数m取1和2/3时,直接表现出很强的线性关联。在挟沙力计算中采用流速的平方关系式,物理意义清晰,形式简单。在实际应用时,适当选取系数,挟沙力采用形式简单的平方关系式是完全可行的。
The flow induced sediment carrying capacity is a very important factor for the calculation of suspended sediment transport. Its wildly adopted expressions are mostly experimental and semi-experimental forms based on the gravity theory. By comparing and analyzing 4 sets of experiment data and 2 sets of natural river data, the relation between two kinds of wildly adopted sediment carrying capacity formulae are discussed. The results show that there is a function correlation whatever the power m is. For power m taking 1 or 2/3, the function correlation is the linear correlation apparently. The physical significance of suspended carrying capacity formula related to the quadratic power of current velocity is clear, and its form is simpler comparatively. Introducing the quadratic power expression of sediment carrying capacity with an appropriate proportion factor is doable in practice.
出处
《海洋湖沼通报》
CSCD
北大核心
2009年第1期88-94,共7页
Transactions of Oceanology and Limnology
基金
国家自然科学基金(40476039)资助
关键词
悬沙
挟沙力
含沙量
流速
suspended sediment
sediment carrying capacity
suspended sediment concentration
current velocity
