天然河道沙波分类研究

A CLASSIFICATION OF SAND WAVE IN ALLUVIAL STREAM

沙波是冲积河流中水流与河床边界相互作用的产物。沙波在与水流、河床边界相互影响的过程中不断地运动和变化。沙波运动是推移质运动的一种主要形式。从微观的角度讲,沙波本身是由一定级配的泥沙组成,追踪沙波表面的泥沙运动表明,泥沙质点在水流作用下,以滚动、滑动、跳跃式运动或悬移、推移相互交替等方式向前运移。

Based on the survey in the field and the analysis of field data,this paper has introduced the concepts of sand wave and its transportation,and discussed the classification principle and then suggested a clssification system of sand wave in alluvial stream. According to the classification,the sand wave in alluvial stream is divided into two grades.The first grade includes two kinds of sand wave and the second includes six.This paper gives respectively definition to each kind of sand wave,descripting its geometrical shape,formation,transportation and so forth,and emphasis to the differentiation,in the first and the second grade of sand wave.