摘要
在分析泥沙颗粒含量分布特性的基础上,指出扩散理论能较好地描述主流区的泥沙含量分布规律,但在近底流区由于泥沙碰撞切应力的存在,使得扩散理论不能解释此区域的泥沙含量分布规律.进而在引入颗粒碰撞扩散的基础上,对泥沙颗粒扩散理论进行修正,从而在理论上得到了挟沙水流泥沙含量分布规律的公式.与实测资料对比表明,该公式能更好地描述包含主流区与近底流区在内的泥沙含量分布规律.
Based on the analysis of characteristics of sediment particle concentration distribution, it is pointed out that the diffusion theory can describe sediment concentration distribution in main flow region but cannot explain sediment concentration distribution law near bottom because of the existence of sediment colliding shear stress. By introducing the diffusion caused by sediment colliding, the diffusion theory is revised, and the equation for sediment concentration distribution is derived from theory analysis. Compared with measured data, this equation can describe the sediment concentration distribution better both in main flow region and near-bottom region.
出处
《扬州大学学报（自然科学版）》
CAS
CSCD
2005年第4期75-78,共4页
Journal of Yangzhou University：Natural Science Edition
基金
江苏省高校省级水利动力工程重点实验室开放课题(KJS01060)
扬州大学自然科学基金资助项目(LK051091)
关键词
挟沙水流
含量分布
颗粒切应力
近底流区
扩散理论
sediment-laden flow
sediment concentration distribution
sediment colliding shear stress
near-bottom region
diffusion theory
