细颗粒对粗颗粒床沙质输沙率影响的初步研究  

Effect of Fine Material on Transport of Bed Material Load in Hyperconcentrated Flow

作　　者：钟德钰[1] 王士强[1] 王光谦[1] 

机构地区：[1]清华大学水利水电工程系,北京100084

出　　处：《水科学进展》2001年第1期1-6,共6页Advances in Water Science

基　　金：国家自然科学基金 !( 598790 0 6) ;高等学校博士学科点基金! ( 59890 2 0 0 )资助项目

摘　　要：考虑高含沙紊流涡团中细颗粒絮凝形成网络结构对粗颗粒运动影响后 ,建立了粗颗粒悬移质泥沙的输沙率计算方法。该方法中包含的细颗粒影响项反映了流域因素对粗颗粒泥沙输沙的影响 ,证明细颗粒的影响是引起多沙河流中“多来多排”现象的一个重要因素。与黄河实测资料的对比表明 ,该计算方法能够反映高含沙紊流输沙时随流域细颗粒增多粗颗粒悬移质输沙率相对增大的现象 。In this paper a transport rate equation of bed material load is proposed with the consideration of the effect of fine material's flocculation. The equation indicates that the transport of suspended bed material load in hyperconcentrated flow can be increased significantly due to the reduced settling velocity and Rouse number by the presence of fine grains generally behaving as wash load. Since the fine material mainly comes from upstream watershed, the introduction of fine material's concentration in the calculation of transport rate of bed material load reflects the impact of watershed on sediment transport. Comparison of field data in the Yellow River and the calculation result of present equation shows that the equation can reproduce the phenomenon that the more the fine sediment comes from upstream, the more the coarse sediment is transported in the Lower Yellow River under the same flow conditions.

关 键 词：床沙质输沙率 高含沙水流 细颗粒 悬移质输沙率 

分 类 号：TV142.3[水利工程—水力学及河流动力学]