人民长江2016，Vol.47Issue(14)：31-35,45,6.DOI:10.16232/j.cnki.1001-4179.2016.14.008
三峡水库泥沙絮凝特征及影响因素分析
Flocculation characteristics of sediment in Three Gorges Reservoir and influential factors analysis
摘要
Abstract
Field measurements are carried out at Miaohe and Fengjie reaches in Three Gorges Reservoir , and the sediments are sampled for the laboratory experiments .The analysis results show that the flocculation phenomenon exists in 99.4% of the 819 measuring points, and the diameter of 83.6%flocs is 3 to 8 times larger than that of the single particle , indicating that the floc-culation is universal under suitable conditions in Three Gorges Reservoir and the critical diameter of the floc is 0.02 mm.In the perspective of the sediment flocculation distribution , the flocculation mainly concentrates in the upper and middle layer of waters , which attenuates along the flow direction , namely the extent of flocculation of Miaohe reach is much smaller than that of Fengjie reach.The critical velocity of flocculation is 0.70 m/s, it is conducive to the formation of sediment flocculation below 0.7m/s. The formation of stable and large floc groups is difficult and weak flocculation is dominant in Three Gorges Reservoir due to the small relative kinetic energy of sediment particles .关键词
泥沙絮凝/泥沙粒径/水流流速/含沙量/三峡水库Key words
flocculation/sediment diameter/flow velocity/sediment concentration/Three Gorges Reservoir引用本文复制引用
何芳娇,吉祖稳,王党伟,夏建新..三峡水库泥沙絮凝特征及影响因素分析[J].人民长江,2016,47(14):31-35,45,6.基金项目
国家“十二五”科技支撑计划项目（2012BAB04B02）；国家自然科学基金项目 （）
