颗粒粒度均匀性分布规律的试验研究  

Experimental Study on the Distribution Law of Granule Uniformity

作　　者：周家俞[1] 尹崇清[1] 王召兵[1] 吴门伍 罗剑峰 吴金萍 

机构地区：[1]重庆交通大学西南水运工程科学研究所,重庆400016 [2]珠江水利委员会科学研究所,广州510611 [3]江西省航务勘察设计研究院,南昌330009 [4]长江水利委员会下游水文水资源勘测局,南京210011

出　　处：《中国农村水利水电》2006年第9期25-27,共3页China Rural Water and Hydropower

基　　金："973"项目(2003CB415205);国家自然科学基金项目(50479036);湖北省创新群体基金项目(2003ABA195);博士点基金项目(20020486017)资助。

摘　　要：挟沙水流中的泥沙颗粒运动是随机的,所以在水流中的某一位置的泥沙组成有粗有细,同时不同位置粗细颗粒的均匀程度是不一样的。通过水槽试验研究了不同泥沙浓度及水流条件对泥沙颗粒均匀性沿垂向分布规律的影响,试验表明,在泥沙浓度或者水流条件较小的情况下,非均匀系数沿垂向分布是逐渐增大的,即越接近床面,颗粒越均匀,非均匀系数越接近1.0,然而在浓度较高和水流条件同时作用的情况下,在床面附近出现了非均匀系数最小值。Sediment particles move at random in the sediment-laden flow. Thus, the granule component of the sediment is changing with the proportion of fine and course sediments along the river flow, and the uniformity of these particles is different at different place. In this paper, we have studied the distribution law of granule uniformity along depth under different sediment concentrations, and hydraulic conditions in flume. The results show that when the concentration and the velocity are small, the uniformity increases along the depth, sediment concentration and the hydraulic condition; but when the concentration and velocity are high, the uniformity decreases with the depth.

关 键 词：粒度 非均匀系数 挟沙水流 泥沙浓度 水流条件 

分 类 号：TV149.2[水利工程—水力学及河流动力学]