在斗槽式预沉池中，异重流现象对泥沙冲淤效果的 影响很大，为使安装斗槽式预沉池达到预期的处理效果，必须很好地了解水流中异重流运动 的有关特性。通过斗槽模型试验，对异重流中水流流速分布、清水分离速度等规律及极限粒 径与泥沙含量的关系进行了试验研究，为较好地解决异重流中泥沙淤积及实际斗槽运行效果 问题提供了重要的试验依据。

There would be a strong influence of density current on efficiencies of scouring and silting in the lateral channel type sediment si lting basin.In order to achieve the desired treatment effect while setting up an anticipatory silting basin,it is necessary to know well the characteristics of dens ity current.By means of model experiments of a scoop channel,the regularities of velocity distributions and separating velocity of clear water,as well as the re lationship of limitrainize(d90) and sediment concentration are stu died.For solving the problems of sedimentation in density flow and practical ope ration effectiveness of scoop channel,it provides important experimental basis.