随着我国在南方建造大量的水利水电工程，实践中发现少沙河流泥沙问题亦不少，用以前的物理因素很难解释。主要原因是忽略了少沙河流的絮凝现象。絮凝的根本原因是中国江河大多是碱性水，而河流泥沙主要是从流域冲蚀而来，中国土壤有酸性和碱性之别，在少沙河流中酸性泥沙在碱性水中能起交换质子的中和反应，形成絮凝。 With the construction of a large number of water conservancy and hydropower projects in the south of our country, many problems of sediment in the Shahe River have also been found in practice. It is difficult to explain the previous physical factors. The main reason is to ignore the Shahe River flocculation. The basic reason for flocculation is that most of the rivers in China are alkaline water, and the river sediment is mainly eroded from the river basin. In China, the soil has the difference between acidity and alkalinity. Acidic sediment can play a role in alkaline water in the Shahe River Exchange proton neutralization reaction to form flocculation.