泥石流入汇条件下交汇区的流动特性

根据动量原理,引入了输运流量和淤积流量以及输运率和淤积率等概念,研究了泥石流入汇主河道后,主河道交汇口附近水位壅高以及交汇区泥沙淤积等问题,分析了泥石流进入主河道后流量、容重等的变化。研究了交汇区复杂条件下的动量传递关系,推导了综合反映交汇后下游水力条件关系和交汇区淤积情况的弗劳德数计算公式,并应用试验数据对其进行了验证,结果表明只要参数选取得当,用所提出的公式计算可达到较高的预测精度。

Flow characteristic in conjunction area after confluence of debris flow and main river

Some solid material will deposit in the conjunction area when debris flow is in conjunction with the main river. The transport discharge, deposit discharge, transport ratio and deposit ratio are defined. Based on the momentum theory, we study not only the heading up and sediment deposit principle within the conjunction area but also the varying rule of discharge, density and moment transportation relation within the conjunction area after the confluence. We also deduce the equation of Froude number, which can reflect the hydraulic relation and confluence characteristic in the confluence area after conjunction of main river and branch river. It is verified with the experiment data. If the parameters are used correctly, the calculation value will be very close to the one got through observation.