水利学报Issue(6)：648-656,9.
泥石流堵河条件的研究
Study on conditions of river-blocking due to debris flow
摘要
Abstract
River-blocking due to debris flow is one of the disaster-phenomena happened frequently in the mountain rivers. First, three forms of the debris-flow blocked river, which are the congestion by de⁃bris-flow submerged, the partial blockage and complete blockage, have been observed through tests in the lab. Meanwhile,it is proved that the total amount of debris-flow is an important factor in the river-block⁃ing events. Based on the process of river-blocking obtained by the laboratory tests, dynamic equations for fluid in the confluence area are established. Combining with the Particle-In-Cell (PIC) and Marker and Cell (MAC) method,a coupling model is presented for interaction between debris flow and the main river. The main characteristic of the model is that the rheological parameters and sediment settling velocity in the calculation unit of confluence may be expressed with the aid of the specific weight of mixed fluid. The ma⁃jor factors of debris-flow blocking the main river, such as velocity ratio of debris flow and flow in the main river, rheological parameters of debris flow, the total amount of debris flow etc., are analyzed through numerical simulation. On the basis of inductive analysis of experiment results and simulation re⁃sults, the reasons for using the momentum ratio as the critical condition determining the event of riv⁃er-blocking is explained,and a discriminate index for the river blockage is proposed,which is the product of momentum ratio and volume ratio of debris flow in the river.关键词
泥石流/堵河条件/试验研究/数值模拟Key words
debris flow/conditions of river-blocking/experimental study/numerical simulation分类
天文与地球科学引用本文复制引用
陈春光,姚令侃,刘翠容,杜翠..泥石流堵河条件的研究[J].水利学报,2013,(6):648-656,9.基金项目
国家重点基础研究发展计划（973计划） （）
