泥石流堵塞主河条件  

Critical Conditions for Dam-forming due to Injunction of Debris Flow into Mainstream

作　　者：党超[1,2,3] 程尊兰[1,2] 刘晶晶[1,2,3] 

机构地区：[1]中国科学院地表过程与动力学重点试验室,四川成都610041 [2]中国科学院水利部成都山地灾害与环境研究所,四川成都610041 [3]中国科学院研究生院,北京100049

出　　处：《山地学报》2009年第5期557-563,共7页Mountain Research

基　　金：国家自然科学基金(40771024);交通部西部交通建设科技项目(200631879284)~~

摘　　要：分析了泥石流堵河的主要影响因素,包括泥石流与主河流量比,泥石流与主河交汇角,主河宽度,泥石流体的抗冲强度和主河底床坡度。通过对这些主要因素的分析和对比,将这5个主要因素简化为4个无量纲量。针对这些无量纲参数进行了一系列的泥石流堵塞主河试验。对比本次研究和其他文献关于泥石流堵河试验的变量和结果,可以得出无量纲化的泥石流堵塞主河的临界条件。实验结果表明,泥石流堵河的临界值C≥0.87,而且当流量比小于1时难以形成堵河现象。用该堵塞主河的条件能正确判断许多原型泥石流堵塞主河事件。The events of dam-forming due to injunction of debris flow into mainstream often occur in mountainous drainage basin. The critical conditions for dam-forming, mainly including discharge ratio between tributary and mainstream, the confluent angles, width of mainstream, resistance of debris flow against erosion and the slope of mainstream, are discussed herein, and the 5 elements could be simplified by 4 dimensionless parameters throng theoretical analysis. A dimensionless critical index for dam-forming is given on the basis of model test and other documents related to dam-forming and complete blockage in mainstream. The results showed that the critical value of damming was C ≥0.87, and dam-forming process could damming events indicate that the critical index is feasible not occur when the discharge ratio below 1. Historical for most of the documented events of dam-forming .

关 键 词：泥石流 主河 堵塞 堵河判别指数 

分 类 号：D642.23[政治法律—政治学]