摘要
本文通过理论分析和实验研究，探讨了支沟泥石流到达主流汇流部后的特性，建立了汇流部泥石流龙头的运动轨迹方程式．根据泥石流在汇流部的淤积状况，将其特性大致分为如下３种类型；１）ＴＹＰＥ１．泥石流的泥沙全部停积在汇流部；２）ＴＹＰＥ２．支沟泥石流进入汇流部后，部分泥沙淤积在汇流部而继续流向下游；３）ＴＹＰＥ３．支沟泥石流在汇流部不发生淤积而通过汇流部流向下游．在探讨泥石流堆积扇的最终堆积坡度和汇流部泥石流浓度计算方法的基础上，给出了上述分类的条件及支沟泥石流堆积扇堵塞主流河道形成天然坝的条件；并提出了计算ＴＹＰＥ１的泥石流堆积扇形状的数学模型．
In this paper,the behaviors of debris flow which comes out of a tributary at the confluencehave been discussed by means of theoretical analysis,experimental investigation and a system ofequations predicting the travelling locus of the front for tributary debris flow and in the mainchannel.According to the sediment deposit situations of the tributary debris flows at junctionarea,the behaviors can be classified roughly into three main categories.1)TYEP 1:when the tributary debris flow moves into the main channel then stops and deposits within the junction area;2)TYPE 2:the tributary debris flow leaves some deposits at the confluence and continuesmoves down;3)TYPE 3:the tributary debris flow passes through the junction area without any deposition.The conditions to identify each type are given, the formation condition of the debris dam issuggested,and also,a simple method to predict the shape of debris cone formed at the junction isproposed for TYPE 1 deposition.
出处
《泥沙研究》
CSCD
北大核心
1995年第1期1-15,共15页
Journal of Sediment Research
