Modified Method for Peak Discharge Calculation of Debris Flows in Southwest Area of Tibet

HUANG Kai; CHEN Xiao-qing; LI Qiang; YANG Dong-xu

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Modified Method for Peak Discharge Calculation of Debris Flows in Southwest Area of Tibet

- Modified Method for Peak Discharge Calculation of Debris Flows in Southwest Area of Tibet
- Bulletin of Soiland Water Conservation Vol. 31, Issue 6, Pages: 123-128(2012)
- 作者机构：
  
  1. 中国科学院山地灾害与地表过程重点实验室
  2. 中国科学院水利部成都山地灾害与环境研究所
  3. 中国科学院大学
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：2012
- 稿件说明：
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HUANG Kai, CHEN Xiao-qing, LI Qiang, et al. Modified Method for Peak Discharge Calculation of Debris Flows in Southwest Area of Tibet[J]. Bulletin of Soiland Water Conservation, 2012, 31(6): 123-128.
DOI：

HUANG Kai, CHEN Xiao-qing, LI Qiang, et al. Modified Method for Peak Discharge Calculation of Debris Flows in Southwest Area of Tibet[J]. Bulletin of Soiland Water Conservation, 2012, 31(6): 123-128. DOI：

摘要

在西藏地区泥石流野外调查中发现

泥石流形成区下限下延至流域中游、流通区沟道形态复杂、沟道交汇等现象明显。因此

基于全流域特征参数的雨洪法计算难以得到准确的泥石流设计参数。针对此类泥石流沟道

采用了子流域叠加雨洪法计算的方法。以西藏山南地区某泥石流沟为例

针对支沟面积>25%的沟道进行了计算和讨论。利用三角形概化泥石流流量过程线

计算了交汇后主沟泥石流的洪峰流量。比较了全流域雨洪法和划分子流域雨洪法的计算结果

认为子流域法能更准确地反映支沟泥石流在整个流域内的影响和作用

可为防治工程设计提供参考。

Abstract

Debris-flow valleys in Southeast Tibet were found distinct in their channel structure.The source area of debris flow usually extends to the middle reaches

with cross and confluence of the channels.The traditional method based on the full-valley parameters is inadequate to provide accurate parameters for engineering designs.We proposed a new method to calculate the peak discharge of debris flow.Based on field survey in Shannan Prefecture of Tibet

a traditional valley was measured.We calculated the hydrograph with the triangle model and concentration time of sub-basins with large areas(25% of full-valley area)

and then obtained the converged hydrograph and corresponding peak discharge

which is amended by the concentration times of two sub-basins.Comparing the results of the full-valley method and the proposed new method

we concluded that the proposed method accurately captured the contribution of dynamic sub-basin discharges and is of greater applicability.

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