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。
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.
出处
《水土保持通报》
CSCD
北大核心
2012年第6期123-128,共6页
Bulletin of Soil and Water Conservation
基金
国家重点基础科学(973)研究发展计划项目"中国西部特大山洪泥石流灾害形成机理与风险分析"(2011CB409900)
国家自然科学基金项目(41072270)
关键词
泥石流
洪峰流量
小流域
雨洪法
debris flow
peak discharge
small basin
flood method
