【摘要】 以汶川地震极震区都江堰深溪沟流域为研究区,在震后孕灾环境分析的基础上,得出该地区泥石流频发的主控因子为丰富的物源条件和易于灾害发生的地形地貌条件,并采用确定性系数CF法,定量分析了复杂地形地貌条件对泥石流灾害的影响程度,确定了该流域最有利于泥石流灾害发生的高程、坡度和坡向范围;并将研究结果和震后丰富的物源条件进行叠加分析,确定了主控因子共同作用下深溪沟流域泥石流灾害最危险的分布区域。研究结果为震后深溪沟流域泥石流灾害频发的成因分析及对震区的泥石流危险性评价和区划、防灾减灾提供依据。更多还原

【Abstract】 Taking Dujiangyan Shenxi gully as the study area,based on the analysis of post-earthquake debris flow hazard inducing environment,the hazard main-control factors including rich material source and susceptible geomorphology condition were determined,and the impacts of the geomorphology condition including elevation,slop and aspect on debris flow were analyzed quantitatively using certainty coefficient method.Overlaid the study results with material source rich areas,the distribution of the most dangerous areas in Shenxi gully basin were delimited under the action of hazard main-control factors.The study results can provide a reference for analyzing the cause of frequent occurrence of debris flow hazards after the earthquake,and have important guiding significance for hazard assessment and zoning,disaster prevention and mitigation as well as economic construction and layout after the earthquake.更多还原