论文部分内容阅读
“5·12”汶川地震导致深溪沟流域孕灾环境剧变,泥石流灾害频发,危害严重,亟待对该流域泥石流危险度进行合理有效地评价。以该流域为靶区,应用GIS技术将该流域划分为41个子流域,基于信息熵原理与方法计算41个子流域8个评价因子的信息熵值;根据各因子的信息熵值计算每个因子的权重,进而计算每个子流域泥石流综合危险度指数、判定每个子流域泥石流危险度。将判定结果与应用地貌信息熵法和野外调查结果进行了对比分析,结果表明:本文信息熵法泥石流危险度评价的结果与实际情况吻合较好,可为该流域泥石流防灾减灾、经济建设布局等提供依据。
The “Wenchuan earthquake” caused the catastrophic environment in Shenxigou watershed to change drastically and the debris flow disaster was frequent and devastated. It is urgent to evaluate the risk of debris flow in the watershed reasonably and effectively. Based on GIS, the watershed is divided into 41 sub-basins. Based on the principle and method of information entropy, the information entropy of 8 evaluation factors in 41 sub-basins is calculated. According to the information entropy of each factor, Weight, and then calculate the comprehensive risk index of debris flow in each sub-river basin to determine the risk of debris flow in each sub-river basin. The results of the judgment and the results of field information entropy and field survey are compared and analyzed. The results show that the entropy method of debris flow risk assessment in this paper agrees well with the actual situation, which can be used for disaster prevention and mitigation, economic construction layout Provide basis.