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泥石流对不同岩性的敏感程度存在很大的差异,而岩性在泥石流相关的科学研究中也难以量化使用。本研究选择三江并流区为研究区,采用工程地质岩组划分方法,将研究区的地质岩性分为14个工程地质岩组;进而引入岩性敏感度计算公式Fn=Nn/Sn,分析研究区泥石流灾害点分布与地质岩组的相关性,计算出泥石流对各地质岩组的敏感值。在ArcGIS 9.0平台的支持下,根据泥石流对岩性的敏感值,将研究区的地质岩性进行量化分级,划分为4个敏感性等级,并将本研究成果应用到三江并流区泥石流危险性评价的应用中。本文选择坡度、岩性、断裂、植被和人类工程活动等5个影响因子为泥石流危险性的评价指标,建立泥石流危险性评价模型,在GIS技术支持下,绘制研究区的泥石流危险性区划图。本研究结果与研究区已有的地质灾害点分布情况基本吻合,充分证明本研究方法是切实可行的,进而可为我国西南地区的地质灾害评价以及防灾减灾工作提供方法指导与参考。
There is great difference between the sensitivity of debris flow to different lithologies, and lithology is hard to quantify in debris flow related scientific research. In this study, the Three Parallel Rivers was selected as the study area, and the geology lithology of the study area was divided into 14 engineering geological rocks using engineering geology group division method. Then the lithology sensitivity formula Fn = Nn / Sn was introduced In the study area, the correlation between the distribution of debris flow hazards and geologic rocks groups was calculated, and the sensitive value of debris flow to each geological group was calculated. With the support of ArcGIS 9.0 platform, according to the sensitive value of debris flow to lithology, the geologic lithology of the study area is quantified and graded, and divided into four sensitivity grades. The results of this study are applied to the risk of debris flow Evaluation of the application. In this paper, five influencing factors, such as slope, lithology, fracture, vegetation and human engineering activities, are chosen as evaluation indexes of debris flow hazard. Debris flow hazard assessment model is established. With the support of GIS technology, the zoning map of debris flow hazard in the study area is drawn. The results of this study are basically in line with the existing distribution of geological disasters in the study area, which fully proves that the method is feasible and can provide guidance and references for geological disasters evaluation and disaster prevention and mitigation work in Southwest China.