基于地理探测器的岷江上游泥石流影响因子相对重要性分析

结合GIS和RS技术,应用地理探测器方法定量分析岷江上游土壤类型、坡度、年降雨量、植被密度、地层岩性等9个影响因子在泥石流活动中的作用及相互作用关系.结果表明:泥石流具有空间异质性,对泥石流贡献率大于10%的主要影响因子有年降雨量、坡度、距断裂带距离、植被密度和土地利用类型.交互作用探测表明9个影响因子间的交互作用主要是非线性增强,其中年降雨量、距断裂带距离和坡向3种影响因子对泥石流的交互作用较强.

Relative Importance Analysis of Debris Flow Influence Factors Based on Geographical Detectors: a Case Study in the Upper Reaches of Min River

Combined with GIS and RS technology, the geo-detector method was used to analyze quantitatively the effects and correlations of nine influencing factors such as soil type, slope and annual rainfall, vegetation density and stratum lithology for the debris flowin the upper reaches of Min River. The results show that the debris flow has spatial heterogeneity, and the main influencing factors for the contribution rate of debris flow greater than 10% are annual rainfall, slope, distance from fault zone, vegetation density and land use type. The interaction detection shows that the interaction between the nine influencing factors is mainly nonlinear enhancement, and the interaction effects of annual rainfall, distance from the fault zone and slope direction on the debris flow are stronger.