基于3S技术的澜石河小流域山洪地质灾害风险评价

Risk Assessment of Mountain Flood Geological Disasters in Lanshi River Small Watershed Based on 3S Technology

以广东省博罗县澜石河小流域为研究对象,以植被覆盖度、土壤松散程度、降雨、坡度、人口土地利用类型和密度(人口密度和土地利用类型)等因子,建立澜石河小流域山洪灾害风险评价指标,采用GIS技术、层次分析法(AHP)建立山洪灾害风险评价模式。在叠加山洪灾害危险性分区图、易损性分区图的基础上绘制出风险区划图,经与历史数据对比,具有较高的吻合度,目的是确定风险等级。结果表明:引入土壤松散程度因子,可精细刻画山洪地质灾害的本质特征,深入挖掘监测系统实时数据,拓宽了山洪灾害转入山洪地质灾害研究的途径与方法。

Lanshi River small watershed in Boluo County,Guangdong Province was taken as the research object. Based on factors such as vegetation coverage,soil looseness,rainfall,slope,population density and land use type,the risk assessment indicators of mountain flood disasters in Lanshi River small watershed were established. GIS technology and Analytic Hierarchy Process (AHP) were used to establish a risk assessment model for mountain flood disasters. The risk zoning map was drawn up on the basis of superposing the hazard zoning map and vulnerability zoning map of mountain flood disasters. Compared with historical data,the risk zoning map has a high degree of coincidence,and the purpose is to determine the risk level. The results show that: by introducing the factor of soil looseness,the essential characteristics of mountain flood geological disasters can be described in detail,and the real-time data of monitoring system can be excavated in depth,which broadens the way and method of studying mountain flood disasters into mountain torrent geological hazards.