斜坡结构类型自动化制图方法在休宁县地质灾害风险评价中的应用

Application of the method of automatic mapping of slope structure types in the assessment of geological hazard risks in Xiuning County

斜坡结构类型为岩土体的空间展布状态,岩土体是斜坡的重要物质组成。岩土体的性质、结构、空间分布与产出状态等,在一定的外动力作用下,与地质灾害的形成有着密切的关系,是诱发地质灾害的重要因素之一。本文以休宁县地质灾害风险评价为例,基于ArcGIS的空间分析功能,选择斜坡结构作为评价因子,在对地层产状分区进行栅格化处理,结合数字高程模型获取坡向值的基础上,实现了斜坡结构类型自动化制图,提高了评价精度,为防灾减灾管理、国土空间规划等提供了更精确的数据。

The slope structure type is the spatial distribution state of rock and soil mass, which is an important material composition of the slope. The nature, structure, spatial distribution and occurrence state of the rock and soil mass are closely related to the formation of geological hazards under certain external forces, and are one of the important factors inducing geological hazards. Taking the assessment of geological hazard risks in Xiuning County as an example, based on the spatial analysis function of ArcGIS, we chose the slope structure as the assessment factor, rasterized the zones of occurrences of strata,acquired the values of slope aspects from the digital elevation model, and achieved the purpose of automatic mapping of slope structure types, which improved the assessment accuracy, and provided more accurate data for hazard control and spatial planning of land.