永登县苦水镇潜在地质灾害时空分布特征及易发性与危险性分区评价

以永登县苦水镇为研究对象，充分利用已有资料和野外实地勘察对苦水镇地质灾害的类型、地质条件、发育特征、时空分布规律等进行系统分析。明确了滑坡和不稳定斜坡均为土质斜坡，主要沿东侧黄土丘陵区第一斜坡带成带状分布，具有明显的雨季效应。基于苦水镇地质背景条件，以斜坡作为基本评价单元，分别选取滑坡和不稳定斜坡各自的指标评价因子对其易发性进行分区和评价，进而以易发性分析结果对危险性进行分区评价。结果表明：苦水镇地质灾害易发性可划分为高、中、低及非易发4个分区，面积分别为0.16km2、0.01km2、0.03km2、1.37km2；地质灾害危险性可划分为高、中、低及极低危险4个分区，面积分别为0.118km2、0.035km2、0.031km2、1.386km2。易发性与危险性分区结果与野外实地调查情况相吻合，能够较好地反映区内地质灾害发育的总体特征，这对苦水镇地质危害的预测预警具有一定的指导意义，为甘肃省城镇地区滑坡地质灾害评价和防治提供借鉴。

Temporal and Spatial Distribution and Divisional Evaluation of Susceptibility and Risk of the Potential Geological Hazards in Kushui Town, Yongdeng County

Taking Kushui Town as an object, the types, geological condition, development and temporal and spatial distribution of geological hazards were systematically analyzed, fully utilizing the preexisting data and field investigation. Both landslides and unstable slopes with a band distribution along the first ramp region of the east loess hilly areas belong to soil slopes and have obvious rainy season effect. Based on the geological condition of Kushui Town, using the slope as a basic unit, the slides and unstable slopes were evaluated and divided by susceptibility taking different index respectively, of which the results were used for further division and evaluation by risk. The results show that according to susceptibility the geological hazards in Kushui Town can be divided into four zones: high susceptibility zone, medium susceptibility zone, low susceptibility zone and no susceptibility zone with areas of 0.16km2, 0.01km2, 0.03km2 and 1.37km2, respectively. Instead according to risk, the geological hazards can be divided into four zones: high risk zone, medium risk zone, low risk zone and no risk zone with areas of 0.118km2, 0.035km2, 0.031km2 and 1.386km2, respectively. The division by susceptibility and risk are fit with the field investigation, and can better reflect the overall development characteristics of geological hazards in this area, which has guiding significance for geological hazard prediction and early warning in Kushui Town and provides a reference for geological hazard prevention of urban areas in Gansu.