RISK ASSESSMENT OF GEOHAZARDS BY USING GIS IN GANGU COUNTY, GANSU PROVINCE
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摘要: 在甘肃省甘谷县地质灾害详细调查的基础上, 通过对研究区地质环境条件及地质灾害基本特征分析研究, 选取了历史地质灾害发育程度、地形地貌、工程地质岩组、地质构造、水文条件、植被条件、降雨量、人类工程活动等影响因素, 建立了相应的地质灾害危险性评价指标体系.采用专家评判方法, 基于GIS技术平台, 对甘谷县地质灾害进行了危险性综合评价, 并与定性评价相结合, 最终将研究区划分为高危险区、中危险区、低危险区、极低危险区4个等级, 其中, 高危险区面积为393.19 km2, 占总面积的25.01%, 中危险区面积为544.04 km2, 占总面积的34.61%, 低危险区面积为324.69 km2, 占总面积的20.65%, 极低危险区面积为310.08 km2, 占总面积的19.73%.Abstract: Based on detailed investigation of geo-hazards in Gangu County, the authors made evaluation zoning of geo-hazards risk assessment in Gangu County by using the combined qualitative analysis and quantitative evaluation on the GIS platform. On the basis of comprehensive analysis of the present landslides and geological environment in Gangu County, the authors analyzed the main factors controlling the formation of landslides. These factors involve such aspects as ①geo-hazards historical intensity, ②topography and geomorphic, ③engineering geological layer combination, ④tectonic setting and faults effects, ⑤the degree of vegetation coverage, ⑥the effects of water, ⑦human activities, and ⑧rainfall conditions. With the selected indices quantified according to experts' experience, the index system of geo-hazards risk assessment was formulated. The study area was finally divided into 4 levels of the high-grade area, the medium-grade area, low-grade area, and the very low-grade area. According to the results of landslide hazard zonation, the high-grade area covers 393.19 km2, accounting for 25.01% of the total study area; the medium-grade area is 544.04 km2, accounting for 34.61%;the low-grade area is 324.69 km2, accounting for 20.65%;and the very low-grade covers 310.08 km2, accounting for 19.73% of the whole county.
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Key words:
- Gangu County /
- geo-hazards /
- Geographical Information System /
- risk assessment
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图 2 甘谷县不同工程岩组地质灾害分布略图
Figure 2. Distribution of geo-hazards and engineering rock groups in Gangu County
图 4 滑坡占总数比率与坡度统计图
Figure 4. Map showing the relations between landslide proportion of the total number with slope
图 5 滑坡数量与地形起伏度统计图
Figure 5. Map showing relations between numbers of landslides with terrain range
图 6 地质灾害点密度与工程岩组统计图
岩组种类: 1—坚硬块状岩浆岩、变质岩; 2—中厚层状碳酸盐岩; 3—中厚层软硬相间碎屑岩组; 4—软弱红色岩系; 5—黄土
Figure 6. Map showing the relations between the density of geo-hazards points with rock groups
图 7 地质灾害点密度与断裂带两侧范围统计图
Figure 7. Map showing the relations between the density of geo-hazards points and faults
图 8 地质灾害点密度与道路两侧范围统计图
Figure 8. Map showing the relations between the density of geo-hazards points and roads
表 1 甘谷县地质灾害详细调查点统计
Table 1. Statistics of points of detailed survey of geo-hazards in Gangu County
表 2 地质灾害危险性评价主要影响要素权值表
Table 2. Weight value of mainly influencing factors of geo-hazards
表 3 地质灾害危险因子定性分类标准及赋值表
Table 3. Standards of geo-hazards assessment indicators and valuation grading
表 4 地质灾害危险性程度分区说明表
Table 4. Instructions of zoning of geo-hazards risk evaluation
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