EVALUATION OF GEOLOGICAL HAZARD SUSCEPTIBILITY BASED ON GIS AND INFORMATION METHOD: A Case Study of Changjiang County, Hainan Province
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摘要:
海南省昌江县地质灾害的发育受地质环境条件控制和多种外在因素影响.依据昌江县地质灾害详细调查资料，选择各类地质灾害发育的控制条件和诱发因素作为评价指标，通过建立地质灾害影响因子体系，构建信息量分析模型.通过对各项因子进行量化并使其归一化，运用层次分析法确定评价因子权重系数，利用ArcGIS的空间叠加分析功能，实现对昌江县地质灾害易发程度的评价分析.本研究将为昌江县地质灾害预警监测和地质灾害避让搬迁提供依据.
Abstract:The geological hazards in Changjiang County of Hainan Province are controlled by geological environment conditions and influenced by various external factors. According to the detailed investigation data of geohazards in the area, the controlling conditions and inducing factors of various geohazards are selected as evaluation indexes, and the information analysis model is built by establishing the influencing factor system of geohazards. Through the quantification and normalization for each factor, the analytic hierarchy process(AHP) is used to determine the weight coefficients of evaluation factors, and the ArcGIS spatial overlay analysis to evaluate the geohazard susceptibility in Changjiang County. This study will hopefully provide basis for geohazard early warning-monitoring and avoidance-relocation in the area.
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Key words:
- geological hazard /
- susceptibility /
- evaluation factor /
- GIS /
- information method /
- Hainan Province
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表 1 A-B层判断矩阵
Table 1. Judgment matrix of A-B level
A B1 B2 B3 B4 权重 B1 1 1/3 1/5 1/5 0.0687 B2 3 1 1/3 1/3 0.1535 B3 5 3 1 1 0.3889 B4 5 3 1 1 0.3889 
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表 2 B3-C层判断矩阵
Table 2. Judgment matrix of B3-C level
B2 C3 C4 C5 C6 C7 权重 C3 1 3 5 7 5 0.4747 C4 1/3 1 3 5 5 0.2581 C5 1/5 1/3 1 5 3 0.1459 C6 1/7 1/5 1/5 1 1/3 0.0420 C7 1/5 1/5 1/3 3 1 0.0793
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表 3 B4-C层判断矩阵
Table 3. Judgment matrix of B4-C level
B1 C8 C9 权重 C8 1 3 0.75 C9 1/3 1 0.25
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表 4 层次元素组合权
Table 4. Combined weights of elements for each level
层次C 层次B-C 层次C总权重值 B1 B2 B3 B4 0.0687 0.1535 0.3889 0.3889 C1 1 0.0687 C2 1 0.1535 C3 0.4747 0.1846 C4 0.2581 0.1004 C5 0.1459 0.0568 C6 0.0420 0.0163 C7 0.0793 0.0308 C8 0.75 0.2917 C9 0.25 0.0972
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表 5 地质灾害影响因子相对权重表
Table 5. Relative weights of geohazard impact factors
层次 构造C1 岩土体C2 坡度C3 坡高C4 海拔高度C5 植被覆盖率C6 河流C7 工程活动C8 降雨量C9 权重值 0.0687 0.1535 0.1846 0.1004 0.0568 0.0163 0.0308 0.2917 0.0972
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