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世界地质 2023, 42(2) 399-408 DOI:
ISSN: 1004-5589 CN: 22-1111/P |
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| 基础地质 |
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基于加权信息量法与综合指数法的西安市蒋村街道 地质灾害易发性评价对比 |
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王鑫, 王鲜, 郝业, 胡鹏, 韩秀清, 李博文, 杨亚洲 |
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陕西天地地质有限责任公司, 西安 710054 |
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摘要：
为科学合理进行西安市蒋村街道地质灾害易发性评价, 笔者在蒋村街道地质环境条件与地质灾 害隐患详细调查的基础上, 选取坡度? 坡向? 坡高? 坡型? 地层岩性? 斜坡结构? 距断裂距离? 距道 路距离和植被覆盖度等 9 个评价因子, 通过层次分析法确定各因子权重, 建立了研究区地质灾害易发 性评价指标体系? 基于 GIS 空间分析平台, 分别采用加权信息量法与综合指数法对研究区地质灾害易 发性进行了评价, 结合研究区实际情况和 ROC 曲线对两种方法评价结果进行对比, 结果表明两种方 法评价结果大体一致, 评价精度分别为 92. 6% 和 89.5% , 显示了较高的准确性, 但采用信息量法的 评价结果呈集中连片带状分布, 而采用综合指数法的评价结果聚集程度相对较低? 综合分析认为, 综 合指数法评价结果更符合研究区实际情况? |
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关键词：
地质灾害
易发性评价
层次分析法
信息量法
综合指数法
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Comparison between weighted information and comprehensive index methods on geological disaster susceptibility evaluation at Jiangcun street, Xian City |
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WANG Xin, WANG Xian, HAO Ye, HU Peng, HAN Xiuqing, LI Bowen, YANG Yazhou |
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Shaanxi Tiandi Geology Co., Ltd., Xian 710054, China |
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Abstract:
In order to scientifically evaluate the geological hazard susceptibility of Jiangcun street in Xi??an, the authors have conducted detailed investigation for the geological environment and geohazard conditions at Jiang? cun street. An evaluation index system on geological hazard susceptibility has been developed, which involves 9 factors, including slope degree, direction, height, type, stratum lithologies, slope structure, distance away from fault and road, and vegetation coverage, by determining the weight of each factor using hierarchy analysis method. Based on GIS, the weighted information and comprehensive index methods are used to evaluate the vulnerability of geological hazards in the study area, respectively. The results of the two methods are compared in combination with the actual situation and ROC curve. The results show that the results of the two evaluation methods are basically consistent, with the evaluation accuracy of 92.6% and 89.5% , respectively, showing a high accuracy. However, the evaluation results of the information method are of concentrated and continued distribution features, while the concentrating degree of the comprehensive index method is relatively low. It is concluded that the evaluation results of the comprehensive index method is more consistent with the real situation of the study area. |
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Keywords:
geological hazards
susceptibility assessment
analytic hierarchy process
information quantity method
comprehensive index method
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