广西师范大学学报（自然科学版）2025，Vol.43Issue(3)：143-155,13.DOI:10.16088/j.issn.1001-6600.2024082301
基于AHP-信息量模型的桂林市地质灾害危险性评价
Risk Assessment of Geohazards Using AHP-Information Model in Guilin,China
摘要
Abstract
Guilin City,with its many mountains and hills,is a typical karst topography.Due to the complex geological conditions and abundant rainfall,the area frequently experiences geological disasters.This paper selects Guilin as the study area,based on the geological and geomorphological,climatic and hydrological,and human activity factors of geohazards,and selects eight assessment indicators such as elevation,slope,faults,precipitation,water systems,normalized difference vegetation index(NDVI),roads,and land use types to establish an index system for the assessment of geohazards risk in Guilin City.Using the analytic hierarchy process(AHP)and the information model under the ArcGIS platform for data integration,the study area is assessed for geohazards risk.The results show that the proportions of extremely low,low,medium,high,and extremely high risk areas in Guilin City are 22.41%,31.89%,24.43%,14.81%,and 6.45%,respectively.The extremely high-risk areas are mainly concentrated in the southwestern part of Guilin City,such as Yongfu County,Yangshuo County,and the urban area of Guilin;the extremely low-risk areas are mainly distributed in Longsheng County,Ziyuan County,Xing'an County,and other places;the rest of the areas have moderate risk levels,but exhibit a certain spatial differences.The model results indicate that precipitation may be the most important factor affecting the distribution of geohazards risk areas in Guilin City.The model assessment indicator(AUC)has a value of 0.796,which passes the accuracy test for the hazard assessment results.By integrating the natural geographical characteristics of the study area and the mechanisms of how each assessment indicator contributes to disasters,and comparing the hazard assessment results of typical regions,it is found that the high weight of assessment indicators such as precipitation and distance to faults,along with the medium and low weight distribution of other indicators,are quite reasonable.Furthermore,the weighted information quantity of each factor shows good correlation with its grading results,further validating the accuracy of this information quantity model.This study has assessed the impact of various disaster-causing factors on the level of geohazards risk in Guilin in detail and has delineated the geohazards risk areas in Guilin City,which has certain guiding significance for geohazards prevention and control,land use planning,and ecological and environmental protection in Guilin City and other related areas.关键词
地质灾害/危险性评价/AHP/信息量模型/桂林市Key words
geohazards/risk assessment/AHP/information model/Guilin,China分类
地质学引用本文复制引用
吕爽,刘千瑜,张湘如..基于AHP-信息量模型的桂林市地质灾害危险性评价[J].广西师范大学学报（自然科学版）,2025,43(3):143-155,13.基金项目
广西高校中青年教师科研基础能力提升项目(2021KY0063) （2021KY0063）
广西科技基地和人才专项项目(桂科AD22035119,桂科AD21220081) （桂科AD22035119,桂科AD21220081）
