摘要
地质灾害易发性评价是地质灾害危险性评价及风险评价的基础。本文以斜坡单元为最小评价单元,选取坡度、斜坡结构、工程岩组等8个指标作为评价因子,基于GIS平台采用信息量模型对丹江口库区典型流域开展地质灾害易发性评价,划分出极高、高、中、低4类易发区,分布面积分别为128.67 km^(2)、455.71 km^(2)、622.55 km^(2)和634.77 km^(2),分别占总面积的7%、24.7%、33.8%和34.5%。极高和高易发区主要分布在十堰断裂附近及以北区域,灾害点发育密度高,具带状分布特征。经成功率曲线法检验,评价结果合理,可以为地质灾害危险性评价及精准风险区划提供参考,进而为国土空间规划及风险管控提供重要依据。
The susceptibility evaluation of the geological disaster is the basis for the evaluation of the geologi-cal disaster danger and risk.Taking the slope unit as the smallest evaluation unit,eight indicators such as slope gradient,slope structure,engineering rock group are selected as evaluation factors,and the information content model is adopted based on the GIS platform to evaluate the geological disaster susceptibility of the typical watershed in Danjiangkou reservoir area.Four types of extremely high,high,medium and low suscep-tibility areas are divided,the distribution areas of which are 128.67 km^(2),455.71 km^(2),622.55 km^(2)and 634.77 km^(2)respectively,accounting for 7%,24.7%,33.8%and 34.5%of the total area.The extremely high and high susceptibility zones are mainly distributed near and north of the Shiyan Fault with high disaster development density and zonal distribution characteristics.Tested by the success rate curve method,the evaluation results are reasonable,which is the premise of geological disaster danger evaluation and precise risk zoning,and then provides important basis for land space planning and risk control.
作者
章昱
王磊
伏永朋
刘亚磊
黄皓
ZHANG Yu;WANG Lei;FU Yong-Peng;LIU Ya-Lei;HUANG Hao(Wuhan Center,China Geological Survey(Geosciences Innovation Center of Central South China),Wuhan 430205,Hubei,China)
出处
《华南地质》
CAS
2023年第3期512-522,共11页
South China Geology
基金
中国地质调查局项目(DD20160256、DD20221777)。
关键词
地质灾害
斜坡单元
信息量模型
易发性评价
典型流域
丹江口库区
geological disaster
slop unit
information content model
susceptibility evaluation
typical watershed
Danjiangkou Reservoir area
