基于无限斜坡模型的山区城镇地质灾害风险评价  

Geological Hazard Risk Assessment of Mountain Town Based on Infinite Slope Model

作　　者：易靖松 张群[3] 张勇 程英建[1,2] 尹国龙[1,2] YI Jing-song;ZHANG Qun;ZHANG Yong;CHENG Ying-jian;YIN Guo-long(Technical Center for Geological Hazard Prevention and Control,CGS,Chengdu 611734,China;Institute of Exploration Technology,CAGS,Chengdu 611734,China;Sichuan Institute of Territorial Space Ecological Restoration and Geological Disaster Prevention,Chengdu 610036,China)

机构地区：[1]中国地质调查局地质灾害防治技术中心,成都611734 [2]中国地质科学院探矿工艺研究所,成都611734 [3]四川省国土空间生态修复与地质灾害防治研究院,成都610036

出　　处：《科学技术与工程》2023年第2期509-517,共9页Science Technology and Engineering

基　　金：怒江流域泸水-芒市段灾害地质调查项目(DD20190643);青藏高原东南缘及过渡带地质灾害调查与风险管控项目(DD20221741);四川省自然资源科研项目(KJ-2022-(18))。

摘　　要：小面积大比例尺的城镇地质灾害风险评价研究一直是地质灾害风险评价研究领域一大难点,选取典型山区城镇作为研究区,基于无限斜坡模型,采用斜坡单元尺度,开展不同降雨工况条件下的地质灾害风险定量评价。在获取研究区精细化的调查数据和雨量数据的基础上,通过皮尔逊模型曲线,查询获得研究区不同降雨工况条件下的设计雨强。随后利用Green-Ampt模型中的非积水入渗部分公式计算不同降雨工况条件下的入渗深度,完成模型参数的赋值。基于ArcGIS平台,将完成赋值的参数图层代入无限斜坡模型对斜坡单元的危险性进行逐坡评价。再将不同工况条件下的危险性评价结果与研究区的易损性评价结果叠加,形成不同降雨工况条件下斜坡单元尺度的风险性评价结果。通过复核验证,本文论述的评价方法在小面积大比例尺的城镇地质灾害风险评价研究具有较高的评价精度,具备可操作性和合理性。The geological hazard risk assessment of large scale and high precision about mountain town has always been a major difficulty in the field of geological hazard risk assessment.Basing on the infinite slope model,a typical mountain towns was choosed as the research area,and carried out quantitative assessment of geological hazard risk under different rainfall conditions with slope unit scale.On the basis of obtaining refined survey data and rainfall data of the research area,the design rainfall intensity under different rainfall conditions in the research area was obtained through Pearson model curve.Then,the infiltration depth under different rainfall conditions has been acquired by he formula of non-water infiltration in Green-Ampt model.At this point,the assignment of model parameters was completed.Based on ArcGIS platform,the assigned parameter layer was substituted into the infinite slope model to evaluate the risk of slope unit.Then,the results of risk assessment under different rainfall conditions and vulnerability assessment area are superimposed to form the risk assessment results of slope unit scale under different rainfall conditions.Through the review and verification,the evaluation method discussed has high evaluation accuracy,operability and rationality in the large scale geological hazard risk evaluation research of small mountain towns.

关 键 词：无限斜坡模型 GREEN-AMPT模型 斜坡单元 

分 类 号：P642.2[天文地球—工程地质学]