高山峡谷地区地质灾害隐患InSAR识别技术对比

Comparison of InSAR Technology for Identification of Hidden Dangers of Geological Hazards in Alpine and Canyon Areas

InSAR技术广泛应用于地质灾害隐患识别,不同InSAR方法具有一定的应用条件和限制因素,而高山峡谷地区地质灾害成灾机制复杂,灾害模式多样,采用一种技术方法往往难以有效识别.采用差分干涉测量(D-InSAR)、永久散射体测量(PS-InSAR)、小基线集测量(SBAS-InSAR)、分布式目标测量(DS-InSAR)和偏移量追踪(Offset-tracking)共5种InSAR技术,以雅砻江沿线西昌区域为研究区开展地质灾害隐患识别,应用不同InSAR技术方法比对分析.共识别28处形变点,其中D-InSAR识别到16处,SBAS-InSAR识别到27处,PS-InSAR识别到3处,DS-InSAR识别到21处,Offset-tracking识别到0处.在高山峡谷地区,SBAS-InSAR技术应用范围最广,识别隐患点数最多,兼顾精确度和效率,能有效识别高山峡谷地区地质灾害隐患.分析在高山峡谷地区使用InSAR技术识别地质灾害隐患的特殊性,针对不同方法技术特点,提出一种在高山峡谷地区使用InSAR技术进行地质灾害隐患识别的技术路线,使得更高效、准确地识别地质灾害隐患.

InSAR technology is widely used in the identification of hidden dangers of geological disasters.Different InSAR methods have certain application conditions and limiting factors.However,the disaster-causing mechanism of geological disasters in alpine and canyon areas is complex and the disaster patterns are diverse,which is often difficult to effectively identify using one technical method.In this paper,differential interferometry(D-InSAR),permanent scatterer measurement(PS-InSAR),small baseline set measurement(SBAS-InSAR),distributed target measurement(DS-InSAR)and offset tracking(Offset-tracking)a total of 5 InSAR technologies,taking the Xichang area along the Yalong River as the research area to identify potential geological hazards,and to carry out comparison and analysis of different InSAR technology methods.The results show that a total of 28 deformation points were identified,of which 16 were identified by D-InSAR,27 by SBAS-InSAR,3 by PS-InSAR,21 by DS-InSAR,and 21 by Offset-tracking 0.In the alpine and canyon areas,SBAS-InSAR technology has the widest application range and the largest number of hidden danger points.Taking into account the accuracy and efficiency,it can effectively identify the hidden dangers of geological disasters in the alpine and canyon areas.Based on the analysis of the particularity of using InSAR technology to identify hidden dangers of geological disasters in high mountains and valleys,a technical route of using InSAR technology to identify hidden dangers of geological disasters in high mountains and valleys is proposed according to the characteristics of different methods and technologies,so as to identify hidden dangers of geological disasters more efficiently and accurately.