基于InSAR技术的伊宁县滑坡早期识别

    Early identification of landslides in Yining County based on InSAR technology

    • 摘要: 针对伊犁地区受冻融作用和降水影响致使境内滑坡灾害频发的现状,本文以伊宁县为研究对象,联合2020年1月至2021年12月的Sentinel-A数据和2016年5月至2020年5月的ALOS-2数据,采用Stacking-InSAR技术和SBAS-InSAR技术获取研究区地表形变信息,结合光学遥感解译共识别潜在滑坡418处,并对典型地质灾害区域滑坡识别结果进行了野外验证。分析两种时序InSAR技术的优缺点,构建了伊宁县滑坡InSAR早期识别方法。引入降水量数据结合伊宁县气候特征对胡吉尔特滑坡群时空演化特征进行分析,推断可知冻融作用和降雨为区内滑坡灾害的主要诱发因子,且冻融期形变速率大于降雨期。区内滑坡主要分布在坡度10°~30°,坡向以阴坡为主,距断裂带小于5 km的互层状较软弱以砂岩、砾岩、砂砾石和亚砂土为主的岩组。研究结果表明了InSAR技术识别伊宁县滑坡的可靠性,可为当地灾害防治提供技术参考和科学依据。

       

      Abstract: Aiming at the current situation of frequent landslide disasters caused by freeze-thaw action and precipitation in Yili area, this paper takes Yining County as the research object, combining the Sentinel-A data from January 2020 to December 2021 and the ALOS-2 data from May 2016 to May 2020, using Stacking-InSAR and SBAS-InSAR technology to obtain surface deformation information in the study area, combined with optical remote sensing interpretation to identify 418 potential landslides, and field verification of landslide identification results in typical geological disaster areas. The advantages and disadvantages of the two time-series InSAR technologies are analyzed, and an InSAR early identification method for landslides in Yining County is constructed. The temporal and spatial evolution characteristics of the Hujierte landslide group are analyzed by introducing precipitation data combined with the climate characteristics of Yining County. It is inferred that freeze-thaw action and rainfall are the main inducing factors of landslide disasters in the area, and the deformation rate during the freeze-thaw period is greater than that during the rainfall period. The landslides in the area are mainly distributed on slopes of 10°-30°, the slope aspect is mainly shady slope, and the interbedded relatively weak rock groups less than 5 km away from the fault zone are dominated by sandstone, conglomerate, sandy gravel and sandy soil. The research results show the reliability of InSAR technology in identifying landslides in Yining County, which can provide technical reference and scientific basis for local disaster prevention and control.

       

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