Application of Time Series InSAR Technology in Early Identification of Geological Hazards in the Northern Part of Central Development Zone of Nepal
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摘要: 尼泊尔中央发展区地质灾害频发且危害严重，其东北部山区沟壑纵横，易发山体滑坡与泥石流，西南平原区人类工程活动强烈，极易引发地面沉降。因该区地处境外，人工调查难度较大，适合采用以InSAR技术为主的综合遥感调查方法。为了探索适合该区的地质灾害InSAR 识别方法，采用PS-InSAR 和SBAS-InSAR 两种时序InSAR 技术处理了2018 ~ 2020 年20 期Sentinel-1数据。利用获得的高形变速率区域和高分辨率光学遥感影像，共识别了尼泊尔中央发展区北部27 处潜在的地质灾害隐患点。研究结果表明，PS-InSAR 和SBAS-InSAR两种技术在区域形变速率的监测上具有一致性，形变速率区间在-40 ~ 35 mm/a左右；在研究区这类平原和山区结合的地区，SBAS-InSAR技术能更全面、有效地识别地质灾害隐患点；结合典型隐患点的时序监测曲线，发现区内滑坡隐患的形变特征与季风降雨密切相关，而地面沉降则与人类活动和地下水超采有关。研究结果证明了时序InSAR技术在尼泊尔中央发展区灾害隐患早期识别中的可行性，对于同类地区后续的地质灾害防治工作具有重要的科学支持作用。Abstract: Geological disasters occur frequently and have serious threat in Central Development Zone of Nepal, the northeastern mountainous area of which is riddled with gullies, prone to landslides and mudslides, while the southwestern plains are subject to intense human engineering activities, which can easily cause land subsidence. As the area is located overseas, it is not suitable to do manual survey but adopt the comprehensive remote sensing survey method based on InSAR technology. In order to explore the InSAR identification method of geological hazard in the north of the area, two time-series InSAR technologies, PS-InSAR and SBAS-InSAR, are selected to process the Sentinel-1 data of 20 periods from 2018 to 2020. With the obtained high deformation rate area as the target area, and combined with high resolution optical remote sensing images, 27 geological hazards are identified in the north of Nepal Central Development Region. The results show that there is a certain consistency between PS InSAR and SBAS InSAR in monitoring deformation rate in the region, with a deformation rate range of about - 40~35 mm/a; SBAS-InSAR technology has a more comprehensive and effective effect on identifying geological hazards in such areas where plains and mountains are combined; According to the time series monitoring curve of typical hidden danger points, it is found that the deformation characteristics of all landslide hidden dangers in the area are significantly related to monsoon rainfall, and land subsidence is related to human activities and groundwater overexploitation. The research results prove the feasibility of the time-series InSAR technology in the early identification of overseas geological hazards, which has an important scientific support for the follow-up geological disaster prevention and control of the similar area.
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Key words:
- geological hazards /
- InSAR /
- hazard identification /
- Central Development Zone of Nepal
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