Deformation analysis in the bank slopes in the reservoir area of Baihetan Hydropower Station based on SBAS-InSAR technology
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摘要:
库岸潜在滑坡变形分析是保障国家水利水电设施安全运行的重要环节，针对仅利用单一轨道SAR数据对库岸潜在滑坡变形监测不准确的问题，采用SBAS-InSAR技术，联合升降轨Sentinel-1 SAR数据构建研究区2019年7月至2021年7月的雷达视线方向形变时间序列，并结合无人机野外调查，分析白鹤滩水电站库岸典型潜在滑坡的变形特征。结果表明：（1）受蓄水因素影响，白鹤滩水电站库岸潜在滑坡形变平均增速达10 mm/a以上，库岸稳定性受到破坏；（2）蓄水量变化是当前库岸滑坡发育的关键性诱因，在蓄水和降雨等因素共同作用下，白鹤滩水电站库岸潜在滑坡存在失稳风险；（3）升降轨SAR数据结合的方式能有效克服单一轨道导致的几何畸变等问题，使水电站库岸潜在滑坡变形监测更加准确、全面。研究结果有助于了解库区蓄水对库岸潜在滑坡变形趋势的影响，可为区域尺度防灾应急管理提供科学支持。
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关键词:
- SBAS-InSAR技术 /
- 滑坡灾害 /
- 地表形变 /
- 变形分析 /
- 白鹤滩水电站
Abstract:The analysis of potential landslide deformation on the reservoir bank is an important link to ensure the safe operation of national water conservancy and hydropower facilities. In response to the problem of inaccurate monitoring of potential landslide deformation on the reservoir bank using single-track SAR data only, this paper uses SBAS-InSAR technology to construct the radar line-of-sight directional deformation of the study area from July 2019 to July 2021 by combining elevated-track Sentinel-1 SAR data time series, and unmanned aircraft field surveys were combined to analyse the deformation characteristics of typical potential landslides on the reservoir bank of Baihetan hydropower station. The results show that: (1) under the influence of water storage factors, the average growth rate of potential landslide deformation on the reservoir bank of Baihetan hydropower station reaches more than 10 mm/a. Reservoir bank stability is undermined; (2) water storage changes are the key causal factor in the development of reservoir bank potential landslides at present. The potential landslides on the reservoir bank of Baihetan Hydropower Station are at risk of instability with the joint effect factors such as water storage and rainfall; (3) the method which combined lift-track SAR data can effectively overcome the problems such as geometric distortion caused by a single track, and make the monitoring of potential landslide deformation on the reservoir bank of hydropower station more accurate and comprehensive. The research result can help to understand the impact of reservoir storage on the deformation trend of reservoir bank potential landslides, and can provide scientific support for regional-scale disaster prevention and emergency management.
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表 1 Sentinel-1A数据参数
Table 1. Sentinel-1A data parameters
轨道方向 成像模式 极化方式 波长 波段 入射角/(°) 升轨 IW VV 5.63 C 39.44 降轨 IW VV 5.63 C 39.28 
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表 2 升轨数据库岸形变区域解译结果列表
Table 2. List of interpretation results of shore deformation region in orbit lifting database
编号 形变区域名称 最大形变速率/（mm·a−1） 形变区域类别 H1 观音岩 19.846 潜在滑坡 H2 鱼坝 18.537 潜在滑坡 X1 六城村 76.259 非滑坡形变 X2 半坡 55.947 非滑坡形变
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表 3 降轨数据库岸形变区域解译结果列表
Table 3. List of interpretation results of shore deformation region in orbit descent database
编号 形变区域名称 最大形变速率/（mm·a−1） 形变区域类别 H3 观音岩 10.726 潜在滑坡 H4 清水沟 17.605 潜在滑坡 H5 鱼坝 19.326 潜在滑坡 H6 大湾子 15.888 潜在滑坡 X3 六城村 48.871 非滑坡形变 X4 半坡 61.425 非滑坡形变
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