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国土资源遥感  2019, Vol. 31 Issue (2): 204-209    DOI: 10.6046/gtzyyg.2019.02.28
  技术应用 本期目录 | 过刊浏览 | 高级检索 |
基于时序Sentinel-1数据的锦屏水电站左岸边坡形变探测与特征分析
王振林,廖明生,张路,罗恒,董杰
武汉大学测绘遥感信息工程国家重点实验室,武汉 430079
Detecting and characterizing deformations of the left bank slope near the Jinping hydropower station with time series Sentinel-1 data
Zhenlin WANG,Mingsheng LIAO,Lu ZHANG,Heng LUO,Jie DONG
State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan 430079, China
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摘要 

水电站库岸边坡的稳定性监测是保障大坝安全运行的重要基础性工作,而形变探测是实现边坡稳定性监测的主要途径。星载合成孔径雷达干涉测量(interferometric synthetic aperture Radar,InSAR)技术因其具有观测精度高,可全天候全天时工作的特点,已成为一种重要的形变监测手段。本文采用小基线集时序InSAR技术处理了56景C波段Sentinel-1影像,提取了雅砻江流域锦屏一级水电站库区左岸边坡的形变特征信息。结果表明,锦屏一级水电站上游距离大坝约1.5 km处左岸边坡上存在一处表面积超过75万m 2的大型滑坡体,2015—2018年间最大视线向形变速率超过200 mm/a。形变区主要集中在该岸坡中上部,观测时间段内视线向最大累积形变量超过500 mm,其形变时间序列无明显周期性,基本呈线性滑动趋势。采用同样的方法,对2006—2011年间获取的22景L波段ALOS-PALSAR存档数据进行处理,结果显示在大坝蓄水前,该坡体基本保持稳定。由此推断,库区蓄水造成的大幅水位上升很可能是诱发该滑坡复活的主要因素。

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王振林
廖明生
张路
罗恒
董杰
关键词 锦屏一级水电站形变雷达干涉测量小基线集滑坡哨兵一号    
Abstract

tability monitoring of bank slopes along the reservoirs of hydropower projects is a fundamental task for the safety of dam operation. And deformation detection is a major approach for stability monitoring. Spaceborne InSAR technique has been recognized as an effective tool for deformation detection with its high observation accuracy and capability to work independent of weather and solar illumination. The deformation information of left bank slope of Jinping hydropower station in the Yalong River Basin was obtained by processing 56 images of C-band Sentinel-1 data with small baselines time series InSAR technique. The result indicated that there was a large landslide on the left bank slope about 1.5 km away from the dam upstream of the Jinping I hydropower station, with a surface area of more than 750,000 square meters. The maximum deformation rate in the line of sight exceeded 200 mm/a from 2015 to 2018. The deformation area was mainly concentrated in the middle and upper part of the bank slope. And the maximum cumulative deformation of the line of sight in the observation period was more than 500 mm. The time series of deformation was basically a linear sliding trend without obvious periodicity. The same method was used to process 22 archived images of L-band ALOS-PALSAR data from 2006 to 2011. The results show that the left bank slope was stable before the reservoir impoundment. It is therefore inferred that the sharp rise of water level of the reservoir might be a main trigger factor for this landslide activation.

Key wordsJinping hydropower station    deformation    InSAR    SBAS    landslide    Sentinel-1
收稿日期: 2018-09-20      出版日期: 2019-05-23
ZTFLH:  TP79  
基金资助:国家重点研发计划项目“星载SAR综合环境监测高精度数据处理与反演技术”(2017YFB0502700);国家自然科学基金项目“基于雷达遥感的大型水电工程库岸边坡及大坝稳定性监测方法研究”共同资助(41774006)
作者简介: 王振林(1992-),男,硕士研究生,主要从事InSAR技术在滑坡形变监测中的应用研究。Email: whuwzl@163.com。
引用本文:   
王振林,廖明生,张路,罗恒,董杰. 基于时序Sentinel-1数据的锦屏水电站左岸边坡形变探测与特征分析[J]. 国土资源遥感, 2019, 31(2): 204-209.
Zhenlin WANG,Mingsheng LIAO,Lu ZHANG,Heng LUO,Jie DONG. Detecting and characterizing deformations of the left bank slope near the Jinping hydropower station with time series Sentinel-1 data. Remote Sensing for Land & Resources, 2019, 31(2): 204-209.
链接本文:  
http://www.gtzyyg.com/CN/10.6046/gtzyyg.2019.02.28      或      http://www.gtzyyg.com/CN/Y2019/V31/I2/204
参数 Sentinel-1 ALOS-PALSAR
轨道方向 升轨 升轨
波段/波长/cm C波段/5.6 L波段/23.6
成像视角/(°) 33.6 34
距离向×方位向空间分辨率/(m×m) 5×20 7×10
影像数量/景 56 22
时间跨度 20151026—20180413 20061211—20110206
Tab.1  星载SAR数据参数
Fig.1  星载SAR数据覆盖范围
Fig.2  2种数据集LOS形变速率
Fig.3  2种数据集时序分析所得累积形变序列
Fig.4  Sentinel-1LOS累积形变
Fig.5  2条剖面线高程及累积形变
Fig.6  大气延迟相位与降雨量
Fig.7  累积形变大气校正前后对比
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