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首页> 外文期刊>Landslides >Satellite remote sensing-based detection of the deformation of a reservoir bank slope in Laxiwa Hydropower Station, China
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Satellite remote sensing-based detection of the deformation of a reservoir bank slope in Laxiwa Hydropower Station, China

机译：基于卫星遥感的拉西瓦水电站库岸边坡变形检测

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摘要

Laxiwa Hydropower Station is the largest among those hydropower stations in the upper reaches of the Yellow River. The construction started in October 2001, diversion tunnel was finished in January 2004, and impoundment started in March 2009. However, from May 2009, the right-bank slope of the reservoir about 700 m high and 1,000 m wide located 500 m far from the dam was found to be deforming greatly and continuously. Although this slope had been identified as an old landslide, the survey before the construction of the dam concluded that this slope being composed of granite is stable and would be stable even after the impoundment, and thus no detailed monitoring of the slope deformation had been performed before the visible deformation occurred after the impoundment. To indentify the relationship between the deformation of the slope and impoundment, we utilized differential synthetic aperture radar interferometry and Advanced Land Observing Satellite Prism data to analyze the slope deformation before and after impoundment. We found that no identifiable deformation took place before the impoundment, while during the period of 3 April 2009 to 22 May 2010, after impoundment, maximum horizontal displacement reached approximately 7. 5 m. This slope is still deforming even after a total horizontal displacement of several tens of meters being reached, showing high risk of catastrophic failure.
机译：拉西瓦水电站是黄河上游最大的水电站。该工程于2001年10月开始，导流隧道于2004年1月完成，蓄水于2009年3月开始。但是，自2009年5月起，水库右岸约700 m高1,000 m的斜坡位于距水库500 m处。大坝被发现持续不断地变形。尽管该边坡已被确定为旧滑坡，但在水坝建设之前的调查得出的结论是，该边坡由花岗岩构成，即使在蓄水后仍是稳定的，因此没有对边坡变形进行详细监测蓄水后发生可见变形之前。为了确定边坡变形与蓄水量之间的关系，我们利用差分合成孔径雷达干涉测量法和高级陆地观测卫星棱镜数据分析了蓄水前后的边坡变形。我们发现，在蓄水之前没有发现明显的变形，而在蓄水之后的2009年4月3日至2010年5月22日期间，最大水平位移达到了大约7. 5 m。即使在达到几十米的总水平位移之后，该斜坡仍在变形，显示出灾难性破坏的高风险。

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