南水北调中线工程作为我国特大型线性输水建筑物,保障干渠的安全运营是推进受水区人民生活与经济发展水平的重要措施。利用改进的SBAS InSAR技术,对覆盖南水北调中线辉县段干渠自2015-04-11至2019-03-09的90景Sentinel-1A数据进行高精度处理,得到2015年4月至2019年3月期间辉县段及其周围的形变信息。结果表明:辉县段沉降区域主要分布在辉县市市中心的西南区域和峪河镇的北部区域,干渠基本处于稳定的状态,没有大尺度的沉降漏斗,沿线仅分布着一些小范围的沉降区。结合膨胀土的特性、降雨量和土壤湿度影响因子,进一步对辉县膨胀土渠段进行综合研究,结果表明,辉县膨胀土渠段呈现周期性沉降趋势,并且沉降与降雨量和土壤湿度呈现高相关性。
Abstract
The Central Line Project of South-to-North Water Transfer is a large-scale linear water conveyance building in China. To guarantee the safe operation of main canals is an important measure to promote people's livelihood and economic development in water-receiving areas. In this paper, the improved SBAS InSAR technology was used to process the 90-view Sentinel-1A data covering the main canal of Huixian segment of the Central Line of South-to-North Water Transfer from April 11, 2015 to March 09, 2019. The deformation information of the Huixian segment and its surroundings in the aforementioned time period was obtained. The settlement of Huixian segment mainly distributed in the southwestern area of the city center of Huixian and the northern area of Luohe Town, while the main canals were basically stable with no large-scale settlement funnel and only a few small settlement areas along the line. The expansive soil segment of Huixian County canal was further investigated comprehensively in consideration of expansive soil characteristics, rainfall, and soil moisture. Result demonstrated a periodic settlement trend, and the settlement was highly correlated with rainfall and soil moisture.
关键词
南水北调中线工程 /
时序InSAR /
SBAS /
沉降监测 /
膨胀土渠段
Key words
Central Line Project of South-to-North Water Transfer /
time series InSAR /
small baseline /
deformation monitoring /
expansive soil canal section
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基金
国家重点研发计划项目(2018YFC0406904)
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