Abstract
Abstract. To monitor the large area land subsidence in Dezhou city, Shandong province, China. This paper uses 23 scenes of Sentinel-1A radar images from August 2017 to February 2019, and based on small baseline subset (SBAS) technology to obtain the subsidence information in Dezhou urban area. The monitoring results show that: Dezhou city has a serious subsidence phenomenon in large coverage area. A subsidence funnel with Chenzhuang as the center was formed. The average annual subsidence rate (along the vertical direction) of the subsidence center exceeded 45 mm/yr. There was also a serious subsidence phenomenon in the eastern and northeastern parts of the urban area, and there was a tendency of forming a whole area. After detailed data analysis, it is found that the ground subsidence presents seasonal characteristics closely related to the groundwater level and is affected by large-scale engineering construction on the surface.
Highlights
Land subsidence is a common environmental geological problem caused by many reasons, and it belongs to the slow type of geological disasters
The main causes of land subsidence in Dezhou are as follows: (1) Groundwater exploitation: The continuous over-exploitation of groundwater caused by the use of urban residents water, industrial water, and agricultural water around the urban area in Decheng District is the main cause of land subsidence in Dezhou
23 scenes of Sentinel-1A radar images covering the urban area of Dezhou city from August 2017 to February 2019 were used for interference processing using small baseline subset (SBAS) technology
Summary
Land subsidence is a common environmental geological problem caused by many reasons, and it belongs to the slow type of geological disasters. With the rapid development of Interferometry synthetic aperture radar technology, with its large-scale, non-contact, all-weather, high-precision, low-cost advantages, it has effectively made up for the shortcomings of traditional monitoring technologies. It has been widely used in ground subsidence monitoring. 23 scenes of Sentinel-1A data is applied to monitor the ground subsidence in the urban area of Dezhou and its surrounding areas, to obtain the settlement location distribution and deformation rate, and to analyze the spatial distribution of settlement and the influencing factors leading to settlement
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