期刊
GISCIENCE & REMOTE SENSING
卷 53, 期 6, 页码 671-688出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/15481603.2016.1227297
关键词
land subsidence; small baseline subset interferometry; interferometric point target analysis; land use
资金
- National Natural Science Foundation of China [41130744/D0107, 41171335/D010702, D010702/4140010 982]
- National Basic Research Program of China (973 Program) [2012CB723403]
Land subsidence has been occurring in Beijing since the 1970s. Five major land subsidence areas have been formed: Dongbalizhuang-Dajiaoting, Laiguangying, Changping Shahe-Ba Xianzhuang, Daxing Yufa-Lixian, and Shunyi-Ping Gezhuang. In this paper, we studied on land subsidence in Dongbalizhuang-Dajiaoting and Laiguangying using small baseline subset interferometry and interferometric point target methods of 47 ENVISAT ASAR and 29 RADARSAT-2 data. The results showed that the degree of land subsidence in these areas varied significantly. The mean land subsidence rate ranged from 143.43 to 8.2mm/a and from 132.11 to 7.3mm/a during 2005-2010 and 2011-2013, respectively. We correlated the observed settlement with the land use (agricultural, residential, and industrial). Displacement in the agricultural areas was greater than that in the other areas from 2005 to 2013. Moreover, we compared the observed deformation and the groundwater level in phreatic and confined aquifers. There was a strong correlation between ground subsidence and the groundwater level and the ground settlement increased with a decrease in the groundwater level and the maximum correlation coefficient can reach 0.525. Furthermore, subsidence appeared to be associated with compressible deposits, suggesting that for 90-210-m thick compressible deposits, ground settlement is more likely to occur as the thickness of the compressible layer increases.
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