Journal
GISCIENCE & REMOTE SENSING
Volume 54, Issue 1, Pages 78-94Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/15481603.2016.1257297
Keywords
subway; land subsidence; entropy; InSAR; GIS
Categories
Funding
- National Natural Science Foundation of China [41130744/D0107, 41171335/D010702, 41401492/D010702]
- National Basic Research Program of China (973 Program) [2012CB723403]
- Beijing Municipal Education Commission of China [KM201510028012]
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The underground railway network of Beijing City, China, which is an important urban infrastructure, has burgeoned with the expansion of the city. However, the influence of subway construction and operation on local subsidence has received minimal attention. By analyzing the Radarsat-2 synthetic aperture radar satellite data, and using persistent scatterer interferometry, we revealed the land subsidence characteristics along the Beijing Subway Line 6. In the context of land subsidence, the expectation (Ex) reflects the overall level of local land subsidence while the entropy (En) reflects the degree of nonuniformity of local land subsidence in time and space. By comparing the changes in Ex and En, we estimated the spatial range of the influence of the subway on local land subsidence. The influenced area was mainly located between 60m north of the subway line and 80m south of the subway line. Land subsidence was most strongly altered during subway construction. During operation of the subway, the deformation rates along the subway increased slightly in the first two years and were then stabilized.
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