Risk analysis of land subsidence in Hexi area in Nanjing based on multi-source data

doi:10.13474/j.cnki.11-2246.2019.0369

Abstract

Abstract: Risk assessment of land subsidence is of great significance to urban public safety. In this paper, InSAR subsidence, geological data are combined to evaluate the risk of land subsidence in Hexi in Nanjing. Firstly, the subsidence information obtained by InSAR is used to establish a three-level multi-factor land subsidence risk assessment system by using analytic hierarchy process(AHP) in combination with the soft soil thickness, land use type, ground elevation and rail transit distribution information. Then, the risk degree of land subsidence is analyzed. Finally, the subsidence risk of rail transit is analyzed emphatically. The results show that the spatial characteristics of land subsidence risk in Hexi are obvious. The high-risk areas are mainly distributed in Jiangdong street, Fenghuang street and Mochouhu street with an area of about 6.4 km², among which the land subsidence risk of metro line 2 is relatively high.

Key words: land subsidence, risk assessment, AHP, rail transit, multi-source data

CLC Number:

P258

ZHANG Peng, ZHU Bangyan, SUN Jingwen, WANG Xiao. Risk analysis of land subsidence in Hexi area in Nanjing based on multi-source data[J]. Bulletin of Surveying and Mapping, 2019, 0(11): 141-144.

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Risk analysis of land subsidence in Hexi area in Nanjing based on multi-source data

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