Spatial-temporal Evolution Characteristics of Land Subsidence and Ground Fissure Using SBAS-InSAR: a Case Study of Yuhua Village in Xi’an City
Jiewei ZHAN1#+, Yuemin SUN2, Quanzhong LU2
1Chang’an University, China, 2College of Geological Engineering and Geomatics, Chang’an University, China

Since the late 1950s, Xi'an City has suffered from serious land subsidence and ground fissures, which seriously restricted the urban construction and development planning of Xi'an City. In this paper, Yuhua Village, one of the typical land subsidence areas in Xi'an City, is taken as the research area. Based on the SBAS-InSAR technique, three kinds of satellite data (ERS, Envisat, Sentinel-1a) covering the study area from 1992 to 2020 are used. Combined with the drilling data, the history and current situation of urban underground water exploitation and development, this paper analyzes the temporal and spatial evolution characteristics of land subsidence and ground fissures around Yuhua Village, and discusses the genetic mechanism of land subsidence and ground fissures. The main results are as follows: annual deformation rate maps in Yuhua Village and surrounding area from 1992 to 2020 are obtained, and the subsidence center changes from the electronic city (90 mm/a) in the 1990s to the Yuhua Village (50 mm/a). There is a correlation between land subsidence and ground fissures in space-time distribution, and the ground fissures are exposed in the north edge of the ground subsidence trough, and expand according to the development of the ground subsidence trough. The subsidence center of Yuhua Village is still expanding, and the f4 ground fissure may extend westward. The development of ground subsidence and ground fissure around Yuhua Village is affected by the exploitation of underground confined aquifer and human construction activities. The above results can provide certain reference and theoretical support for urban land development and disaster prevention affected by land subsidence and ground fissures.