Abstract
Abstract. The ancient Xi’an, China, has been suffering severe land subsidence and ground fissure hazards since the 1960s, which has affected the safety of Subways. Multi-sensor SAR data are conducted to monitor the latest complex ground deformation and its influence on subway line No.3 over Xi’an. Annual deformation rates have been retrieved to reveal the spatiotemporal evolution of ground subsidence in Xi’an city from 2013 to 2017. Meanwhile, the correlation between land subsidence and ground fissures are analyzed by retrieving the deformation differences in both sides of the fissures. Besides, the deformation along subway line No. 3 is analyzed, and the fast deformation section is quantitatively studied. Finally, a flat lying sill model with distributed contractions is implemented to model the InSAR deformation over YHZ subsidence center, which manifests that the ground deformation is mainly caused by groundwater withdrawal.
Highlights
The ancient Xi’an, located in the middle of Wei River Basin (Figure 1), is the capital of Shaanxi Province China
StaMPS Small baseline subsets (SBAS) can work on single-look images to identify single-look slow-varying filtered phase (SFP) pixels, whose phases decorrelate little over short time intervals (Hooper, 2008; Qu et al, 2014). γx, the representation of variations in the residual phase at the SFP candidate pixel, is defined as StaMPS
With the development of urban construction, the largest land subsidence occurs at YHZ, with the subsidence rate increasing from 135 mm/a in 2013 to 177 mm/a in 2016, and decreases to 114mm/a in 2017
Summary
The ancient Xi’an, located in the middle of Wei River Basin (Figure 1), is the capital of Shaanxi Province China. The urban Xi’an is bounded by the Chan River and Ba River to the east, the Jv River to the west, Wei River to the north and the Qinling Mountains to the south. Along with the economic development and urban extension, severe land subsidence and ground fissures have occurred in Xi’an since 1960s (Zhang et al, 2009; Zhao et al, 2008; Qu et al, 2014). The maximum cumulative land subsidence has reached approximately 3 m, and 14 ground fissures have emerged throughout the city in an east-north-east (ENE) direction, which have caused severe damages to the infrastructures, such as buildings, municipal pipelines, roads, bridges and metro railway
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