Abstract
Small baseline subsets interferometric synthetic aperture radar technique is analyzed to detect and monitor the loess landslide in the southern bank of the Jinghe River, Shaanxi province, China. Aiming to achieve the accurate preslide time-series deformation results over small spatial scale and abrupt temporal deformation loess landslide, digital elevation model error, coherence threshold for phase unwrapping, and quality of unwrapping interferograms must be carefully checked in advance. In this experience, land subsidence accompanying a landslide with the distance <1 km is obtained, which gives a sound precursor for small-scale loess landslide detection. Moreover, the longer and continuous land subsidence has been monitored while deformation starting point for the landslide is successfully inverted, which is key to monitoring the similar loess landslide. In addition, the accelerated landslide deformation from one to two months before the landslide can provide a critical clue to early warning of this kind of landslide.
Highlights
Loess in China occupies 0.63 million square kilometer and exists in 12 provinces, of which 0.4 million square kilometer is loess plateau
As the digital elevation model (DEM) applied in this research was generated 20 years ago, surface topography has been changed due to the previous landslides
Small-scale loess landslide is very common in the loess plateau of Northwest China, which can result in severe damage to local residents
Summary
Loess in China occupies 0.63 million square kilometer and exists in 12 provinces, of which 0.4 million square kilometer is loess plateau. The landslide in the southern bank of Jinghe River, Shaanxi province, China, is one of the typical cases, which is mainly triggered by farmland irrigation.[7,8,9] The southern bank of Jinghe River, a small section of the subregion of Weibei loess plateau in Weihe basin, is 27.1 km in length, including three towns as Taiping, Jiangliu, and Gaozhuang and 21 villages. The heights on this terrace range from 450 to 580 m, with the slopes.
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