Monitoring and evaluation of gully erosion in China's largest loess tableland based on SBAS-InSAR

Gully erosion is widespread in central China's ecologically fragile loess plateau. However, research on the monitoring and evaluation of large-scale scarce. Here, we collected 16 pairs Sentinel-1A images from rainy season, spanning April 5-October 26, 2019, subsidence then quantified its results can indirectly reflect intensity largest plateau China, Dongzhiyuan tableland, using small baseline subset synthetic aperture radar interferometry (SBAS-InSAR). The showed that, average rate was 9 mm/year, throughout study area, Surprisingly, gully reached 160 sides correspond to most extensive intense erosion. Heavy rainfall, slope gradients below 15°, changes groundwater levels due freeze–thaw action water infiltration during lack vegetation continued side erosion, drive These demonstrate reliable ability SBAS-InSAR method accurately assessing InSAR-calculated demonstrates a strong predictive capability for soil generally consistent with previously observed although much noise interference also occurs. Therefore, future sedimentation could be used as an indirect measure at multiple watershed scales.