| Using four years of Landsat series remote sensing image data of water body in Huainan mining area, the dynamic change of subsidence seeper areas were studied. Based on the spectral characteristics of water body, using normalized difference vegetation index (NDVI), normalized difference water index (NDWI) and tasseled cap transformation indexes, constructing decision tree classification rule and GIS comparison method, the dynamic change of the water body was obtained. The results showed that during 1987—2015, the seeper subsidence area was 189.51 km2, with an average annual increase of 6.77 km2. Especially in 2000—2005, the average annual increase was 15.0 km2. The dynamic change degree of the water body and the spatial dynamic change degree were up to 13.66% and 53.61%, respectively. The average annual increase of the seeper subsidence area was 2.60 km2 in Fengtai mining area, followed by Xinji, Panji and Kongli subsidence area. The water body was increased in Panji and Fengtai mining areas, remained stable in Dingji and Zhuji mining areas, and reduced in other mining areas by the “subsidence management strategy”. |
