Application of GF-1 image to geological disaster survey in Cosibsumgy village on Sino-India border area
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摘要: 为了解高分一号卫星(GF-1)图像的应用性能和查明中印边境楚鲁松杰村一带的地质灾害发育规律,利用DEM和GF-1图像对该地区的岩性、构造和地质灾害进行详细的遥感解译。研究结果表明,GF-1数据的融合图像对灾害体的微地貌形态反映较明显,能够用于识别地质灾害体的位置、边界范围等特征信息;区内地质灾害类型主要为滑坡和寒冻风化碎屑流等,滑坡、崩塌、泥石流多发生在[25°,35°]坡度段内,而寒冻风化碎屑流的发生则与坡度的增大成正相关;地质灾害运移方向与主构造线方向、基岩层面倾向基本一致。研究还揭示出该区内分布多级河流阶地,较大的垂直落差及丰富的第四系松散堆积物是地质灾害发育的重要因素。
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关键词:
- 高分一号卫星(GF-1) /
- 中印边境 /
- 地质灾害 /
- 寒冻风化碎屑流 /
- 遥感调查
Abstract: Using data obtained from DEM and GF - 1 Satellite ( called GF - 1 ) concerning lithological characteristics in Cosibsumgy village on Sino -India border area, the authors conducted detailed remote sensing interpretation of structures and geological disasters to understand the application performances of GF-1 and find out the patterns of geological disasters that have happened in this area. The results show that the fused image of GF-1 data appears to be evident for the micro morphology of the disasters. It can identify the locations and outlines of the geological disasters. Landslide and frost weathering debris flow are dominant in the geological disasters. The landslide, collapse and mudslide mostly occur in the gradients ranging [25°, 35°], whereas the frost weathering debris flow has positive correlation with the gradients. The migration directions of the geological disasters are basically consistent with the directions of the main tectonic lines and the tendency of the bedrocks. Meanwhile, the multilevel river terraces existing in the area and the huge vertical fall from Quaternary system are the main causes for geological disasters, as revealed in this study. -
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