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OALib Journal期刊
ISSN: 2333-9721
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Quantitative monitoring of gully erosion in hilly-gully area of Loess Plateau based on aerial images
基于航片的黄土高原丘陵沟壑区沟谷侵蚀定量监测

Keywords: gully erosion,erosion rate,aerial photography,GIS,DOM,DEM
沟谷侵蚀
,侵蚀率,航片,地理信息系统,数字正射影像图,数字高程模型,航片,黄土高原丘陵沟壑区,沟谷侵蚀,定量监测,aerial,images,based,Loess,Plateau,area,gully,erosion,monitoring,空间差异,深度变化,面积,时间,中尺度,研究,手段,信息系统,地理,数字高程模型

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Abstract:

Based on the aerial photographs in 1979 and 1993, and by using geographical information system (GIS) techniques, the digital elevation models (DEM) and digital orthophoto map (DOM) were constructed from the geomorphic changes in a chosen gully in the Loess hilly-gully area, and the spatial difference of the changes and their key affecting factors were analyzed. The results indicated that from 1979 to 1993, the gully head advanced actively (with a length of 8.5 meters and an erosion rate of 481.28 t x hm(-2) x a(-1)), and the slope tended to become steeper, exhibiting a high erosion risk. The middle part of the gully had the largest newly eroded area and the highest erosion rate, and the erosion process was quite active, with the highest erosion risk. The water outlet was primarily endowed with deposition formation, whose eroded area was smaller than its deposition area, and the gully depth and slope were becoming less, with a lower erosion risk.

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