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选择湟水河流域为研究区,以2000年与2009年的Landsat TM/ETM数据为信息源提取土地覆盖以及植被覆盖度信息,结合Aster DEM数据,在地理信息系统技术的空间分析功能的支持下,依据水利行业《土壤侵蚀分类分级标准》(SL190—2007),通过叠加分析研究区近10a生态环境建设工程的水土保持效应。结果表明,10a中湟水河流域坡面侵蚀有所减弱,2009年微度以上侵蚀相比2000年少了309.11km2,但沟谷侵蚀强度趋于增强,10a净增加706.87km2。研究表明目前工程措施对于治理面蚀效果明显,对于沟蚀作用不明显。
In order to extract the information of land cover and vegetation coverage based on Landsat TM / ETM data of 2000 and 2009, and to combine Aster DEM data with the support of spatial analysis of GIS technology, According to the classification standard of soil erosion (SL190-2007) of the water conservancy industry, the effect of soil and water conservation of nearly 10a ecological environment construction projects in the study area was studied through overlay analysis. The results showed that the slope erosion in the Zhongliuhe River basin tended to be weakened in 2009, and the erosion rate in 2009 was 309.11 km2 less than that in 2000, but the erosion intensity in the valley tended to increase, with a net increase of 706.87 km2. Research shows that the current engineering measures for the treatment of surface erosion effect is obvious, the role of gutter is not obvious.