摘要
利用GIS技术制作专题坡度图可知 ,锦屏一级水电站影响区内 16°～ 2 5°的坡度区占最大比例 ,河谷两侧主要坡度范围为 2 6°～ 3 5° ;由当地环境资源调查资料可知 ,影响区年降水量在 60 0mm以上 ,植被覆盖率平均为 3 0 93 % ,坡耕地占坡地面积平均为 2 97% ,当地土壤主要是山地草甸土 ,岩性多为硬性变质岩。根据有关评价标准 。
It is learnt from slope drawing of special topic made by using GIS technology that 16°～25° sloped area makes the maximum proportion in the effected area of Jinping Grade One Hydro Power Station. The slope on the both sides of the valley is mainly between 26° and 35°. It is known from the survey data of local environmental resources that the annual precipitation of the effected area is greater than 600 mm, the average rate of coverage of vegetation 30.93% and the average proportion of sloped farmland in sloped area 2.97%. The local red soil is mainly mountainous meadow soil and the lithologic character is mainly hard metamorphic rock. According to the related evaluation standard that the degrees of potential danger of soil erosion in the effected area of Jinping Grade One Hydro Power Station is decided as light danger type.
出处
《中国水土保持》
北大核心
2003年第11期32-34,共3页
Soil and Water Conservation in China
关键词
潜在水土流失
MAPGIS
锦屏一级水电站
potential soil and water loss
MAPGIS
Jinping Grade One Hydro-Power Station
