basin aspect
... 碱性岩 Basic rock 流域坡向 Basin aspect 流域指数 Basin index ...
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研究提取流域的基本地形特征如坡度和坡向，提取流域水系，划分了小流域。
The basic terrain characters of drainage area such as slope, aspect, and channel system, the demarcation of the small watershed was investigated.
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