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中文摘要：
本文以ASTER GDEM为基本数据源，基于均值变点方法，选取合适的汇流闯值，得到川中丘陵区嘉陵江支流西河流域水系；在此基础上对其沟谷段特征进行了研究。结果表明，均值变点方法能较好判定提取川中丘陵区西河水系的汇流闽值；ASTER—GDEM总体上能较好描述丘陵地区沟谷水系；西河水系源头区沟谷段偏长，侵蚀较为强烈。
英文摘要：
Based on mean change point method（MCP）, a reasonable flow accumulation threshold was picked out to extract the water system of Xihe River in hilly area of Central Sichuan, which is a branch of Jialing River systems. Research showed that MCP method could be effective in determination of flow accu- mulation threshold, and ASTER-GDEM could depict the water system well in the channel section of hilly area. Moreover, it was got that from the viewpoint of geomorphological evaluation, Xihe river is in the development of infancy with distinct V shape valley.
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