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中文摘要：
沟谷水系提取及分析,在描述地形骨架、获取构建分布式水文模型参数及研究地貌发展进程中有重要作用。传统的水系分维计算方法主要有量规法和栅格法,本文将汇流阈值类比量规,遵照量规法的计算方法,研究流域的不同汇流,值得到不同的水系长度,分析其对数关系以计算水系的分维值。基于ASTER-GDEM数据源,以陕西省延河流域为例进行分析,其分维值为1.058;结合流域侵蚀积分曲线可知,延河流域水系侵蚀强烈。
英文摘要：
Gully extraction and analysis is very important in depicting terrain skeletons,which can obtain parameters of distributed hydrological model and gain information for geomorphological evolution research.There are the Gauge method and Grid method to calculate the fractal dimension of hydrological network in traditional ways.In this paper,the flow accumulation was used as the ruler to measure the length of gullies.When different flow accumulation was chosen,different river network can be obtained correspondingly.On the basis of regression analysis to a linear function between log（flow accumulation） and log（river length）,the value of fractal dimension was achieved.Based on ASTER-GDEM,the fractal dimension of Yanhe River is 1.058.Combined with erosion integration curve,it showed that Yanhe River is of strong erosion.
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