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中文摘要：
集水面积阈值的确定是基于数字高程模型提取水系过程中的关键环节，但目前集水面积阈值的确定存在着随意性和主观性。本文引入分维数量化集水面积阈值对水系提取的影响。研究表明，在给定标度区间内集水面积闽值和分维数存在着良好的回归关系。二者的拟合方程可用来进行集水面积阈值的合理确定和水系的准确提取。
英文摘要：
The determination of catchment area threshold is of great importance in the algorithm for delineation of a drainage network. Based on different catchment area threshold, drainage network is extracted at different river system structure and different fractal dimensions. The goal of this paper is to find in what extend the threshold may influence the fractal dimension of the drainage. And through the grid fractal method, a fitted equation was proposed from the value of thresholds and fractal dimensions. There were strong relativities about the change between them. By the equation, the catchment area threshold could be determined from the fractal dimension of the natural drainage.
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