基于分形维数的钱塘江流域地貌发育研究

Research on the Geomorphic Development in Qiantang River Basin Based on Fractal Dimension

基于钱塘江流域的数字高程模型,利用ArcGIS9.3的水文分析模块,提取了不同集水面积下的钱塘江流域河网信息。根据集水面积阈值与水系分维的相互关系,确定了该流域水系分维值为1.34-1.49;利用流域面积-高程积分曲线法对计算结果进行了验证,得出根据水系分维值划定流域地貌发育阶段这一规律并不适合此次研究,而应根据钱塘江流域面积-高程积分曲线对该流域的地貌发育阶段进行判断。因此,根据其积分曲线的特征确定了钱塘江流域处于地貌侵蚀发育阶段的老年期。

Based on the digital elevation model of the Qiantang river basin and using ArcGIS9.3 hydrological analysis module, the article extracts the of the river network information of Qiantang river basin under different catchment areas. According to relationship between the catchment area threshold and dimension of river network, the article determines the value of the dimension of this river networks is from 1.34 to 1.49. The article adopts the basin area--elevation integral curve method to verify the result,and comes to the conclusion that it is not suitable to judge the geomorphic development stage according to dimension of river network. The geomorphic development stage should be determined according to the area of Qiantang river basin elevation integral curve. Therefore,according to the features of the integral curve,the article determines that the geomorphological erosion development stage of Qiantang river basin belongs to the old age.