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对于基于山坡单元的GBHM模型,河网阈值的选取决定了模型模拟时的流域离散精度。该文以流域地形地貌分析为基础,提出了一种基于多重分形的河网阈值联合优选SD-MF法,该法首先根据传统方法确定河网阈值的选取范围,然后利用多重分形选取阈值范围内的相对最优值。SD-MF法在密云水库以上潮河流域及白河流域的应用结果表明:2个流域恰当的河网阈值均为0.675 km2,为流域GBHM模型的构建奠定了基础。
For the GBHM model based on hillside units, the threshold selection of the river network determines the accuracy of basin dispersion when the model is simulated. Based on the analysis of landform and topography in the basin, a multi-fractal-based combined threshold selection method of river network threshold is proposed. Firstly, the selection threshold of river network threshold is determined according to the traditional method. Then the multi- The relative optimal value. The application results of SD-MF method in the above Chaohe and Baihe basins in Miyun Reservoir show that the appropriate thresholds of the two river basins are all 0.675 km2, which lays the foundation for the construction of the GBHM model in the basin.