Catchment area size of the depth lines (25 m grid data)

The complex relief parameter ‘intake area size’ describes the size of the catchment area of a grid cell in the depth line. The calculation was carried out using a ‘multiple flow-direction’ algorithm according to the Freeman (1991). The catchment area size of the depth lines was determined in order to obtain an indication for the separation of the valley forms with fluvial or colluvial (flood masses) filling. Depth lines with a catchment area greater than 40 ha are shown. Freeman, T.G. (1991): Calculating catchment area with divergent flow based on a regular grid. Computers and Geoscience, vol. 17, 3: 413-422.复杂地形参数"汇水区面积（intake area size）"用于描述深度线内单个网格单元的汇水区域规模。该参数的计算依据Freeman（1991）提出的"多流向算法（multiple flow-direction algorithm）"完成。本研究通过计算深度线的汇水区面积，旨在为区分以河流或坡积（洪积）物质充填的河谷形态类型提供判别依据。汇水区面积大于40公顷的深度线将被可视化展示。 Freeman, T.G. (1991): 基于规则网格的分流汇水区面积计算. 《计算机与地球科学》，第17卷第3期：413-422.