【摘要】 以涪江流域为例,基于1∶5万和1∶25万两种比例尺数字高程模型(DEM),利用Arc Hydro Tools对DEM预处理后进行流域提取,分析通过不同方案提取的河网、流域面积等相关参数,同时针对不同分辨率河网出现差异地段的地形坡度和地形标准差进行分析.实验结果表明:提取结果的精度在总体上是符合要求的,但是在地势平坦区域人类活动干扰较大的地区,提取的结果与实际相差较大.从提取的效率和实验结果的精度两方面来看,基于Arc Hydro Tools的流域特征自动提取是切实可行的.更多还原

【Abstract】 Fujiang river basin has been selected as the study area,and drainage basin characteristics been exacted and analyzed from "burn-in"DEM at two scales(1:50000and 1:250000)with the Arc Hydro Tools,The selected parameters include those commonly use in hydrology and geomorphology such as drainage network,area and channel length.According to the different resolution of differences between the sections of the river terrain slope and standard deviation of terrain have been compared and analyzed.Two results show that 1)for different resolutions,the derived drainage network have some different on flat area or the disturbance of human activities area,but the accuracy is meet the requirement;2)from the efficiency and the accuracy,drainage basin characteristics exacted by using the Arc Hydro Tools is feasible.更多还原