DEM分辨率对分布式水文模拟的影响

摘要

Based on the digital elevation model ( DEM) , the Grid-Xin'anjiang model was employed to simulate flood events at different DEM resolutions to assess the effects of resolution on distributed hydrologic simulations. The results indicate that the simulated results may not be improved by using higher resolution DEM data while the accuracy of the watershed delineation can be enhanced. The Grid-Xin'anjiang model is able to produce comparable and promising results for different DEM resolutions with a recalibration of the routing parameters. For medium-sized watersheds, improved computational efficiency and simulation accuracy can be achieved by using the 30 arc-second DEM.%以数字高程模型为基础，采用栅格型新安江模型进行不同分辨率情况下的洪水模拟，分析了分辨率对分布式水文模拟的影响。研究结果表明：数字高程模型分辨率越高，流域数字化的精度相对越高，但模型的模拟结果并不一定越好；针对不同分辨率的数字高程模型，在重新率定汇流参数的情况下，栅格型新安江模型的模拟精度相当，均能取得较好的应用效果；对于中尺度流域而言，采用30义分辨率的数字高程模型不仅能够提高模型的运行时效，也能取得较高的模拟精度。