不同分辨率DEM的信息熵评价及其对径流模拟的影响

引用信息熵对不同分辨率DEM的信息量进行分析，对影响水文模拟的两个重要参数——径流路径和汇流平均坡度对DEM信息熵的敏感性进行评价，并在同一组模型参数下对DEM分辨率变化对径流模拟的影响进行分析，研究结果表明：径流总量、洪峰、水文响应时间对DEM分辨率的变化是非常敏感的。随着DEM分辨率的降低径流量减少，洪峰衰减，水文响应时间提前。

Information Entropy-based Assessment of Different Resolution DEM and Its Effects on Run-off Simulation

Flow length and slope of concentration are two key parameters used in distributed hydrological model method based on DEM for representing the hydrological processes together with other spatial information. In the present study, based on quantifying the DEM information included different DEM resolution using information entropy sensitivity index was used to investigate the sensitivity of flow length and slope of concentration extracted from various resolutions of DEMs. Two catchments located in the upstream of shiguan River were selected for the sensitivity analysis based on DEM data with mesh from 1km to 8km. It was found that when the DEM mesh size increases and flow length was shorten, the topography tends to be flat and the slope of concentration decreased. The sensitivity of flow length decreased and that of mean slope of concentration increased, estimates of runoff, peak flow and the hydrologic response all decreased consistently as the resolution grew more coarse.