CASC2D-SED模型的DEM尺度效应
发布时间:2018-01-29 05:33
本文关键词: 无人机 高分辨率DEM 水文过程模拟 CASCD-SED 尺度效应 出处:《地理与地理信息科学》2016年02期 论文类型:期刊论文
【摘要】:DEM分辨率深刻影响着以地形为基础的分布式水文过程模拟。以砒砂岩区二老虎沟小流域一个子沟为研究对象,通过无人机航测获得研究区DEM和影像,使用ArcGIS的栅格重采样方法和水文分析工具获得2~20m范围内11种分辨率的DEM、土地利用类型数据、土壤类型数据和河网数据,将相关数据输入CASC2D-SED模型,探讨不同的DEM分辨率在高分辨率区间对水文过程模拟的影响。研究表明:1)洪峰流量和模拟径流量均随DEM分辨率的降低呈波动上升;2)在2~3m和4~20m两个DEM分辨率区间水文过程线差别较大,而在4~20m范围内水文过程线变化不大;3)DEM分辨率对模型参数有重要影响,一定的DEM分辨率区间可以共用相同的水文参数,超过这个区间则必须重新率定;4)DEM分辨率增加使水文模拟效率降低。
[Abstract]:The DEM resolution deeply affects the distributed hydrological process simulation based on topography. Taking a sub-ditch in Erhugou small watershed in the soft rock area as the research object, the DEM and image of the research area are obtained by UAV aerial survey. Using the grid resampling method of ArcGIS and hydrological analysis tools, 11 kinds of resolution demm, land use type data, soil type data and river network data were obtained. Enter the relevant data into the CASC2D-SED model. The effects of different DEM resolutions on hydrological process simulation in high resolution range are discussed. The results show that both Hong Feng discharge and simulated runoff flow fluctuate with the decrease of DEM resolution. 2) the difference of hydrologic process line between two DEM resolution regions is great, but the variation of hydrologic process line is not obvious in the range of 4o 20m; 3Dem resolution has an important effect on the model parameters. A certain DEM resolution range can share the same hydrological parameters, beyond which the rate must be redetermined. The increase of Dem resolution reduces the efficiency of hydrological simulation.
【作者单位】: 河南大学黄河中下游数字地理技术教育部重点实验室;安徽理工大学测绘学院;黄河水利科学研究院水利部黄土高原水土流失过程与控制重点实验室;
【基金】:国家科技支撑计划项目(2013BAC05B01)
【分类号】:P208
【正文快照】: 水文过程的分布式建模可对连续的地形、不连续的土地利用以及土壤指标等要素进行离散描述,因此,分布式水文模型可促进水文过程与机理的深入研究。水文模拟中,河道和坡面数据通常由DEM提取,提取的数据精度很大程度上取决于DEM分辨率[1],因此,DEM的分辨率深刻影响着以地形为基础,
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