發(fā)布時間：2018-01-29 05:33

  本文關鍵詞： 無人機 高分辨率DEM 水文過程模擬 CASCD-SED 尺度效應　出處：《地理與地理信息科學》2016年02期 　論文類型：期刊論文

【摘要】：DEM分辨率深刻影響著以地形為基礎的分布式水文過程模擬。以砒砂巖區(qū)二老虎溝小流域一個子溝為研究對象,通過無人機航測獲得研究區(qū)DEM和影像,使用ArcGIS的柵格重采樣方法和水文分析工具獲得2~20m范圍內(nèi)11種分辨率的DEM、土地利用類型數(shù)據(jù)、土壤類型數(shù)據(jù)和河網(wǎng)數(shù)據(jù),將相關數(shù)據(jù)輸入CASC2D-SED模型,探討不同的DEM分辨率在高分辨率區(qū)間對水文過程模擬的影響。研究表明:1)洪峰流量和模擬徑流量均隨DEM分辨率的降低呈波動上升;2)在2~3m和4~20m兩個DEM分辨率區(qū)間水文過程線差別較大,而在4~20m范圍內(nèi)水文過程線變化不大;3)DEM分辨率對模型參數(shù)有重要影響,一定的DEM分辨率區(qū)間可以共用相同的水文參數(shù),超過這個區(qū)間則必須重新率定;4)DEM分辨率增加使水文模擬效率降低。
[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.
【作者單位】： 河南大學黃河中下游數(shù)字地理技術教育部重點實驗室;安徽理工大學測繪學院;黃河水利科學研究院水利部黃土高原水土流失過程與控制重點實驗室;
【基金】：國家科技支撐計劃項目(2013BAC05B01)
【分類號】：P208
【正文快照】： 水文過程的分布式建�？蓪B續(xù)的地形、不連續(xù)的土地利用以及土壤指標等要素進行離散描述,因此,分布式水文模型可促進水文過程與機理的深入研究。水文模擬中,河道和坡面數(shù)據(jù)通常由DEM提取,提取的數(shù)據(jù)精度很大程度上取決于DEM分辨率[1],因此,DEM的分辨率深刻影響著以地形為基礎，

本文編號：1472670