基于HYDRO1K、SRTM3和ASTER GDEM的韩江流域水文地形信息对比

发布时间：2018-03-13 07:14

本文选题：数字高程模型　切入点：水文地形信息　出处：《中国农村水利水电》2017年02期 　论文类型：期刊论文

【摘要】：基于HYDRO1K、SRTM3和ASTER GDEM 3种DEM数据,对BTOPMC地形子模型提取的韩江流域地形信息进行了对比分析。结果表明:SRTM3最能精微地反映流域地形特征和土壤水分空间分布格局,ASTER GDEM次之,低分辨率的HYDRO1K则过度坦化了流域地形,使得基于地形指数的流域土壤水分分布趋于均匀,在产流表现上易于饱和,从水文意义上达不到刻画像韩江这一尺度流域的山地、丘陵地形。当水平分辨率达到一定精度时,与水平分辨率相比,DEM的垂直精度对提取地形信息的真实性起控制作用。ASTER GDEM的水平分辨率虽最高,但垂直精度不如SRTM3,所以提取的地形信息不如SRTM3精确。地形信息提取精度与DEM的填洼算法和流向算法有关。BTOPMC采用随区域地貌倾斜度而变化的小高程增量逐步填洼,填洼过程对区域地形信息的扰动较小。在采用D8单流向算法确定栅格水流方向时,沿最陡坡度流向比沿最大落差流向更容易产生水平和垂直流向。但由于HYDRO1K DEM生成时融合了DCW河网信息,2种流向算法对地形指数的影响只限于那些不具有河网信息的源头区域。
[Abstract]:Based on HYDRO1K, SRTM3 and ASTER GDEM 3 DEM data, the extraction of Hanjiang River Basin BTOPMC terrain model of terrain information were analyzed. The results show that SRTM3 can reflect the subtle topographic features and spatial distribution of soil moisture pattern in ASTER, GDEM, low resolution HYDRO1K over flat terrain. The watershed topographic index, soil moisture distribution tends to be uniform in performance based on runoff easily saturated, the hydrological significance could not reach the carvings Hanjiang River basin scale mountain, hilly terrain. When the horizontal resolution reaches a certain accuracy when compared with the horizontal resolution, the accuracy of the vertical DEM horizontal resolution of terrain extraction the information control.ASTER of GDEM was the highest, but the vertical accuracy than SRTM3, so the terrain information extraction is better than SRTM3 and DEM. The accurate extraction accuracy of terrain information is filled in wa Method and algorithm of the.BTOPMC flow with small height increment with the inclination of the regional landform change gradually filling, less disturbance filling process of regional terrain information. Using D8 in single flow direction algorithm to determine the grid flow direction, along the steep slope to the more prone to horizontal and vertical flow along the flow direction. But the maximum drop ratio because the HYDRO1K DEM generated when the integration of DCW network information, the effect of 2 kinds of algorithms on the topographic index is limited to those who do not have the source of information network.

【作者单位】：华南农业大学水利与土木工程学院;
【基金】：国家自然科学基金项目(41171029) 广东省水利科技创新项目(2009-42)
【分类号】：P333

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