摘要
获取与真实状况吻合的河网是建立流域水文模型及进行水文研究的重要前提,而基于航天飞机雷达地形(SRTM)数字高程模型(DEM)栅格影像的水文分析所获得的河网可能与实际河网有一定程度的误差,在实际应用中,需要对原始DEM数据进行核查并校正.以甬江流域作为研究案例,采用该流域的2D标准河网矢量剖面分析排水路径的DEM高程值,并依据排水路径中河网的下游低于上游的原则,识别逆向坡度节点.应用编辑的Arcpy程序对河网逆向坡度节点重新计算,得到符合物理意义的3D河网矢量,并将其值反演至原始DEM栅格数据.实验表明,基于上述处理后的DEM数据所提取的河网趋近于实际河网.
Getting reasonable stream network in agreement with the real situation is the important premise of establishing watershed hydrological models and hydrological researches.However,the stream network derived from hydrological analysis based on a raster image of shuttle radar topography mission（ SRTM） digital elevation model（ DEM） always differs from the actual stream network. Therefore,a primary DEM raster image needs to be qualified and modified prior to be used.The Yong River basin was chosen as an example and 2D standard stream network vectors were used to profile the flow pathway on DEM,according to the rule that downstream must be below the upstream in the drainage path,an Arcpy program was used to modify the invert slope nodes＇ values in right order to arrive at a physically sensed 3D stream network. Finally,the 3D stream network values were re-embedded into the drainage pathway of the primary DEM. Subsequent tests prove that the modified DEM could provide quite reasonable stream network perfectly in agreement with the actual stream network.
出处
《大连海事大学学报》
CAS
CSCD
北大核心
2016年第4期55-60,共6页
Journal of Dalian Maritime University
