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A Study on Digital Hydrological Modeling

REN Li liang (College of Water Resources and Environment,Hohai Univ.,Nanjing 210098,China)  
A discussion is made on connotation and framework of the digital approach to catchment hydrological modeling.Meanwhile,a brief review is made on automated extraction of drainage network from grid digital elevation model (DEM).The Digital Elevation Drainage Network Model (DEDNM),developed by Martz and Garbrecht,is introduced,including model structure and computational procedure such as identification and treatment of depression or sink in DEM,raster based flow vector determination containing flat areas,sub watershed delineation,drainage network generation,numbering of network and subcatchment,and production of topological relation of river network structure.Then,the DEDNM is applied to the Shiguanhe River Basin of an area of 5930 km 2,the intensified observation field for the HUBEX/GAME.The result shows that the drainage system generated by the DEDNM is acceptable as compared with that on 1∶100?000 topography map.That provides a solid foundation for development of digital hydrological model.Digital rainfall runoff model can be established by use of the principle of Xin′anjiang Model over each subcatchment produced and numbered by the DEDNM.Finally,runoff is routed from each subcatchment to the catchment outlet by the digital network routing model on the basis of topological relation of river network structure produced by the DEDNM.The digital hydrological model works very well when used to simulate hourly and daily flood hydrograph in the Shiguanhe River Basin during the plum rainy period of 1998.
【Fund】: 国家教委霍英东教育基金;; 国家自然科学基金资助项目! ( 49794 0 3 0 )
【CateGory Index】: P334.92
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