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Evaluating performance dependency of a geomorphologic instantaneous unit hydrograph-based hydrological model on DEM resolution

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Water Science and Engineering 2022年第3期15卷 179-188页

作者： Cheng Yao Zhi-jia Li Ke Zhang Ying-chun Huang Jing-feng Wang Satish Bastola College of Hydrology and Water Resources Hohai UniversityNanjing 210098China Yangtze Institute for Conservation and Development Hohai UniversityNanjing 210098China State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Hohai UniversityNanjing 210098China China Meteorological Administration-Hohai University Joint Laboratory for Hydrometeorological Studies Hohai UniversityNanjing 210098China School of Civil and Environmental Engineering Georgia Institute of TechnologyAtlanta 30332USA Department of Civil and Environmental Engineering University of New OrleansNew Orleans 70148USA

The digital elevation model(DEM)is a type of model that has been widely used in terrain analysis and hydrological *** resolution influences the hydrological and geomorphologic features of delineated catchments and consequently affects hydrological *** study investigated the impacts of DEM resolution on the performance of the xaj-giuh hydrological model,a model coupling the widely used Xinanjiang(xaj)hydrological model with the geomorphologic instantaneous unit hydrograph(giuh),in flood simulations in small and medium-sized *** test the model performance,the model parameters were calibrated at a fine DEM resolution(30 m)and then directly transferred to the simulation runs using coarser ***,model recalibration was conducted at coarser DEM *** the simulation runs with the model parameters calibrated at the 30-m resolution,the DEM resolution slightly affected the overall shape of the simulated flood hydrographs but presented a greater impact on the simulated peak discharges in the two study *** xaj-giuh model consistently underestimated the peak discharges when the DEM resolution became *** qualified ratio of peak simulations decreased by 35%when the DEM resolution changed from 30 m to 600 ***,model recalibration produced comparable model per-formances when DEMs with different resolutions were *** study showed that the impact of DEM resolution on model performance can be mitigated by model recalibration to some extent,if the DEM resolution is not too coarse.

关键词： DEM resolution xaj-giuh model Flood simulation model recalibration Small and medium-sized catchments

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