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

• DOI: 10.1016/j.wse.2022.04.002
• Publication Date: 2022-04-30T11:54:52Z
• Authors: Cheng Yao; Zhi-jia Li; Ke Zhang; Ying-chun Huang; Jing-feng Wang; Satish Bastola
• Keywords: Hydrological modelling; Raised-relief map

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