Comparison between GcIUH-Clark, GIUH-Nash, Clark-IUH, and Nash-IUH models

Authors : Arash ADIB, Meysam SALARIJAZI, Mohammad VAGHEFI

Pages : 91-104

Doi:10.3906/sag-1303-81

View : 25 | Download : 9

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :The estimation of flood hydrographs has a high level of importance in ungauged watersheds. Methods currently being widely used for the estimation of flood hydrographs utilize historical rainfall-runoff data. For ungauged watersheds, the unit hydrograph may be derived using the geomorphologic instantaneous unit hydrograph insert ignore into journalissuearticles values(GIUH); and geomorphoclimatic instantaneous unit hydrograph insert ignore into journalissuearticles values(GcIUH); approaches. This research is aimed at comparing the accuracy of GcIUH-based Clark insert ignore into journalissuearticles values(GcIUH-Clark); and GIUH-based Nash insert ignore into journalissuearticles values(GIUH-Nash); models. For this purpose, the Clark-IUH model option of the HEC-HMS package and the Nash-IUH model were employed with and without the use of historical rainfall-runoff data, respectively, to determine shape, peak discharge, and time to peak of direct surface run-off insert ignore into journalissuearticles values(DSRO); hydrographs. The case study in this study was the Kasilian watershed, located in Mazandaran Province of Iran, with an area of 67.5 km2. The results obtained from these models were compared with observed DSRO hydrographs based on 3 performance criteria, namely EFF, PEP, and PETP. The results clearly revealed the accuracy and applicability of these 2 models insert ignore into journalissuearticles values(the GcIUH-Clark model and the GIUH-Nash model); for derivation of DSRO hydrographs.
Keywords : GcIUH Clark model, GIUH Nash model, Kasilian watershed, instantaneous unit hydrograph