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Journal of Environmental Hydrology
ISSN 1058-3912 |
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Electronic Journal of the International Association for
Environmental Hydrology
JEH Volume 18 (2010), Paper 15 Posted August 31, 2010 EVALUATION OF GEOMORPHOLOGIC INSTANTANEOUS UNIT HYDROGRAPH METHOD IN FLOOD HYDROGRAPH SIMULATION
M.R. Khaleghi1 2 Faculty of Natural Resource, University of Tehran, Tehran, Iran ABSTRACT A watershed is considered as a system consisting of different interrelated hydrologic units that react to rainfall. The present research was carried out to investigate the consistency, accuracy and reliability of a geomorphologic model in comparison with Snyder, SCS, Triangle, Rosso and geomorphoclimatic unit hydrographs in determination of the shape and dimensions of the outlet runoff hydrograph in the Kasilian basin located in the Mazandaran Province of Iran. For this purpose, the first twenty one equivalent rainfall-runoff events were selected and for each, a hydrograph of outlet runoff was calculated. Then the models were compared with the observed hydrograph, for peak time and peak flow of outlet runoff. The most efficient model for estimation of the hydrograph of outlet flow for similar regions was proposed. Comparison of calculated and observed hydrographs showed that the geomorphologic model had the most direct agreement in two parameters of peak time and peak flow of direct runoff. Also, the geomorphological model had the least amounts of main relative and square error. The result also showed that the efficiency of geomorphologic model ratio for Snyder, SCS, Triangle, Rosso and geomorphoclimatic hydrographs in the study basin are 91.06, 99.11, 88.642, 48.195 and 4.944, respectively. Comparing with other models, the geomorphologic and geomorphoclimatic hydrographs are the most efficient methods to estimate flood discharge. Reference: Khaleghi, M.R., J. Ghodusi, and H. Ahmadi. 2010. Evaluation of geomorphologic instantaneous unit hydrograph method in flood hydrograph simulation. Journal of Environmental Hydrology, Vol. 18, Paper 15. CONTACT: Mohammad Reza Khaleghi Department of Watershed Management Science and Research Branch Islamic Azad University P.O. Box 95719/9 Tehran, Iran E-mail: drmrkhaleghi@gmail.com |
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