Regionalization of hydrologic parameters of Nash mode |
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Authors: | A R Ghumman M M Ahmad H N Hashmi M A Kamal |
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Institution: | 1.Civil Engineering Deparment,Al Qassim University,Buraidah,Saudi Arabia;2.COMSATS,Sahiwal Campus,Pakistan;3.Faculty of Civil and Environmental Engineering,University of Engineering and Technology,Taxila,Pakistan |
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Abstract: | hydrologic models are important tools to estimate runoff from a catchment. Identification of broad based parameters of a hydrologic
model for development of direct runoff hydrograph is a key issue for the modelers. Optimization and regionalization of hydrologic
parameters for application of Nash’s model is investigated in this paper. Six catchments dominated by hill torrent flows were
selected for this purpose. Fifty seven rainfall events were used for regionalization of parameters and about 55 events were
used for validation of the results. The hydrologic parameters of the Nash Model, number of linear cascades (N) and storage
coefficient (k) were determined using optimization based upon Downhill Simplex method. The data was collected by field measurements
and from Water and Power Development Authority (WAPDA) Pakistan. The physical parameters of the catchments were derived from
the satellite images of the watersheds with the help of ERDAS software. The performance of the model was assessed by the model
efficiency. It is concluded that the conceptual Nash model can simulate direct runoff hydrograph using regional hydrologic
parameters with model efficiency of 67%. |
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