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Water Resour Manage (2010) 24:29712989 DOI 10.1007/s11269-010-9590-3
 

Summary: Water Resour Manage (2010) 24:29712989
DOI 10.1007/s11269-010-9590-3
Estimation of a Unique Pair of Nash Model
Parameters: An Optimization Approach
Muhammad Masood Ahmad Abdul Razzaq Ghumman
Sajjad Ahmad Hashim Nisar Hashmi
Received: 4 September 2009 / Accepted: 11 January 2010 /
Published online: 21 January 2010
Springer Science+Business Media B.V. 2010
Abstract Water resources planning and management requires hydrologic models
to estimate runoff from a catchment. For catchments with limited data, the choice
of model and identification of its parameters is very important for development of
a direct runoff hydrograph. A method is presented to determine a unique pair of
hydrologic parameters of the Nash Model, number of linear cascade (n) and storage
coefficient (k), using optimization based on Downhill Simplex technique. In this
study physical parameters of the catchment are derived from (SPOT) satellite
imageries of the basin using ERDAS software. Four different objective functions of
varying complexity are tested to find the best solution. Weighted root mean square
error (RMSE) and Model Efficiency (Nash-Sutcliffe coefficient) are used to evaluate
the model performance. Using the NASH model, a direct surface runoff hydrograph

  

Source: Ahmad, Sajjad - Department of Civil and Environmental Engineering, University of Nevada at Las Vegas

 

Collections: Engineering