Please use this identifier to cite or link to this item: https://hdl.handle.net/11147/2864
Title: GA-optimized model predicts dispersion coefficient in natural channels
Authors: Tayfur, Gökmen
Tayfur, Gökmen
Izmir Institute of Technology. Civil Engineering
Keywords: Mathematical model
Cross-over
Dispersion coefficient
Gene pool
Genetic algorithms
Mutation
Issue Date: 2009
Publisher: IWA Publishing
Source: Tayfur, G. (2009). GA-optimized model predicts dispersion coefficient in natural channels. Hydrology Research, 40(1), 65-75. doi:10.2166/nh.2009.010
Abstract: Models whose parameters were optimized by genetic algorithm (GA) were developed to predict the longitudinal dispersion coefficient in natural channels. Following the existing equations in the literature, ten different linear and nonlinear models were first constructed. The models relate the dispersion coefficient to flow and channel characteristics. The GA model was then employed to find the optimal values of the constructed model parameters by minimizing the mean absolute error function (objective function). The GA model utilized an 80% cross-over rate and 4% mutation rate. It started each computation with a population of 100 chromosomes in the gene pool. For each model, while minimizing the objective function, the values of the model parameters were constrained between [-10, +10] at each iteration. The optimal values of the model parameters were obtained using a calibration set of 54 out of 80 sets of measured data. The minimum error was obtained for the case where the model was a linear equation relating dispersion coefficient to flow discharge. The model performance was then satisfactorily tested against the remaining 26 measured validation datasets. It performed better than the existing equations. it yielded minimum errors of MAE = 21.4m2/s (mean absolute error) and RMSE = 28.5m2/s (root mean-squares error) and a maximum accuracy rate of 81%. © IWA Publishing 2009.
URI: http://doi.org/10.2166/nh.2009.010
http://hdl.handle.net/11147/2864
ISSN: 0029-1277
0029-1277
Appears in Collections:Civil Engineering / İnşaat Mühendisliği
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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