Scientia Iranica

Scientia Iranica

Development of group method of data handling based on genetic algorithm to predict incipient motion in rigid rectangular storm water channel

Document Type : Research Article

Authors
I. Ebtehaj 1
H. Bonakdari 2
F. Khoshbin 2
Ch. Hin Joo Bong 3
A. Ab Ghani 4
1 Department of Civil Engineering, Razi University, Kermanshah, Iran.
2 Department of Civil Engineering, Razi University, Kermanshah, Iran
3 Department of Civil Engineering, Faculty of Engineering, University Malaysia Sarawak, Malaysia
4 River Engineering and Urban Drainage Research Centre (REDAC), University Sains Malaysia
10.24200/sci.2017.4083
Abstract
Sediment transport is a revalent vital process in fluvial and coastal environments, and \incipient motion" is an issue inseparably bound to this topic. This study utilizes a novel hybrid method based on Group Method of Data Handling (GMDH) and Genetic Algorithm (GA) to design GMDH structural (GMDH-GA). Also, Singular
Value Decomposition (SVD) was utilized to compute the linear coecient vectors. In order to predict the densimetric Froude number (Fr), the ratio of median diameter of particle size to hydraulic radius (d=R) and the ratio of sediment deposit thickness to hydraulic radius (ts=R) are utilized as e ective parameters. Using three diff erent sources of experimental data and GMDH-GA model, a new equation is proposed to predict incipient motion. The performance of development equation is compared using GMDH-GA and traditional equations . The results indicate that the presented equation is more accurate (RMSE = 0:18 and MAPE = 6:48%) than traditional methods. Also, a sensitivity analysis is presented to study the performance of each input combination in predicting incipient motion.
Keywords
genetic algorithm (GA)
Group Method of Data Handling (GMDH)
Rigid rectangular channel
Incipient motion
Sediment transport
Storm water
Subjects
Scientia Iranica
Volume 24, Issue 3
Transactions on Civil Engineering (A)
May and June 2017
Pages 1000-1009

  • Receive Date 14 November 2015
  • Revise Date 02 February 2016
  • Accept Date 23 February 2016