Use of gene-expression programming to estimate manning’s roughness coefficient for a low flow stream

Chaplot, Barkha and Peters, Makama and Birbal, Prashant and Pu, Jaan H. and El-Shafie, Ahmed (2021) Use of gene-expression programming to estimate manning’s roughness coefficient for a low flow stream. Larhyss Journal, 2021 (48). pp. 135-150. ISSN 2521-9782,

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Manning’s roughness coefficient (n) has been widely used to estimate flood discharges and flow depths in natural channels. Therefore, although extensive guidelines are available, the selection of the appropriate n value is of great importance to hydraulic engineers and hydrologists. Generally, the largest source of error in post-flood estimates is caused by the estimation of n values, particularly when there has been minimal field verification of flow resistance. This emphasizes the need to improve methods for evaluating the roughness coefficients. Trinidad and Tobago currently does not have any set method or standardised procedure that they use to determine the n value. Therefore, the objective of this study was to develop a soft computing model in the calculation of the roughness coefficient values using low flow discharge measurements for a stream. This study presents Gene-Expression Programming (GEP), as an improved approach to compute Manning’s Roughness Coefficient. The GEP model was found to be accurate, producing a coefficient of determination (R2) of 0.94 and Root Mean Square Error (RSME) of 0.0024. © 2021.

Item Type: Article
Uncontrolled Keywords: Gene-expression programming;Manning’s roughness coefficient; Open-channel flow
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Faculty of Engineering
Depositing User: Ms Zaharah Ramly
Date Deposited: 01 Nov 2022 03:47
Last Modified: 01 Nov 2022 03:47

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