Abstract
Side-weirs have been widely used in hydraulic and environmental engineering applications. Side-weir is known as a lateral intake structure, which are significant parts of the distribution channel in irrigation, land drainage, and urban sewerage system, by flow diversion device. Local scour involves the removal of material around piers, abutments, side-weir, spurs, and embankments. Clearwater scour depth based on five dimensional parameters: approach flow velocity (V1/Vc), water head ratio (h1–p)/h1, side-weir length (L/r), side-weir crest height (b/p) and angle of bend θ. The aim of this study is to develop a new formulation for prediction of clear-water scour of side-weir intersection along curved channel using Gene Expression Programming (GEP) which is an algorithm based on genetic algorithms (GA) and genetic programming (GP). In addition, the explicit formulations of the developed GEP models are presented. Also equations are obtained using multiple linear regressions (MLR) and multiple nonlinear regressions (MNRL). The performance of GEP is found more influential than multiple linear regression equation for predicting the clearwater scour depth at side-weir intersection along curved channel. Multiple nonlinear regression equation was quite close to GEP, which serve much simpler model with explicit formulation.
Highlights
Side-weirs have been widely 2u3seRd iiina hsytrd.r,a5u1lic01a0ndTeanrvtuir,onEmsteonntaial engineering applications
The path of the thread of maximum velocity in an 180° curved channel deviates from its normal course towards the inner bank at an upstream section of the bend
Bagatur and Onen (2013) studied a predictive model on air entrainment by plunging water jets using Gene expression programming (GEP) and artificial neural network (ANN). The objective of this current study is to develop a new formulation technique for prediction of Clear-water scour of side-weir intersection along curved channel using GEP
Summary
Side-weirs have been widely 2u3seRd iiina hsytrd.r,a5u1lic01a0ndTeanrvtuir,onEmsteonntaial engineering applications. Gep prediction of scour around a side weir in curved channel greater inertia than water near the bottom, which has a velocity less than the average. This greater inertia directs the higher-velocity water toward the outer channel bank, while the slower water moves inward because of the lateral pressure gradient set up by the outward-moving water at the surface. This causes a spiral flow that may persist for some distance downstream. It again returns toward its normal course (Agaccioglu et al 2007)
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