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Corresponding Author

Zidan, A. A.

Subject Area

Civil and Environmental Engineering

Article Type

Original Study

Abstract

In this research, a meandering reach from Damietta branch was selected and numerically studied. The aim of this study is to find the vulnerable zones subjected to maximum velocities so as to assign the appropriate methodology of training structures for improving and stabilizing flow conditions. This reach is approximately 6.78 km long, which located between km 95.22 and km 102 downstream of El- Roda gauge station. Field data were collected and analyzed for the modeling process. A 3-D model called IRIC (International River Interface Corporative) based on an explicit finite difference method (Abbott-Ionescu scheme) was applied. Therefore, in order to fulfill such objective, K-ɛ turbulence model was employed using upwind scheme of the advection terms. Through the modeling process, it was assumed that the sediment particles move in the bed layer zone only and the direction of sediment transport is the same as direction of flow. The effect of vegetation and interactions between sediment motion and vegetation were added in the modeling process. This model treats vegetation drag effects explicitly through drag terms in the equations of motion. From this study, it was found that the vorticity values through the upstream curve are greater than the corresponding ones in the downstream curve; consequently, the upstream curve is subjected to high water velocity values which may increase the scouring process.

Keywords

Numerical Modeling; turbulence model; Sediment; Vegetation; K-ε model

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