Numerical Simulation of Transverse Dikes and Point Bars effect on Flow Pattern in Natural Meandering of the Tajan River

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KHOSRAVI GH.R.; BAHREMAND A.; TEIMOURI M.; Ahmadyousefi S.

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Journal: Journal of Water and Soil Conservation Year:2021 | Volume:28 | Issue:2 Page(s): 159-175

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Title

Numerical Simulation of Transverse Dikes and Point Bars effect on Flow Pattern in Natural Meandering of the Tajan River

Author(s)

KHOSRAVI GH.R. | BAHREMAND A. | TEIMOURI M. | Ahmadyousefi S. | Issue Writer Certificate

Keywords

CCHE2D

Meandering

Point Bars

Tajan River

Transverse Dike (Epi)

Abstract

Background and Objectives: The transverse dikes (epi) has many applications for river bank erodibility stabilization and consolidation. Water flow pattern, erosion and sedimentation around the transverse dike depend on various factors, such as transverse dike type, geometry sections, sediment transport capacity and etc. In this research, a two-dimensional numerical model called CCHE2D was used for numerical simulation of transverse dikes and Point Bars’ effect on flow pattern in a reach of Tajan River (located in the North of Sarakhs and downstream of Noruzababd village-Razavi Khorasan Province of Iran). Materials and Methods: In the first step of this study, a detailed topographic map was prepared with scale of 1: 2000. Then in three surveyed sections, the flow parameters were measured while the greatest emphasis was on the area around the transverse dikes and river islands (Point Bars). Using topographic data obtained from field surveys and then the geometry model and the computational mesh (grid) with different dimensions and also field measurements of flow characteristics such as velocity and depth, the two-dimensional hydrodynamic model was run. The simulated values were compared with the observed ones in order to assess the velocity horizontal profile gradients, the distribution of shear stress and the flow depth condition in curved parts of the river channel and around the transverse dikes and river islands. Furthermore, two statistical criteria (RMSE and MAPE) were used to evaluate the performance of the model. Results: The results of this study indicate the appropriate accuracy of the model in predicting flow parameters in around the transverse dikes and river islands. This model also accurately displays the positions of maximum flow shear stress in the river bed and banks. The simulation results of this study also showed that the rotational vectors of the upstream water flow of the transverse dikes are larger than the downstream ones. On the other hand, the amount of velocity and shear stress in the downstream area of the transverse dikes is higher than their upstream and the flow velocity decreases by moving downstream of the transverse dikes. Conclusion: The results of this study show that for the observed discharge of 47 m 3 /s and discharges with a return period of less than 25 years, the transverse dikes have local effects on the deviation of the flow, and they cannot lead to the diversion of floods with a return period of less than 25 years to the eastern banks. Because the high density of vegetation and high roughness of the east coast prevents the distribution of flow to the natural channels.

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APA: Copy

KHOSRAVI, GH.R., BAHREMAND, A., TEIMOURI, M., & Ahmadyousefi, S.. (2021). Numerical Simulation of Transverse Dikes and Point Bars effect on Flow Pattern in Natural Meandering of the Tajan River. JOURNAL OF WATER AND SOIL CONSERVATION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES), 28(2 ), 159-175. SID. https://sid.ir/paper/959654/en

Vancouver: Copy

KHOSRAVI GH.R., BAHREMAND A., TEIMOURI M., Ahmadyousefi S.. Numerical Simulation of Transverse Dikes and Point Bars effect on Flow Pattern in Natural Meandering of the Tajan River. JOURNAL OF WATER AND SOIL CONSERVATION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES)[Internet]. 2021;28(2 ):159-175. Available from: https://sid.ir/paper/959654/en

IEEE: Copy

GH.R. KHOSRAVI, A. BAHREMAND, M. TEIMOURI, and S. Ahmadyousefi, “Numerical Simulation of Transverse Dikes and Point Bars effect on Flow Pattern in Natural Meandering of the Tajan River,” JOURNAL OF WATER AND SOIL CONSERVATION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES), vol. 28, no. 2 , pp. 159–175, 2021, [Online]. Available: https://sid.ir/paper/959654/en

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