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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Sediment management and morphodynamics : The computational analysis of flow and sediment transport in lower reach of chikugo river, japan for...
The computational analysis of flow and sediment transport in lower reach of chikugo river, japan for a quantitative evaluation of wakatsu port training levee
Author : Y. KOGA (1), K. OHGUSHI (2) & T. JANSEN (3)
ABSTRACT
This study has a quantitative evaluation on the functions of Wakatsu Port training levee in the lower reach of Chikugo River, Japan. Numerical simulations of flow and sediment transport in this lower reach of Chikugo River are implemented. A 1D unsteady flow numerical simulation is executed to obtain the boundary conditions for a quasi-3D unsteady flow model which is used to simulate the detailed flow features around the training levee. The movement of sediment in the water is simulated by solving a 3D diffusion equation for the sediment. As a result of the 3D flow simulation, it becomes apparent that the existence of training levee causes to accelerate the flow of left bank side of the river against maximum flow velocity during the flood. From the results of sediment transport analysis, it found that the both cases of river beds show tendency of erosion regardless of the existence of the training levee by comparing the river bed variation distribution. Large river bed variations in the upstream and midstream can be seen, especially, in the left bank side for the case with the training levee. By comparing the river bed variations between the case with the training levee and the one without it, the transported sediment eroded in the upstream reach is considered to be transported downstream and have been deposited at the midstream reach where the flow velocity has decreased after the training levee¡¯s construction.
File Size : 1,041,519 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Sediment management and morphodynamics
Date Published : 28/08/2015
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