土木学会論文集B1(水工学)
Online ISSN : 2185-467X
水工学論文集第58巻
FRICTION SLOPE FORMULAE FOR THE TWO-DIMENSIONAL SHALLOW WATER MODEL
吉岡 秀和宇波 耕一藤原 正幸
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ジャーナル フリー

2014 年 70 巻 4 号 p. I_55-I_60

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Shallow water models, which assume the incompressibility of water and hydrostatic pressure distribution, serve as effective mathematical tools to describe dynamics of surface water flows. The 2-D shallow water equations (2-D SWEs) are among the most effective one. Solutions to the 2-D SWEs are sensitive to the choice of the friction slopes, the terms for turbulence and friction forces on side-walls. This paper carries out comparative numerical analysis on two Manning's friction slope formulae, a conventional water depth-based one and a hydraulic radius-based one, in order to see their influences on the solutions to the 2-D SWEs. Computational results of the hydraulic bores reveal relatively high accuracy of the hydraulic radius-based formula compared to the water depth-based counterpart.

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© 2014 Japan Society of Civil Engineers
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