Numerical Investigations of Flow in Vertical Single- and Double-slot Fishways.
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Accession number;03A0178547
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| Title;Numerical Investigations of Flow in Vertical Single- and Double-slot Fishways. |
| Author;
FUJIHARA M
(Ehime Univ., Ehime, Jpn)
FUKUSHIMA T
(Ehime Univ., Ehime, Jpn)
TACHIBANA K
(Ehime Univ., Ehime, Jpn)
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Journal Title;Transactions of the Japanese Society of Irrigation, Drainage and Reclamation Engineering
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Journal Code:S0345A
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ISSN:0387-2335
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VOL.;NO.223;PAGE.79-88(2003)
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| Figure&Table&Reference;FIG.20, TBL.1, REF.21 |
| Pub. Country;Japan |
| Language;English |
| Abstract;Most of the earlier studies on fishways have been focused on the flow structure by means of hydraulic models. Since the flow structure in a fishway is complicated with free surface and sub- and super-critical flow conditions usually coexist, only a few papers have been published which had applied numerical methods to the flow in fishways. The work presented in this paper consists of a grid generation based on quadtree grids, and a flow solver using Roe's approximate Riemann solver for convection terms of shallow water equations. The shallow water equations are discretized using finite volumes collocated with the grid cells, and integrated in time using a 4th order Runge-Kutta scheme. The flows in four types(three types for single-slot and one for double-slot) of vertical slot fishway are simulated. The numerical results show that the maximum velocity at the slot, which is almost equal to the theoretical value, and the velocity distribution in the pool do not change very much, even if the discharge would largely change. Moreover, it can be said that more calm region, where ascending fish could take a rest, is created in the single-slot fishway than double-slot type. (author abst.) |
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