Horizontal Two Dimensional Turbulence Analysis Model for Open Channel Flows over Submerged Vegetation.
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Accession number;03A0178550
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| Title;Horizontal Two Dimensional Turbulence Analysis Model for Open Channel Flows over Submerged Vegetation. |
| Author;
NAKAYA TETSUO
(National Inst. Rural Engineering)
KINOSE KOICHI
(Ibaraki Univ., School of Agricuture, 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.107-116(2003)
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| Figure&Table&Reference;FIG.8, TBL.2, REF.16 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;A laboratory experiment was performed to clarify the fundamental structure of the open channel flow over submerged vegetation. As a result, it was clarified that the horizontal two dimensional turbulence analysis model can calculate mean velocity at vegetation and surface layer, and lateral mixing. The laboratory experiment shows that the vertical two dimensional flow occurred in both the vegetation layer and surface layer, and organized horizontal vortices were generated along the boundaries of the vegetation. A numerical computation employing SDS&2DH turbulence models was introduced to investigate the resistance and the roles the surface and vegetation layers, and the effect of generated turbulence. The results provided the basis for a new method which can apply not only to the flow with non submerged vegetation, but also to the flow over submerged vegetation and roughness. This model can predict the mean velocity of the surface and vegetation layers, and provide information on the shapes of vortices, lateral distributions of the depth averaged flow velocity and turbulence statistics. (author abst.) |
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