Download e-book for iPad: Flow and sediment transport in compound channels: the by S. Ikeda, I.K. McEwan

By S. Ikeda, I.K. McEwan

This monograph offers a finished state of the art description of the paintings conducted within the united kingdom and Japan on "Flow and Sediment delivery in Compound Channels". It hence describes learn which has been carried out, essentially during the last twenty years, and which has yielded a pretty distinctive photograph of the $64000 behaviours of compound channels and produced a couple of engineering prediction methods Read more...

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Additional resources for Flow and sediment transport in compound channels: the experiences of Japanese and UK research

Sample text

However, the position of the maximum velocity point moves below the free surface with an increase in the flow depth, because the influence of the secondary flows increase with increasing flow depth, H. In the case of H15 November 27, 2004 1:18 RPS 38 iahr D. W. Knight et al. Fig. 5). November 27, 2004 1:18 RPS iahr Flow Structure Fig. 28 Isovel Lines for Group H (see Fig. 5). 39 November 27, 2004 1:18 RPS 40 iahr D. W. Knight et al. 0), the maximum velocity points are located well below the free surface in both the main-channel and floodplain.

The maximum velocity filament in the main channel is seen to be depressed below the nominal ‘free surface’ by the strong secondary flow at the re-entrant corners, which tends to bring low momentum fluid up to the surface, thereby reducing the discharge considerably in the upper layers of the main channel. The values of Ud and τb on the floodplain and main channel are roughly similar, indicating little net lateral momentum transfer between these regions. 05. In this case there is not only a strong lateral shear layer present, but now the longitudinal vortices are manifest in the distortion of the isovels in the lower main channel, due to the low aspect ratio.

5). 39 November 27, 2004 1:18 RPS 40 iahr D. W. Knight et al. 0), the maximum velocity points are located well below the free surface in both the main-channel and floodplain. This phenomenon may also be caused by the secondary flows, because low momentum flow is transported from the main channel sidewall and the floodplain bed to the free water surface by the secondary currents. uk. 30 show the effect of duct depth and streamwise vorticity on the isovels of the streamwise component of velocity, U, the depth-averaged velocity, Ud , (symbol ∆) and the boundary shear stress, τb (symbol x).

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