A Study on Multi-Baffle Dissipation Effective Analysis of Weir Downstream

Thursday 2 july 2015

12:42 - 12:45h at South America (level 0)

Themes: (T) Water engineering, (ST) Hydraulic machinery and industrial flows, Poster pitches

Parallel session: Poster pitches: 11C. Engineering - Industrial

Downstream scour and riverbed stability have been issues for weirs composed of movable weir or fixed weir due to multi-directional downstream flows. The existing one-directional flow interpretations are limited to apply to the understanding of multi-directional flows. Thus, subsequent occurrences due to multi-directional flows need to be investigated with the flows. This study investigates the effects of multi-baffles on flow dissipations. To achieve the goal, this study conducted the hydraulic experiments for locations and heights of multi-baffles downstream of a weir with a partial movable weir section. The hydraulic experiments were carried out in the experimental flume which is 2 m wide, 1.2 m high and 50 m long. The experiments were tested for the same conditions of the upstream discharge and downstream water level. The test section for multi-baffles was selected for an area of 2 m x 1 m for 190 locations. At each location in the multi-baffle area, the water depth and velocity were measured. For the tests for positioning of multi-baffles, 10 cases were carried out. The average depth of the case of multi-baffle installation increases for about 35% compared to the case without multi-baffles. The average velocity increase also decreases for about 30%. The maximum depth increase is observed as 39% and the maximum velocity decrease for 37%. From the tests for baffle heights, there was not a clear influence on the flow dissipation unlike the baffling positioning. For some cases, the multi-baffle height does not lead to the increase of flow velocity. There is a need of additional experiments for the influence of multi-baffle heights on downstream flows.

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