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Reduction of local scour at river confluences using a collar

International Journal of Sediment Research 2017年第3期32卷 364-372页

作者： Nargess Amini behnam balouchi Mahmood Shafai Bejestan Department of Civil Geological and Mining Engineering Ecole polytechnique de Montréal Department of Hydraulic Structure School of Water Engineering Shahid Chaman University of Ahvaz Department of Water and Environmental Engineering School of Civil Engineering Shiraz University

River confluences(RCs) are important features within river systems where the three dimensional(3 D)flow structures and the downstream mixing of flows can cause deep scour holes. Despite this, few methods have been proposed to control scouring at RCs. In this study, application of a collar was experimentally examined for local scour control at the point where two rivers flow together. In particular, experimental tests were done with and without collar application at three different locations. The results reveal that the scour depth is directly proportional to the discharge ratio, i.e. the ratio of lateral discharge to that in the channel downstream of the confluence, and the densimetric Froude number(Frg).In addition, installation of a collar at RCs can decrease the scour depth up to 100%, thus completely avoiding the scour process. The results also show that by increasing the Frg the optimal installation location for a collar changes and moves towards the river bed level. Using a collar can also reduce the height of the point bar formed downstream of the confluence. The outcomes of the study allow derivation of an equation for predicting scour depth when a collar is applied as a countermeasure. The analysis of this equation shows that the estimates are mostly affected by the Frg.

关键词： Scour River confluence Discharge ratio Densimetric Froude number Collar

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