Investigation of the flow structure within a vegetation patch in a rubble-bed river

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Jahadi Mahsa; AFZALIMEHR HOSSEIN

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Journal Paper

Paper Information

Journal: JOURNAL OF HYDRAULICS Year:2019 | Volume:14 | Issue:2 (142) Page(s): 69-88

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Information Journal Paper

Title

Investigation of the flow structure within a vegetation patch in a rubble-bed river

Author(s)

Jahadi Mahsa | AFZALIMEHR HOSSEIN | Issue Writer Certificate

Keywords

Vegetation patchQ1

Beheshtabad RiverQ1

Mixing layerQ1

Quadrant analysisQ1

Reynolds stressQ1

Abstract

The impact of submerged Vegetation patch on the hydraulic parameters such as flow resistance and sediment transfer is significant. However, a few researches in this field have been reported. Flow within and just above the Vegetation patch behaves similarly to the Mixing layer rather than the boundary layer, thus at this research, the Mixing layer theory to quantify the interaction between flow and submerged Vegetation patch was evaluated. Although, the effects of the not fully-developed flow over small patches has not been considered in the canonical Mixing layer theory. Accordingly, it is essential to combine a canonical Mixing layer model and modified equations to quantify evolving area along the patch. This study used the field experiments to evaluate the applicability of this theory. Field experiments were conducted over Vegetation patches with three different densities in Beheshtabad River with rubble bed in Chaharmahal-Bakhtiari province. The results reveal that there is a reasonable agreement between the measured values of velocity and Reynolds stress profile with the estimated ones by evolving Mixing layer equations. However, the spreading coefficient of this model is reduced by increasing the canopy density thanks to the limitation in the vertical development of eddies. Quadrant analysis over Vegetation patch shows the dominate event under the crest of canopy is “ ejection” and over the crest of canopy is “ sweep” . Moreover, the contribution of “ sweep” event increases slightly at downstream of Vegetation patch.

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APA: Copy

Jahadi, Mahsa, & AFZALIMEHR, HOSSEIN. (2019). Investigation of the flow structure within a vegetation patch in a rubble-bed river. JOURNAL OF HYDRAULICS, 14(2 (142) ), 69-88. SID. https://sid.ir/paper/124173/en

Vancouver: Copy

Jahadi Mahsa, AFZALIMEHR HOSSEIN. Investigation of the flow structure within a vegetation patch in a rubble-bed river. JOURNAL OF HYDRAULICS[Internet]. 2019;14(2 (142) ):69-88. Available from: https://sid.ir/paper/124173/en

IEEE: Copy

Mahsa Jahadi, and HOSSEIN AFZALIMEHR, “Investigation of the flow structure within a vegetation patch in a rubble-bed river,” JOURNAL OF HYDRAULICS, vol. 14, no. 2 (142) , pp. 69–88, 2019, [Online]. Available: https://sid.ir/paper/124173/en

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