Revista
Recursos Hídricos
DOI:10.5894/rh42n1-cti12
Este artigo é parte integrante da Revista Recursos Hídricos, Vol. 42, Nº 1, 113-120, março de 2021.
Influência da vegetação nas transferências de quantidade de movimento laterais
Influence of vegetation on lateral momentum transfers
Cátia TABORDA1, Cristina FAEL1, César SANTOS1, Ana RICARDO2, Rui FERREIRA3
1 Universidade de Beira Interior - CMADE, Rua Marquês D’Avila e Bolama, 6201-001 Covilhã, [email protected], [email protected], [email protected]
2 CERIS, Avenida Rovisco Pais 1, 1049-003 Lisboa, [email protected] (Associado)
3 CERIS - Instituto Superior Técnico, Avenida Rovisco Pais 1, 1049-001 Lisboa, [email protected] (Associado)
RESUMO
Nesta comunicação analisam-se os resultados experimentais obtidos num canal parcialmente vegetado, constituído por um corredor de matriz escalonada emergente rígida, visando estudar a influência da vegetação nas transferências laterais de massa e quantidade de movimento. É ainda quantificada a espessura da camada de mistura, através de modelos teóricos, dado que desempenha um papel significativo nessas transferências. A análise é complementada com o estudo da presença das estruturas coerentes de larga escala que promovem a transferência de massa e de quantidade de movimento através do escoamento turbulento que ocorre entre o canal central e o corredor vegetado.
Palavras-chave: canal parcialmente vegetado; vegetação emersa rígida; interface; transferências laterais.
ABSTRACT
In this paper, the experimental results obtained in a partially vegetated channel, consisting of an area with emergent and rigid stems in a staggered pattern, are analyzed in order to study the influence of vegetation on the lateral mass and momentum transfers. The mixing layer width is also quantified, using theoretical models, as it plays a significant role in these transfers. The analysis is complemented with the study of the presence of coherent large-scale structures that promote the mass and momentum transfers through the turbulent flow that occurs between the central channel and the vegetated area.
Keywords: partially vegetated channel; rigid emergent vegetation; interface; lateral transfers.
Barbarutsi A, Chu VH (1998) Modeling Transverse Mixing Layer in Shallow Open-Channel Flows. In: Journal of Hydraulic Engineering, 124(7) doi: 10.1061/(ASCE)0733-9429(1998)124:7(718)
Brown G, Roshko A (1974). On density effects and large structure in turbulent mixing layers. In: Journal of Fluid Mechanics, 64(4), 775-816. doi:10.1017/S002211207400190X
Caroppi G, Gualtieri P, Fontana N, Giugni M (2020). Effects of vegetation density on shear layer in partly vegetated channels. In: Journal of Hydro-environment Research, 30, 82-90. doi:10.1016/j.jher.2020.01.008
Dupuis, V., Proust, S., Berni, C., Paquier, A., (2017) Mixing layer development in compound channel flows with submerged and emergent rigid vegetation over the floodplains. In: Exp. Fluids 58 Ghisalberti M, Nepf H (2002) Mixing layers and coherent structures in vegetated aquatic flows. In: Journal of Geophysical Research, 107(C2), 3011. doi:10.1029/2001JC000871
Ghisalberti, M., and H. Nepf (2006), The structure of the shear layer over rigid and flexible canopies, In: Environ. Fluid Mech., 6(3), 277 – 301, doi:10.1007/s10652-006-0002-4.
Goring DG, Nikora VI (2002) Despiking acoustic doppler velocimeter data. In: Journal of Hydraulic Engineering, 128(1), 117–126. doi:10.1061/(ASCE)0733-9429(2002)128:1(117)
Maji S, Hanmaiahgari PR, Balachandar R, Pu JH, Ricardo AM, Ferreira RML (2020) A Review on Hydrodynamics of Free Surface Flows in Emergent Vegetated Channels. In: Water 2020. 12 (4). 1218. doi:10.3390/w12041218
Monin, A. S., and A. M. Yaglom (1972) Statistical Fluid Mechanics: Mechanics of Turbulence. Vol. 1. MIT Press, 769 pp. doi:10.1126/science.176.4034.503
Nepf HM (1999) Drag, Turbulence, and diffusion in flow through emergent vegetation. In: Water Resour. Res. 35, 479–489. doi:10.1029/1998WR900069
Nepf, H.M. and Vivoni, E.R. (2000) Flow structure in depth-limited, vegetated flow. In: Journal of Geophysical Research 105, 28547–28557. doi:10.1029/2000JC900145
Nezu I, Sanjou M (2008) Turbulence structure and coherent motion in vegetated canopy open-channel flows. In: Journal of Hydro-environment Research. 2(2) 62-90. doi:10.1016/j.jher.2008.05.003
Nezu I (2005) Open-Channel Flow Turbulence and Its Research Prospect in the 21st Century. In: Journal of Hydraulic Engineering, 131(4). doi:10.1061/(ASCE)0733-9429(2005)131:4(229)
O’Neill PL, Nicolaides D, Honnery D, Soria J (2004) Autocorrelation Functions and the Determination of Integral Length with Reference to Experimental and Numerical Data. In: Proceedings of 15th Australasian Fluid Mechanics Conference, University of Sydney, Sydney, 13–17 December 2004.
Poggi D, Porporato A, Ridolfi L, Albertson JD, Katul, GG (2004) The effect of vegetation density on canopy sub-layer turbulence. In: Boundary Layer Meteorol., 111, 565–587. doi:10.1023/B:BOUN.0000016576.05621.73
Pope S (2000) Turbulent Flows. In: Cambridge: Cambridge University Press. doi:10.1017/CBO9780511840531
Raupach MR, Finnigan JJ, Brunet Y (1996) Coherent eddies and turbulence in vegetation canopies: The mixing layer analogy. In: Boundary-Layer Meteorolgy, 78, 351–382. doi:10.1007/bf00120941 Taylor GI (1938) The Spectrum of Turbulence. In: Proceedings of the Royal Society of London, Series A164, 476–490. doi:10.1098/rspa.1938.0032
Wahl TL (2003) Discussion of “Despiking acoustic doppler velocimeter data” by Derek G. Goring and Vladimir I. Nikora. In: Journal of Hydraulic Engineering,129(6), 484−487, doi:10.1061/(ASCE)0733-9429(2003)129:6(484)
White B, Nepf H (2003) Scalar transport in random cylinder arrays at moderate Reynolds number. In: Journal of Fluid Mechanics, 487, 43-79. doi:10.1017/S0022112003004579
White B, Nepf H (2007) Shear instability and coherent structures in shallow flow adjacent to a porous layer. In: Journal of Fluid Mechanics, 593, 1–32. doi:10.1017/S0022112007008415
White B, Nepf H (2008) A vortex-based model of velocity and shear stress in a partially vegetated shallow channel. In: Water Resources Research, 44, W01412. doi:10.1029/2006WR005651
Zhang H, Wang Z, Dai L, Xu W (2015) Influence of Vegetation on Turbulence Characteristics and Reynolds Shear Stress in Partly Vegetated Channel. In: ASME, Journal Fluids Engineering, 137(6): 061201, 1−8. doi:10.1115/1.4029608
Download 1122KB, PDF)