Effect of submerged aquatic vegetation on turbulence induced by an oscillating grid |
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| Authors: | Dolors Pujol Jordi ColomerTeresa Serra Xavier Casamitjana |
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| Institution: | Department of Physics, Escola Politècnica – II, Campus Montilivi, 17071 Girona, Spain |
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| Abstract: | In wetlands wind-induced turbulence significantly affects the bottom boundary, and the interaction between turbulence and plant canopies is therefore particularly important. The aim of this study is to advance understanding of the impact of this interaction in submerged aquatic vegetation (SAV)1 on vertical mixing in a fluid dominated by turbulence. Wind-generated turbulence was simulated in the laboratory using an oscillating grid. We quantify the vertical distribution of turbulent kinetic energy (TKE)2 above and within different types of vegetation, measured by an acoustic Doppler velocimeter. Experimental conditions are analysed in two canopy models (rigid and semi-rigid) with seven solid plant fractions (SPFs)3, three stem diameters (d)4 and three oscillation grid frequencies (f)5 and four natural SAVs (Cladium mariscus, Potamogeton nodosus, Myriophyllum verticillatum and Ruppia maritima). |
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| Keywords: | Wetlands Oscillating grid Model canopies Submerged aquatic vegetation Turbulence Sheltering |
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