caa a22 4500 445874759 CHVBK 20180317145524.0 cr unu---uuuuu 170323e20111001xx s 000 0 eng 10.1007/s10652-011-9213-4 doi (NATIONALLICENCE)springer-10.1007/s10652-011-9213-4 Exchange flow between open water and floating vegetation [Elektronische Daten] [Xueyan Zhang, Heidi Nepf] This study describes the exchange flow between a region with open water and a region with a partial-depth porous obstruction, which represents the thermally-driven exchange that occurs between open water and floating vegetation. The partial-depth porous obstruction represents the root layer, which does not penetrate to the bed. Initially, a vertical wall separates the two regions, with fluid of higher density in the obstructed region and fluid of lower density in the open region. This density difference represents the influence of differential solar heating due to shading by the vegetation. For a range of root density and root depths, the velocity distribution is measured in the lab using PIV. When the vertical wall is removed, the less dense water flows into the obstructed region at the surface. This surface flow bifurcates into two layers, one flowing directly through the root layer and one flowing beneath the root layer. A flow directed out of the vegetated region occurs at the bed. A model is developed that predicts the flow rates within each layer based on energy considerations. The experiments and model together suggest that at time- and length-scales relevant to the field, the flow structure for any root layer porosity approaches that of a fully blocked layer, for which the exchange flow occurs only beneath the root layer. Springer Science+Business Media B.V., 2011 Exchange flow nationallicence Vegetation nationallicence Lakes nationallicence Density-driven exchange nationallicence Porous obstruction nationallicence Zhang Xueyan Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA aut Nepf Heidi Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA aut Environmental Fluid Mechanics Springer Netherlands 11/5(2011-10-01), 531-546 1567-7419 11:5<531 2011 11 10652 https://doi.org/10.1007/s10652-011-9213-4 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10652-011-9213-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Zhang Xueyan Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA aut NATIONALLICENCE 700 1- Nepf Heidi Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA aut NATIONALLICENCE 773 0- Environmental Fluid Mechanics Springer Netherlands 11/5(2011-10-01), 531-546 1567-7419 11:5<531 2011 11 10652 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer