caa a22 4500 445874619 CHVBK 20180317145524.0 cr unu---uuuuu 170323e20110601xx s 000 0 eng 10.1007/s10652-010-9197-5 doi (NATIONALLICENCE)springer-10.1007/s10652-010-9197-5 Folkard Andrew Lancaster Environment Centre, Lancaster University, LA1 4YQ, Lancaster, UK aut Flow regimes in gaps within stands of flexible vegetation: laboratory flume simulations [Elektronische Daten] [Andrew Folkard] Analyses of results from laboratory flume experiments are presented in which flow within gaps in canopies of flexible, submerged aquatic vegetation simulations is investigated. The aims of the work are (a) to identify the different flow regimes that may be found within such gaps, using Morris' classical definitions of skimming flow, wake interference flow and isolated roughness flow as a template, (b) to determine the parameter space in which those flow regimes are most consistently delineated, and (c) to provide quantitative measurements of the loci of each flow regime within that parameter space for these experiments. The sedimentary and biological implications of each flow regime are also discussed. The results show that five flow regimes may be identified, expanding on Morris' original set of three. The five are: (i) skimming flow; (ii) recirculation flow; (iii) boundary layer recovery; (iv) canopy through-flow; and (v) isolated roughness flow, the last being assumed to occur in some cases though it is not directly observed in these experiments. A Reynolds number based on the canopy overflow speed and the gap depth, and the gap aspect ratio are found to be the key parameters that determine these flow regimes, though a Froude number is found to be important for determining bed shear stress, and the length of leaves overhanging the gap from the upstream canopy is found to be important in determining the location of flow recirculation cells within the gap. Springer Science+Business Media B.V., 2010 Submerged aquatic vegetation nationallicence Vegetation patches nationallicence Flow regimes nationallicence Bed shear stress nationallicence Shear layer separation nationallicence Turbulent boundary layer nationallicence Environmental Fluid Mechanics Springer Netherlands 11/3(2011-06-01), 289-306 1567-7419 11:3<289 2011 11 10652 https://doi.org/10.1007/s10652-010-9197-5 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10652-010-9197-5 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Folkard Andrew Lancaster Environment Centre, Lancaster University, LA1 4YQ, Lancaster, UK aut NATIONALLICENCE 773 0- Environmental Fluid Mechanics Springer Netherlands 11/3(2011-06-01), 289-306 1567-7419 11:3<289 2011 11 10652 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer