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COUPLING A BOUNDARY LAYER WALL SHEAR-STRESS MODEL WITH FIELD EXPERIMENTS IN A SHALLOW TIDAL RIVER

Romain Mathis
Laboratoire de Mecanique de Lille CNRS UMR 8107, University Lille Nord de France 59655 Villeneuve d'Ascq, France

Ivan Marusic
Department of Mechanical Engineering, The University of Melbourne, Melbourne, VIC, 3010, Australia

Nicole L. Jones
School of Environmental Systems Engineering and UWA Oceans Institute University of Western Australia Crawley, Western Australia, Australia

Gregory N. Ivey
School of Environmental Systems Engineering and UWA Oceans Institute University of Western Australia Crawley, Western Australia, Australia

Abstract

Recently, Mathis et al. (2011) developed a conceptual approach that is able to predict instantaneous wall-shear stress fluctuations in turbulent boundary layers. This approach embeds the scale interaction mechanisms, namely superposition and modulation, into a wall-model capable of predicting the fluctuating component of the streamwise wall-shear stress. The present study investigates the potential benefits of this new approach for research on environmental flows, where near-wall information is often missing. The database considered here comes from field measurements using acoustic Doppler velocimeters carried out in a shallow tidal river (Suisun Slough in North San Francisco Bay). Amongst the data, only the sets having defined boundary layer properties are retained. The model, applied to these selected cases, shows promising results. Despite significant uncertainties in the field measurements, statistical analysis and comparisons of energy content demonstrate that predictions using these data agree relatively well with laboratory predictions and DNS results.