Turbulent perturbations of velocity in the conwy estuary |
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| Institution: | 1. College of Engineering and Informatics, National University of Ireland Galway, Ireland;2. MaREI Centre for Marine and Renewable Energy Ireland, National University of Ireland Galway, Ireland;3. Ryan Institute for Environmental, Marine and Energy Research, NUI Galway, Ireland;1. Bayerisches Geoinstitut, Universität Bayreuth, 95440 Bayreuth, Germany;2. State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510460, China;3. Helmholtz Zentrum Potsdam, Deutsches GeoForschungZentrum GFZ, Telegrafenberg, 14473 Potsdam, Germany;1. CAGE - Centre for Arctic Gas Hydrate, Environment and Climate, Department of Geosciences, UiT the Arctic University of Norway in Tromsø, Norway;2. NIOZ Royal Institute for Sea Research, Department of Marine Microbiology and Biogeochemistry, And Utrecht University, P.O. Box 59, 1790, AB Den Burg, Texel, the Netherlands;3. Department of Environmental Sciences, University of Basel, Bernoullistrasse 30, CH-4056, Basel, Switzerland |
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| Abstract: | Field measurements of the vertical and horizontal components of fluid velocity 0·43 m above the bed have been made with an electromagnetic flowmeter in a partially mixed reach of the Conwy estuary for parts of a flood and an ebb tide. The turbulent mean velocity and density fields showed different effects for flood and ebb tides caused by the interaction of shear and the longitudinal density gradient. The turbulent velocity parameters were generally dominated by bed-generated turbulence effects, but significant longer period contributions attributed to the shear-density interactions were detected. The shear-stress measurements made by two independent methods showed good agreement. The results generally show good agreement with previous less complete data. The use of the Richardson number to quantify vertical stability needs further consideration for partially mixed estuarine flows. |
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