A NEW MEASURE FOR DIRECT MEASUREMENT OF THE BED SHEAR STRESS OF WAVE BOUNDARY LAYER IN WAVE FLUME |
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| Authors: | HUO Guang WANG Yi-gang YIN Bao-shu YOU Zai-jin |
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| Affiliation: | 1. Key Laboratory of Coastal Disaster and Defense, Ministry of Education, Hohai University, Nanjin 210098, China;2. Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;3. State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China;4. Coastal Unit., Department of Natural Resources, Dangar NSW, Australia;1. Geological Survey of Ireland, Beggars Bush, Haddington Road, Dublin 4, Ireland;2. Department of Electronic Engineering, Maynooth University, Maynooth, Co. Kildare, Ireland;3. Department of Geosciences, Institute of Marine Sciences, CSIC, Barcelona, Spain;4. Department of Geology and Geophysics, Woods Hole Oceanographic Institution, 266 Woods Hole Road, Woods Hole, MA 02543, USA;5. School of Chemical Sciences, Dublin City University, Glasnevin, Dublin 9, Ireland;1. Department of Naval Architecture and Ocean Engineering, COPPE – Universidade Federal do Rio de Janeiro, Caixa Postal No. 68.508, Rio de Janeiro, RJ CEP 21.945-970, Brazil;2. Laboratory of Ocean Technology - LabOceano - COPPE/UFRJ, Parque Tecnológico do Rio, Rua Paulo Emídio Barbosa, 485-Quadra 07-A, Cidade Universitária, Rio de Janeiro, RJ CEP 21.941-907, Brazil;1. Universidad de la República, Facultad de Ciencias, Igua 4225, Montevideo 11400, Uruguay;2. UPMC Univ Paris 06, CNRS, UMR 7190, Institut Jean le Rond d’Alembert, 2 Place de la gare de Ceinture, 78210 Saint-Cyr-l’Ecole, France;1. Technische Universität München, Chair of Urban Water Systems Engineering, Am Coulombwall, D-85748 Garching, Germany;2. Technische Universität München, Chair for Hydraulic and Water Resources Engineering, Arcisstr. 21, D-80333 München, Germany;3. Karlsruhe Institute of Technology, Engler-Bunte-Institut, Chair of Water Chemistry and Water Technology, Engler-Bunte-Ring 1, D-76131 Karlsruhe, Germany;4. Temple University, Department of Civil and Environmental Engineering Office, EA 912, 1947 North 12th Street, Philadelphia, PA 19122, USA;1. Key Lab of Education Ministry for Power Machinery and Engineering, School of Mechanical Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China;2. Marine Technology Division, Shanghai Ship & Shipping Research Institute, 600 Minsheng Road, Shanghai 200135, China;3. Gas Turbine Research Institute, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China |
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| Abstract: | In this article, a shear plate was mounted on the bottom in a wave flume and direct measurements of the smooth and rough bed shear stress under regular and irregular waves were conducted with the horizontal force exerted on the shear plates by the bottom shear stress in the wave boundary layer. Under immobile bed condition, grains of sand were glued uniformly and tightly onto the shear plate, being prevented from motion with the fluid flow and generation of sand ripples. The distribution of the bottom mean shear stress varying with time was measured by examining the interaction between the shear plate and shear transducers. The relation between the force measured by the shear transducers and its voltage is a linear one. Simultaneous measurements of the bottom velocity were carried out by an Acoustic Doppler Velocimeter (ADV), while the whole process was completely controlled by computers, bottom shear stress and velocity were synchronously measured. Based on the experimental results, it can be concluded that (1) the friction coefficient groews considerably with the increase of the Reynolds number, (2) the shear stress is a function varying with time and linearly proportional to the velocity. Compared with theoretical results and previous experimental data, it is shown that the experimental method is feasible and effective, A further study on the bed shear stress under regular or irregular waves can be carried out. And applicability to the laboratory studies on the initiation of sediments and the measurement of the shear stress after sediment imigration. |
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| Keywords: | wave boundary layer friction coefficient shear plate shear stress Acoustic Doppler Velocimeter (ADV) |
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