{"title":"Grid stirred turbulence: applications to the initiation of sediment motion and lift-off studies","authors":"P. Medina, M.A. Sánchez, J.M. Redondo","doi":"10.1016/S1464-1909(01)00010-7","DOIUrl":null,"url":null,"abstract":"<div><p>A laboratory experimental set - up for studying the behaviour of sediment in presence of a turbulent field with zero mean flow is presented. Particular interest is shown on the initiation of sediment motion and in the sediment lift - off. Some examples of the results obtained with this set-up are shown.</p><p>A turbulent velocity <em>u</em>′ lower than that u estimated by the Shield diagram is required to start sediment motion. The minimum <em>u</em>′ required to start sediment lift - off, is a function of sediment size, cohesivity and resting time. The lutocline height depends on <em>u</em>′, and the vorticity at the lutocline seems constant for a fixed sediment size. Combining grid stirring and image analysis, sediment vertical fluxes and settling speeds could be measured.</p></div>","PeriodicalId":101025,"journal":{"name":"Physics and Chemistry of the Earth, Part B: Hydrology, Oceans and Atmosphere","volume":"26 4","pages":"Pages 299-304"},"PeriodicalIF":0.0000,"publicationDate":"2001-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1464-1909(01)00010-7","citationCount":"27","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Physics and Chemistry of the Earth, Part B: Hydrology, Oceans and Atmosphere","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1464190901000107","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 27
Abstract
A laboratory experimental set - up for studying the behaviour of sediment in presence of a turbulent field with zero mean flow is presented. Particular interest is shown on the initiation of sediment motion and in the sediment lift - off. Some examples of the results obtained with this set-up are shown.
A turbulent velocity u′ lower than that u estimated by the Shield diagram is required to start sediment motion. The minimum u′ required to start sediment lift - off, is a function of sediment size, cohesivity and resting time. The lutocline height depends on u′, and the vorticity at the lutocline seems constant for a fixed sediment size. Combining grid stirring and image analysis, sediment vertical fluxes and settling speeds could be measured.
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