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- W2331496978 abstract "Studies on coastal processes and especially on sediment transport, come from numerical studies, in situ measurements and laboratory experiments. They have many goals such as determination of fluxes, quantification of transport, accretion and scouring mechanism understanding... In the past twenty years, turbulence has reached an important place on this topic. Until 1980’, its influence was supposed to be low. Nevertheless, different studies recently show that, in turbulent flow, particle settling velocity do not follow Oseen or Stokes laws, established for laminar flow (Dietlin). Then, one has to take into account turbulence properties for studying sediment movement in turbulent flows (Belorgey and al). Particularly, turbulent spatial scales are related to sediment size and influence settling velocity of sediment and path (Cadiergue). In the last years, turbulence structure has only been studied in permanent flows. The aim of this experimental study is to describe turbulent scale evolutions in case of permanent and wave-current interaction flows. We reproduce in a flume a grid-generated turbulence. Grid is a square mesh grid and is located in a cross section of the flume. We particularly guide our interest in free surface and swell condition effects on them. With this end in view, we measure velocity fields with a Laser Doppler Velocimeter system. Data processing is based on isotropic turbulence theory (for permanent flow) allowing Taylor hypothesis resort (id" @default.
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- W2331496978 date "2002-10-25" @default.
- W2331496978 modified "2023-09-26" @default.
- W2331496978 title "Turbulence Structure in Free-Surface Channel Flows" @default.
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- W2331496978 doi "https://doi.org/10.1061/40655(2002)104" @default.
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