CE04 - Méthodologies, instrumentations, capteurs et solutions pour la transition écologique

A novel ultrasound 2-phase flow instrumentation for SEDiment transport EXPeriments & modelling – 2-phaseSEDEXP

Submission summary

The rate of natural sediments transported by fluvial, estuarine or coastal flows, commonly named the solid transport flow rate, represents the physical quantity to be expressed mathematically as a function of the hydrosedimentary quantities of the flow in order to predict its morphological evolution at short, mid and long terms. It is currently observed that for the majority of these environmental hydrosystems, the quantity of sediments transported during few climatic extreme events per year, correspond to more than 80% of the sediment load transported annually. Coastal erosion, reservoir sedimentation and the intrusion of see waters in many deltas, are direct consequences of these extreme short event dynamics. The dominant role played by these abrupt episodes requires the development of new sediment transport models adapted to such extreme flow regimes. They imply dominant contributions of turbulence induced sediment transport processes affecting both the suspended and bedload sediment transport. These recent findings are based primarely on numerical studies based on advanced turbulence resolved simulations separating the fluid phase from the sediment phase to consider all possible fluid-particle interaction mechanism involved in the transport of sediments. If the two-phase flow approach is at the origin of these recent advances in computational fluid dynamics, the absence of experimental datasets composed of turbulence resolved two-phase flow measurements represents currently a major scientific obstacle towards improved sediment transport models. This scientific barrier cannot be lifted without the emergence of a two-phase flow instrumentation with measurements performances similar to the ones of advanced two-phase flow simulation codes. This project aims to overcome this obstacle by the development of a novel ultrasound two-phase flow measurement method implemented into a new prototype instrumentation as the two-phase (Acoustic Concentration & Velocity Profiler) ACVP-technology, adapted to the study of sediment transport in energetic sediment-laden flows.

Project coordination

David HURTHER (Laboratoire des Ecoulements Géophysiques et Industriels)

The author of this summary is the project coordinator, who is responsible for the content of this summary. The ANR declines any responsibility as for its contents.

Partner

LISIC LISIC LABORATOIRE D'INFORMATIQUE, SIGNAL ET IMAGE DE LA CÔTE D'OPALE
LEGI Laboratoire des Ecoulements Géophysiques et Industriels

Help of the ANR 364,612 euros
Beginning and duration of the scientific project: February 2024 - 48 Months

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