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Laboratoire d’Etudes en Géophysique et Océanographie Spatiales

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by ECOLA last modified Sep 12, 2014 11:09 AM

Waves-current interactions - on-going project



 In the past ten years, robust formalisms have emerged to model the three-dimensional effect of waves on the ocean circulation, especially in the nearshore region. Our desire to clarify the different choices and move forward on the convergence of formalisms materialized in 2014 through a French LEFE project named COMODO-WAVES bringing together developers of 3D coastal ocean circulation models. The continuation of this project will bring together the scientific community traditionally working separately on shelf and nearshore oceanography, with their different approaches and models: 2D or 3D equations, structured or unstructured grids. Our objectives are also part of longstanding international collaborations with UCLA.

The project relies on a realistic test case (Biscarosse beach off the Aquitanian coast) to evaluate the performance of different approaches to modeling. The first task involves the comparison of 2D and 3D models and those with structured and unstructured meshes (accuracy and computational cost) in order to better assess the quality and defects of different approaches. The second task concerns the quantification of intrinsic and forced components of the Very Low Frequency (VLF) variability of coastal current systems (rip currents for that matter). The answer to such questions will also determine the future of coastal models (e.g., promoting phase resolving or averaging models). A last objective is the optimization of the use of coastal video imaging for modeling the coastal flow and morphodynamics, including methods of data assimilation.

Contact: P. Marchesiello (LEGOS/IRD)

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