Morphodynamic modeling using the Telemac finite-element system

C. Villaret (1) , J. M. Hervouet , R. Kopmann , U. Merkel , A. G. Davies

1 LHSV - Laboratoire d'Hydraulique Saint-Venant / Saint-Venant Laboratory for Hydraulics

The open-source finite-element system Telemac has been applied to simulate various complex hydrodynamic and morphodynamic situations including waterways, curved channels, recirculating flows and wave-induced littoral transport. In the applications presented here, the sediment transport model is mainly restricted to the transport of non-cohesive sediments, which relies on classical semi-empirical concepts including sand grading effects, parameterization of secondary currents and wave effects. In comparison with other comprehensive modeling systems (Delft-3D, Mike-21, etc.), the main originality lies in the efficiency and flexibility of the finite elements. Thanks to the optimization of numerical schemes, parallelism, as well as tremendous progress in the performance of computers, bed evolution can be calculated on basin scale (10-100. km) and for the medium term (years to decades), without the use of hydrodynamic filtering methods. As a novelty in release 6.0, we present a method of feedback for the bed roughness, which reduces uncertainty in the prediction of both transport rates and flow velocities. © 2011 Elsevier Ltd.

Mots clés: Bed roughness; Littoral transport; Long-term morphodynamics; Non-cohesive sediment; River flow; Secondary currents; Morphodynamics; Sediment transport; Sedimentology; Fluid dynamics; channel flow; computer simulation; finite element method; flow velocity; hydrodynamics; littoral environment; numerical model; optimization; performance assessment; prediction

Domaines: Sciences de l'ingénieur [physics]

C. Villaret, J. M. Hervouet, R. Kopmann, U. Merkel, A. G. Davies. Morphodynamic modeling using the Telemac finite-element system. Computers & Geosciences, 2013, 53, pp.105-113. ⟨10.1016/j.cageo.2011.10.004⟩. ⟨hal-00947782⟩