Evaluating TELEMAC2D modeling accuracy by comparing with UK benchmark study results

TELEMAC is an integrated suite of solvers for modeling free-surface flow in two-dimension (2D) or three-dimension (3D), including hydrodynamic, water quality, sediment transport, and wave processes. The source code of TELEMAC is made available free of charge, under license General Public License (GPL version 3). TELEMAC supports finite element method or finite volume method to solve the set of governing equations for the modeled processes (e.g. hydrodynamic coupling with water quality). It has been successfully used in many studies in France, Germany, UK, Canada, China, among many other countries. Currently, there is little study on the comparison of TELEMAC with other similar modeling packages. This paper tries to fill this gap and compares TELELMAC2D results with the UK benchmark study. TELEMAC2D is the 2D hydrodynamic module in the TELEMAC suite, and solves the depth-averaged shallow water equations on a triangular mesh. The UK benchmark study compared the results of various 2D modeling packages for nine tests. Each test is designed to evaluate a specific capability of packages with the same specification on input DEM data, mesh dimensions, Manning’s N coefficient, and simulation duration. TELEMAC2D models were created for each test, except for tests 7 and 8B since both require 1D/2D linked modeling capacity that is currently missing in TELEMAC. The comparison demonstrates TELEMAC2D can generate results matching the benchmark models very well.

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