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3D Versus 2D Calibration of a 3D Hydrodynamic Model

Author(s): Parna Parsapour-Moghaddam, Colin D. Rennie

Linked Author(s): Colin Rennie

Keywords: 3D Hydrodynamic modeling, 3D calibration, 2D calibration, ADCP, natural meandering river

Abstract: This study proposes a novel calibration approach to account for the spatial distribution of the fully three-dimensional (3D) flow field. A natural meandering river is simulated using the 3D hydrodynamic model. Fully 3D distributed velocities are employed which are obtained from spatially intensive acoustic Doppler current profiler (ADCP) surveying. Sensitivity analysis is performed on horizontal eddy viscosity as well as the manning roughness to investigate which of these parameters could more influence the model. In the present study, comparison is made between the results of a conventional 2D calibration versus 3D calibration approach. It is shown that the 3D calibration method results in a different optimized model parameterization than the 2D calibration. The 2D calibration approach yields horizontal eddy viscosity of 10m^2/s, while the proposed 3D calibration approach results in the horizontal eddy viscosity of 0. 1m^2/s. The proposed methodology could improve the calibration of a 3D hydro-morphodynamic model in terms of specifically parameterizing it to simulate fully 3D flow field. Moreover, it allows for spatially distributed calibration parameters to better represent physical and turbulent characteristics of the flow. The results of this study suggest that an appropriately calibrated 3D hydrodynamic model could more accurately predict the hydrodynamic processes in a natural meandering river

DOI:

Year: 2017

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