Sensitivity analysis of a coupled hydrodynamic-vegetation model using the effectively subsampled quadratures method

Geoscientific Model Development
By: , and 

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Abstract

Coastal hydrodynamics can be greatly affected by the presence of submerged aquatic vegetation. The effect of vegetation has been incorporated into the Coupled-Ocean-Atmosphere-Wave-Sediment Transport (COAWST) Modeling System. The vegetation implementation includes the plant-induced three-dimensional drag, in-canopy wave-induced streaming, and the production of turbulent kinetic energy by the presence of vegetation. In this study, we evaluate the sensitivity of the flow and wave dynamics to vegetation parameters using Sobol' indices and a least squares polynomial approach referred to as Effective Quadratures method. This method reduces the number of simulations needed for evaluating Sobol' indices and provides a robust, practical, and efficient approach for the parameter sensitivity analysis. The evaluation of Sobol' indices shows that kinetic energy, turbulent kinetic energy, and water level changes are affected by plant density, height, and to a certain degree, diameter. Wave dissipation is mostly dependent on the variation in plant density. Performing sensitivity analyses for the vegetation module in COAWST provides guidance for future observational and modeling work to optimize efforts and reduce exploration of parameter space.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Sensitivity analysis of a coupled hydrodynamic-vegetation model using the effectively subsampled quadratures method
Series title Geoscientific Model Development
DOI 10.5194/gmd-2017-107
Volume 10
Year Published 2017
Language English
Publisher EGU
Contributing office(s) Woods Hole Coastal and Marine Science Center
Description 13 p.
First page 4511
Last page 4523