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Efficient modeling of wave generation and propagation in a semi-enclosed estuary

June 23, 2023

Accurate, and high-resolution wave statistics are critical for regional hazard mapping and planning. However, long-term simulations at high spatial resolution are often computationally prohibitive. Here, multiple rapid frameworks including fetch-limited, look-up-table (LUT), and linear propagation are combined and tested in a large estuary exposed to both remotely (swell) and locally generated waves. Predictions are compared with observations and a traditional SWAN implementation coupled to a regional hydrodynamic model. Fetch-limited and LUT approaches both perform well where local winds dominate with errors about 10%–20% larger than traditional SWAN predictions. Combinations of these rapid approaches with linear propagation methods where remotely generated energy is present also perform well with errors 0%–20% larger than traditional SWAN predictions. Model–model comparisons exhibit lower variance than comparisons to observations suggesting that, while model implementation impacts prediction skill, model boundary conditions (winds, offshore waves) may be a dominant source of error. Overall results suggest that with a relatively small loss in prediction accuracy, simulations computation cost can be significantly reduced (by 2–4 orders of magnitude) allowing for high resolution and long-term predictions to adequately define regional wave statistics.

Publication Year 2023
Title Efficient modeling of wave generation and propagation in a semi-enclosed estuary
DOI 10.1016/j.ocemod.2023.102231
Authors Sean C. Crosby, Cornelis M. Nederhoff, Nathan R. VanArendonk, Eric E. Grossman
Publication Type Article
Publication Subtype Journal Article
Series Title Ocean Modeling
Index ID 70251488
Record Source USGS Publications Warehouse
USGS Organization Pacific Coastal and Marine Science Center