NUMERICAL SENSITIVITY EVALUATION OF THE PHASE-RESOLVING WAVE MODEL SWASH AND ITS APPLICABILITY IN AN OPERATIONAL FORECAST ENVIRONMENT FOR REEF-LINED COASTS
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2024
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An evaluation of the Simulating WAves till SHore (SWASH, Zijlema, 2011) spectral wave-flow model on the north shore of Oahu, Hawaii, was conducted to determine sensitivity to various numerical settings and grid configurations. It also aimed to assess what could be achievable in an operational forecasting environment, such as NOAA’s National Weather Service Forecast Offices, with regard to computational expenses involved. Spatial resolution, water level, boundary conditions, friction, and the computational time window were analyzed and compared across a two-dimensional (2D) grid and along a one-dimensional transect. Water elevations derived from these tests were evaluated at a nearshore point that remained wet throughout the simulations and used to compare bulk-averaged output parameters that included: sea and swell height, wave setup, infragravity wave height, and the two-percent exceedance wave height. The sensitivity of these bulk quantities to model framework decisions that impact computational expense pose immense challenges for implementation in an operational forecast environment. We present results demonstrating how forecast sites can balance operational feasibility and accuracy.
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Ocean engineering, Coastal Inundation, Phase-Resolving, Sea Level Rise, SWASH, Wave Modeling, Wave Runup
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62 pages
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