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Alex Fisher

Research Scientist/Engineer Senior




B.S. Civil & Environmental Engineering, University of Washington, 2011

M.S. Civil & Environmental Engineering. Specialization: Environmental Fluid Mechanics & Hydrology, Stanford University, 2012

Ph.D. Marine, Estuarine and Environmental Science, University of Maryland, 2017


2000-present and while at APL-UW

Rapid deterministic wave prediction using a sparse array of buoys

Fisher, A., J. Thomson, and M. Schwendeman, "Rapid deterministic wave prediction using a sparse array of buoys," Ocean Eng., 228, doi:10.1016/j.oceaneng.2021.108871, 2021.

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15 May 2021

A long-standing problem in maritime operations and ocean development projects has been the prediction of instantaneous wave energy. Wave measurements collected using an array of freely drifting arrays of Surface Wave Instrument Float with Tracking (SWIFT) buoys are used to test methods for phase-resolved wave prediction in a wide range of observed sea states. Using a linear inverse model in directionally-rich, broadbanded wave fields can improve instantaneous heave predictions by an average of 63% relative to statistical forecasts based on wave spectra. Numerical simulations of a Gaussian sea, seeded with synthetic buoys, were used to supplement observations and characterize the spatiotemporal extent of reconstruction accuracy. Observations and numerical results agree well with theoretical deterministic prediction zones proposed in previous studies and suggest that the phase-resolved forecast horizon is between 1–3 average wave periods for a maximum measurement interval of 10 wave periods for ocean wave fields observed during the experiment. Prediction accuracy is dependent on the geometry and duration of the measurements and is discussed in the context of the nonlinearity and bandwidth of incident wave fields.

Acoustics Air-Sea Interaction & Remote Sensing Center for Environmental & Information Systems Center for Industrial & Medical Ultrasound Electronic & Photonic Systems Ocean Engineering Ocean Physics Polar Science Center