GOW2: A GLOBAL WAVE DATASET FOR COASTAL APPLICATIONS · GOW1 dataset Background Reguero BG,...
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GOW2: A GLOBAL WAVE DATASET
FOR COASTAL APPLICATIONS
Workshop on Waves, Storm surges and Coastal hazards Liverpool, September10-15, 2017
Melisa Menéndez ([email protected]) J. Pérez, A. Espejo, I. J. Losada Environmental Hydraulics Institute. Universidad de Cantabria, Spain
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Background GOW1 dataset
Reguero BG, Menéndez M, Méndez FJ, Mínguez R, Losada IJ. A Global Ocean Wave (GOW) calibrated reanalysis from 1948 onwards. Coastal Engineering (2012) 65:38–55.
Model WW3 (v2.22, ST: Tolman&Chalikov96) Global grid with 1.5º x1º Bathymetry: ETOPO Forcings: 6-h wind fields and Ice of NCEP/NCAR RI.
Configuration
Main characteristics:
Historical Reconstruction: 1948-present (~70 years) Correction of the wave data with satellite
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Background GOW1 dataset
RMSE (m) of altimetry (SAT) and the reanalysis significant wave height data: (a) before (SAT, NC-GOW) and (b) after the calibration process (SAT, GOW).
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Background GOW1.5 dataset
Model WW3 (v4.18, ST: TEST451) Coastal European resol. : 1/8º, 1/16º Forcings: 1-h wind fields and Ice from CFSR
Configuration
BIAS (m)
CORR
Main characteristics: A homogenous wave hindcast covering the whole European coasts and seas High skill to reproduce historical extreme wave events.
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Background GOW1.5 dataset
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Background GOW1.5 dataset
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Background GOW1.5 dataset
Perez J, Menendez M, Camus P, Mendez FJ, Losada IJ (2015). Statistical multi-model climate projections of surface ocean waves in Europe. Ocean Modelling, 96, 161–170. doi: 10.1016/j.ocemod.2015.06.001
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GOW2 Setup • Model: WavewatchIII (v4.18)
• Formulations for simulating physical processes - ST parameterization: TEST451 (Ardhuin et al. 2010) - Continuous sea-ice concentrations treatment
from 0.25 (no effect) to 0.75 (total blocking). - SHOWEX movable-bed bottom friction (Ardhuin et al. 2003) - Obstructions. Wave energy flux attenuation across discrete grid cell boundaries (Tolman, 2003) - Coastline reflection (0.05) - Non-linear wave-wave interactions: DIA (Hasselmann et al. 1985) - Shallow water depth breaking and shallow water limiter for maximum energy - A third-order Ultimate Quickest propagation scheme with the correction for the garden sprinkler effect proposed by Tolman (2002)
• Forcings and boundaries - CFSR and CFSv2 wind fields and ice coverage
Wind- wave growth parameter (betamax): 1.26 - Bathymetry: ETOPO. Coastline: GSHHG
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GOW2 Setup
Shelf domain is designed to include all grid-points at depths below 200 m and the surrounding area within 1.5 deg.
4 domains (2 way nesting)
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GOW2 dataset Outputs (1979-present)
15 sea state parameters (hourly) for all the ocean grid-points. 3-hourly wave spectra (at more than 40000 locations along the world coastlines with a spacing of 0.25º).
[32 frequencies and 24 directions]
Bahamas grid-point
Chilean coast Filippines (Haiyan) Bahamas grid-point
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GOW2 performance Validation against buoys
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Validation against buoys GOW2 performance
167 buoy records (with at least 3 recorded years) Source: CEFAS, INCOIS, Irish Weather Buoy Network, NOAA, NBDC and REDEXT.
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Validation against observations (in-situ & remote)
GOW2 performance
Satellite data: Intercalibrated multimission altimeter data (1992-2015)
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Validation against observations (in-situ & remote)
GOW2 performance
Satellite data: Intercalibrated multimission altimeter data (1992-2015)
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Validation against observations (in-situ & remote)
GOW2 performance
Satellite data: Intercalibrated multimission altimeter data (1992-2015)
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Validation focusing on Tropical Cyclones GOW2 performance
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Validation focusing on Tropical Cyclones GOW2 performance
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Wave Climatologies Mean monthly wave energy (of the most energetic month)
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Wave Climatologies 50 year significant wave height return value
Perez, J., Menendez, M., & Losada, I. J. GOW2: A global wave hindcast for coastal applications. Coastal Engineering (2017), 124, 1-11.
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Wave Spectrum analysis - Preliminary analysis - Moments are estimated from the raw spectra-> Hs and Tp - JONSWAP theoretical spectrum is evaluated:
How good is gamma=3.3? What is the best gamma? How good fit the JONSWAP theoretical spectrum? (% overlapping area)
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Wave Spectrum analysis
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agreement JONSWAP (γ=3.3)
Wave Spectrum analysis Agreement JONSWAP
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GOW2: A GLOBAL WAVE DATASET FOR COASTAL APPLICATIONS