ODYSSEA GREECE Waves

Overview

For the operational wave modelling at the ODYSSEA Greece Observatory, SWAN model is implemented. The computational domain and grid resolution of the Thracian Sea wave model follows that of the Thracian Sea hydrodynamic model (1/100° or ~1.1km). The bathymetry is similar to the bathymetry of Delft3D-FLOW. Meteorological forcing is provided by the NOAA Global Forecast System (GFS) hourly forecasts at 0.125° resolution. A time and space varying boundary condition is imposed at the southern boundary, retrieving data from the CMEMS Med-MFC WAM cycle 4.6.2 wave model at a resolution of 1/24°. These data consist of hourly significant wave height, peak period and wave direction time-series. JONSWAP spectrum was chosen as the appropriate spectral shape and for the cosine power representing the directional spreading.
The model runs in non-stationary mode and currents are not included as input for the wave computations. The following SWAN model settings related to physics are applied: the BSBT numerical scheme is used; the Komen formulation for wind input and white capping is applied; quadruplet non-linear wave interactions are computed using the Discrete Interaction Approximation (DIA); the computation of depth-induced wave breaking in shallow water is set to BKD rather than constant (BKD indicates that the breaker index scales with both the bottom slope and the dimensionless depth); for bottom friction the JONSWAP formulation is used with the default friction coefficient of 0.038 m2/s3; triad wave-wave interactions and diffraction are counted for. The Thracian Sea wave model produces 2 days of forecast, which is initialised by a 1 day hindcast. The frequency of forecast release is daily, producing 2D hourly fields of wave parameters (Significant Wave Height, Mean Wave Period, Mean Wave Direction, Directional Spreading).

DISCLAIMER: After 30th November 2021 this product will not be updated. This product is for demonstration purposes only. A simplified model configuration was used without full validation. It aims to demonstrate that a chain of Delft3D coastal models (hydrodynamics-waves-water quality) can be operationally run using the Delft-FEWS workflow manager and outputs can be visualized in Marinomica.

Variables

sea_surface_swell_wave_significant_height
sea_surface_wave_directional_spread
sea_surface_wave_from_direction
sea_surface_wave_mean_period
sea_surface_wave_period_at_variance_spectral_density_maximum
sea_surface_wave_significant_height

Geographical coverageTemporal coverage   
Latitude = 40.67/41.41; Longitude = 24.27/27.41

Vertical coverage
0

Spatial resolution
1/100 degree

Update frequency
daily

Producer
ODYSSEA