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Discussion papers | Copyright
https://doi.org/10.5194/nhess-2018-23
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 01 Feb 2018

Research article | 01 Feb 2018

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This discussion paper is a preprint. It is a manuscript under review for the journal Natural Hazards and Earth System Sciences (NHESS).

Implementation and validation of a new operational wave forecasting system of the Mediterranean Monitoring and Forecasting Centre in the framework of the Copernicus Marine Environment Monitoring Service

Michalis Ravdas1,*, Anna Zacharioudaki1,*, and Gerasimos Korres1 Michalis Ravdas et al.
  • 1Hellenic Centre for Marine Research, P.O. Box 712, 19013 Anavissos, Hellas
  • *These authors contributed equally to this work.

Abstract. Within the framework of the Copernicus Marine Environment Monitoring Service (CMEMS) an operational wave forecasting system for the Mediterranean Sea has been implemented by the Hellenic Centre for Marine Research (HCMR) and evaluated through a series of pre-operational tests and subsequently for one full year of simulations (2014). The system is based on the WAM model and it has been developed as a nested sequence of two computational grids to ensure that occasional remote swell propagating from the North Atlantic is correctly entering into the Mediterranean Sea through the Gibraltar Strait. The Mediterranean model has a grid spacing of 1/24°. It is driven with 6-hourly analysis and 5-days forecast 10m ECMWF winds. It accounts for shoaling and refraction due to bathymetry and surface currents which are provided in off-line mode by CMEMS. Extensive statistics on the system performance have been calculated by comparing model results with in-situ and satellite observations. Overall, the significant wave height is accurately simulated by the model while less accurate but reasonably good results are obtained for the mean wave period. In both cases, the model performs optimally at offshore wave buoy locations and well-exposed Mediterranean sub-regions. Within enclosed basins and near the coast, unresolved topography by the wind and wave models and fetch limitations cause the wave model performance to deteriorate. Model performance is better in winter when the wave conditions are well-defined. On the whole, the new forecast system provides reliable forecasts. Future improvements include data assimilation and higher resolution wind forcing.

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Latest update: 17 Aug 2018
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Short summary
A high-resolution operational wave forecasting system for the Mediterranean Sea has been developed within the framework of the Copernicus Marine Environment Monitoring Service, which provides open, cost-free and quality controlled products. The system accounts for waves arriving through the Gibraltar Straight and for the effect of surface currents on waves. It provides accurate results over well-exposed locations and satisfactory results within enclosed basins and near the coast.
A high-resolution operational wave forecasting system for the Mediterranean Sea has been...
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