Sea Technology

OCT 2013

The industry's recognized authority for design, engineering and application of equipment and services in the global ocean community

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istrator. All steps executed by the system create log fles. Interaction between the models and the external forcing, including publication of results, is performed using NetCDF fles. The model coupling includes a daily download of operational forcing information from GFS and WW3, a nested approach for the low- and high-resolution grids within the WRF and ROMS models, the formatting and delivery of outputs from WRF to ROMS and SWAN, the formatting and delivery of outputs from ROMS to SWAN and the creation of data products for presentation of forecasts and warnings in the coastal forecast and warning system website. It is also used in the oil spill model, inundation simulations and model data comparison tool. WRF The WRF Postprocessor (WPP) program was designed to interpolate WRF output from the native WRF grids to both the standard levels output grid formats in the NetCDF fle format. This fnal NetCDF fle contains radiative fuxes, precipitation, cloud cover, pressure, humidity, temperature and wind components. ROMS The ROMS post-processing merges the hourly output fles of the ARG and DUB domains into a single NetCDF fle for each domain. The variables and levels of interest for visualization in the coastal forecast and warning system website are selected and combined in a new NetCDF fle. These fles contain sea elevation and currents at the surface, middepth and bottom. (Top) An example of a screenshot of the Coastal Forecast and Warning System. (Bottom) Dubai Coastal Forecast and Warning System warning areas, with number of warnings issued between August 2012 and August 2013 shown in parentheses. offshore boundary conditions are defned using deepwater wave parameters obtained from the NOAA NCEP WAVEWATCH III (WW3) global wave model. Wave parameters are extracted from the WW3 forecast dataset for the closest point to the open boundary. Other boundary conditions are supplied by the WRF and ROMS model outputs. Phase Two: Model Coupling and System Integration Data collected from the real-time monitoring program were used to calibrate and validate each individual model, and then WRF, ROMS and SWAN were coupled using a series of shell scripts. These scripts are responsible for execution of the OFS steps and verifcation that each operation has been completed. The verifcation process is used to detect any problems during model execution by confrming fnal fle sizes, which must be the same every day. If a problem occurs, the system sends an e-mail alerting the admin22 st / October 2013 SWAN The SWAN post-processing phase aggregates the ASCII output fles into a single NetCDF fle. This fle contains the signifcant wave height, mean and peak direction, and the mean and peak wave period. Oil Spill Model ASA's OilmapWeb oil spill modeling system is integrated in the coastal forecast and warning system website and connected to the OFS wind and current predictions. The Webbased system allows the user to run an oil spill simulation via a Web browser using web services hosted on a server. The user can enter information on the location, volume and oil type. The Web-based system automatically connects to the latest forecast data for winds and surface currents. The model on the server simulates the weathering and trajectory of the spill and displays the results in the website. Information about every spill simulation is stored in a scenario, which is identifed by a name provided by the user. The scenarios and all of their associated information are stored on the server.

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