Bolanos, R.

Du, Jianting

Larsén, Xiaoli Guo

Online Research Database In Technology

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Downloaded from orbit.dtu.dk on: Dec 21, 2017A Coupled Atmospheric and Wave Modeling System for Storm SimulationsDu, Jianting; Larsén, Xiaoli Guo; Bolanos, R.Publication date:2015Document VersionPublisher's PDF, also known as Version of recordLink back to DTU OrbitCitation (APA):Du, J., Larsén, X. G., & Bolanos, R. (2015). A Coupled Atmospheric and Wave Modeling System for StormSimulations. Poster session presented at EWEA Offshore 2015 Conference, Copenhagen, Denmark.A coupled atmospheric and wave modeling system for storm simulationsJ. Du, X.G. Larsén, R. Bolaños-SanchezWind Energy Department, Technical University of Denmark, Risø Campus, Roskilde, Denmark. jitd@dtu.dkPO.ID1811. Warner, J.C., Sherwood, C.R., Signell, R.P., Harris, C., Arango, H.G., 2008b. Development of a three-dimensional, regional, coupled wave, current, and sediment-transport model. Computers and Geosciences, 34, 1284-1306.2. Warner, J.C., Armstrong, B., He, R., and Zambon, J.B., 2010, Development of a Coupled Ocean-Atmosphere-Wave-Sediment Transport (COAWST) modeling system: Ocean Modeling, v. 35, no. 3, p. 230-244.3. Fairall, C. W., E. F. Bradley, J. E. Hare, A. A. Grachev, and J. B. Edson, 2003: Bulk parameterization of air–sea fluxes: Updates and verification for the COARE algorithm. J. Climate, 16, 571– 591. Journal Article, Name of Journal4. Fan, Yalin, et al. "Global ocean surface wave simulation using a coupled atmosphere-wave model." Journal of Climate 25.18 (2012): 6233-6252.5. Janssen, P.A.E.M., 1991: Quasi-linear theory of wind wave gen- eration applied to wave forecasting. J. Phys. Oceanogr., 21, 1631–1642. Validation of modeled wind and wave fields using the nested COAWST system with point measurements as well as QuikScat data suggest the following:1) The modeling system does better for storms of certain strcture than the other (it performs better for storms from the west than for storms from the north).2) The storm wind field favors from the nested, high resolution modeling.3) The system is not sensitive to various roughness length parametrization schemes for the wind speed range from these three storms.4) The modeling is better for the open ocean site than for the coastal site.Further investigation will: 1) use higher resolution tests for the coastal zone2) include more severe storms3) use different large scale atmospheric forcing, such CFSR data4) use very high resolution bathymatry data for the coastal area5) examine heat exchange6) include ocean modelAbstractsModel SeetingsResultsResearch  QuestionConclusions ReferencesEWEA Offshore 2015 – Copenhagen – 10-12 March 2015Roughness Length SchemesThree storm casesU10V10SWANHs,LpTp,z0WRFMCTThe remapping weights between the two models arecalculated by SCRIP—A Spherical CoordinateRemapping and Interpolation Package. The modeldomains and remapping approach is shown in Fig.1.RemappingThree storms were tested. They are:2002/12/22 ~ 2002/12/25, which is an offshore case atHorns Rev. The wind direction mainly from southeast tonorthwest.2003/12/14 ~ 2003/12/16, which is an onshore case atHorns Rev. The wind direction mainly from northwest tosoutheast.2004/03/19 ~ 2004/03/23, which is another on shorecase at Horns Rev. The wind direction mainly fromsouthwest to northeast.One snapshot for each storm is shown by QSCAT windspeed(25 km horizontal resolution) as well as modelresults.relatively shallow water site Horns Rev. The simulationand measurements are shown in Figure 3 and 4 forEkofisk and Horns Rev, respectively. The spatialdistribution of the modeled wind field at 10 m has beencompared with all existing QuikScat data atcorresponding time stamps. Fig 2 shows one snapshotfrom each storm.ResultsFrom the simulations, the statistics of wind speed andwind direction at measurement heights, roughnesslength, the drag coefficient, the significant wave height,the wave period, wave age and wave steepness werecalculated for a number of sites (see Fig.1). Here, thewind speed and direction at measurement height andthe significant wave heights are presented for oneopen ocean, deep water site Ekofisk and one coastal,AcknowledgementThis study is funded mainly by the Danish Forskel project X-WiWa (PSO-12020). The second author acknowledges the EU INNWIND project for the support.

A Coupled Atmospheric and Wave Modeling System for Storm Simulations

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A Coupled Atmospheric and Wave Modeling System for Storm Simulations

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