A Coupled Atmospheric and Wave Modeling System for Storm Simulations

Jianting Du, Xiaoli Guo Larsén, R. Bolanos

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Abstract

This study aims at improving the simulation of wind and waves during storms in connection with wind turbine design and operations in coastal areas. For this particular purpose, we investigated the Coupled-Ocean-Atmosphere-Wave-Sediment Transport (COAWST) Modeling System which couples the Weather Research and Forecasting (WRF) Model with the thirdgeneration ocean wave modelSWAN. This study investigates mainly two issues: spatial resolution and the wind-wave interface parameter roughness length(z0). To study the impact of resolution, the nesting function for both WRF and SWAN is used, with spatial resolution ranging from 25km to 2km. Meanwhile, the atmospheric forcing data of dierent spatial resolution, with one about 100km (FNL) and the other about 38km (CFSR) are both used. In addition, bathymatry data of diferent resolutions (1arc-minute and 30arc-seconds) are used. We used three approaches to parametrize z0. The results are validated through QuikScat data and point measurements from an open ocean site Ekosk and a coastal, relatively shallow water site Horns Rev. It is found that the modeling system captures in general better strong wind and strong wave characteristics for open ocean condition than for the coastal condition. With the current model setup, using high spatial resolution gives better results for strong winds both for the open ocean and coastal sites. The signicant wave height (Hm0) is very sensitive to the model resolution and bathymetry data for the coastal zone. In addition, using Janssen (1991) z0 expression gives better results of the signicant wave hight under high sea state conditions.
Original languageEnglish
Title of host publicationProceedings of EWEA Offshore 2015 Conference
Number of pages9
PublisherEuropean Wind Energy Association (EWEA)
Publication date2015
Publication statusPublished - 2015
EventEWEA Offshore 2015 Conference - Bella Center, Copenhagen, Denmark
Duration: 10 Mar 201512 Mar 2015

Conference

ConferenceEWEA Offshore 2015 Conference
LocationBella Center
Country/TerritoryDenmark
CityCopenhagen
Period10/03/201512/03/2015

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