A Coupled Atmospheric and Wave Modeling System for Storm Simulations

Jianting Du, Xiaoli Guo Larsén, R. Bolanos

    Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

    928 Downloads (Pure)

    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

    Fingerprint

    Dive into the research topics of 'A Coupled Atmospheric and Wave Modeling System for Storm Simulations'. Together they form a unique fingerprint.

    Cite this