Graduate Thesis Or Dissertation

 

Weather and large waves along the Oregon coast: atmospheric controls on a numerical wave model Public Deposited

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/mw22vb36n

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  • In this study, the effects of implementing different wind input or physics packages in a numerical wave model to recreate large wave conditions are explored. Three large wave events are simulated with WaveWatch III. The wind inputs which are compared are NCEP's Global Forecasting System (GFS) with 0.5 degree resolution and Climate Forecast System Reanalysis (CFSR) with 0.312 degree resolution, and the physics packages which are compared are ST2 (Tolman and Chalikov, 1996) and ST4 (Ardhuin et al, 2010). The modelled output, including spectral shape and bulk parameter time series, are compared with National Data Buoy Center buoy observations offshore of Newport, OR. The atmospheric conditions which generate these large waves include a wind feature called a coastal jet along with a distant cyclone. The energetic contribution of these simultaneously occurring atmospheric features results in a wave field characterized by bi-modal energy spectra for two events and uni-modal energy spectra for the third event. The analysis of model output includes evaluates bulk parameter time series significant wave height, mean period and mean wave direction derived from partitioned energy spectra. A consistent underestimation in wave energy emanating from the southwestern direction is found for the output associated with all model configurations. This wave energy is generated by the coastal jet. An overestimation in swell energy emanating from the northwest is also found for all model configurations. The model configuration which features the combination of CFSR winds with Ardhuin et al (2010) physics results in the best performance for the largest wave heights, with a reduction in error for overall bulk parameters as well as partitioned bulk parameters.
  • Keywords: numerical wave model, large waves, waves
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  • description.provenance : Rejected by Julie Kurtz(julie.kurtz@oregonstate.edu), reason: Hi Ashley,Rejecting because none of the revisions were made to the pretext pages. Changes required are -1) Abstract page – change Coastal and Ocean Engineering to – Civil Engineering since we do not have a Coastal and Ocean Engineering major.2) Title page – change the commencement date to read – Commencement June 2018 even if you attended the 2017 ceremony3) Approval page – change first signature line to read – Major Professor, representing Civil Engineering. The second signature line change to read – Head of the School of Civil and Construction Engineering Everything else looks good. Once revised, log back into ScholarsArchive and go to the upload page. Replace the attached file with the revised PDF and resubmit.Thanks,Julie on 2017-09-28T20:35:03Z (GMT)
  • description.provenance : Approved for entry into archive by Margaret Mellinger(margaret.mellinger@oregonstate.edu) on 2017-10-17T00:04:13Z (GMT) No. of bitstreams: 1EllensonAshleyN2017.pdf: 4536364 bytes, checksum: 47d9794508311674cf6d78ef8c71a89c (MD5)
  • description.provenance : Approved for entry into archive by Julie Kurtz(julie.kurtz@oregonstate.edu) on 2017-09-29T19:02:41Z (GMT) No. of bitstreams: 1EllensonAshleyN2017.pdf: 4536364 bytes, checksum: 47d9794508311674cf6d78ef8c71a89c (MD5)
  • description.provenance : Submitted by Ashley Ellenson (ellensoa@oregonstate.edu) on 2017-09-28T22:05:08ZNo. of bitstreams: 1EllensonAshleyN2017.pdf: 4536364 bytes, checksum: 47d9794508311674cf6d78ef8c71a89c (MD5)
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  • description.provenance : Submitted by Ashley Ellenson (ellensoa@oregonstate.edu) on 2017-09-28T19:20:53ZNo. of bitstreams: 1EllensonAshleyN2017.pdf: 4536418 bytes, checksum: 7e1bb7902af4bce87869a8f2bf1016b1 (MD5)

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