Data assimilation of partitioned HF radar wave data into Wavewatch III

Waters, Jennifer, Wyatt, Lucy R., Wolf, Judith, Hines, Adrian, and UNSPECIFIED (2013) Data assimilation of partitioned HF radar wave data into Wavewatch III. Ocean Modelling, 72. pp. 17-31.

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Abstract

In this study the assimilation of HF radar data into a high resolution, coastal Wavewatch III model is investigated. An optimal interpolation scheme is used to assimilate the data and the design of a background error covariance matrix which reflects the local conditions and difficulties associated with a coastal domain is discussed. Two assimilation schemes are trialled; a scheme which assimilates mean parameters from the HF radar data and a scheme which assimilates partitioned spectral HF radar data. This study demonstrates the feasibility of assimilating partitioned wave data into a coastal domain. The results show that the assimilation schemes provide satisfactory improvements to significant wave heights but more mixed results for mean periods. The best improvements are seen during a stormy period with turning winds. During this period the model is deficient at capturing the change in wave directions and the peak in the waveheights, while the high sea state ensures good quality HF radar data for assimilation. The study also suggests that there are both physical and practical advantages to assimilating partitioned wave data compared to assimilating mean parameters for the whole spectrum.

Item ID: 31651
Item Type: Article (Research - C1)
ISSN: 1463-5011
Keywords: data assimilation, high frequency radar, wave spectrum, wave modelling
Funders: Natural Environment Research Council (UK), Met Office
Projects and Grants: NE/E529041/1
Date Deposited: 26 Feb 2014 09:55
FoR Codes: 04 EARTH SCIENCES > 0405 Oceanography > 040503 Physical Oceanography @ 50%
09 ENGINEERING > 0911 Maritime Engineering > 091103 Ocean Engineering @ 50%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970102 Expanding Knowledge in the Physical Sciences @ 50%
96 ENVIRONMENT > 9610 Natural Hazards > 961006 Natural Hazards in Marine Environments @ 20%
96 ENVIRONMENT > 9611 Physical and Chemical Conditions of Water > 961104 Physical and Chemical Conditions of Water in Marine Environments @ 30%
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