Spatial averaging of HF radar data for wave measurement applications

Wyatt, Lucy R., Jaffrés, Jasmine B.D., and Heron, Mal L. (2013) Spatial averaging of HF radar data for wave measurement applications. Journal of Atmospheric and Oceanic Technology, 30 (9). pp. 2216-2224.

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Abstract

HF radar data are often collected for time periods that are optimized for current measurement applications where, in many cases, very high temporal resolution is needed. Previous work has demonstrated that this does not provide sufficient averaging for robust wave measurements to be made. It was shown that improvements could be made by averaging the radar data for longer time periods. HF radar provides measurements over space as well as in time, so there is also the possibility to average in space. However, the radar data are correlated in space because of the range and azimuth processing. The implications of this are discussed and estimates of the impact on the reduction in variance in the radar Doppler spectral estimates are obtained. Spatial inhomogeneities and temporal nonstationarity in the ocean wave field itself also need to be taken into account. It is suggested that temporal averaging over periods of up to one hour and spatial averaging over 9–25 nearest neighbors may be suitable, and these will be explored in later work.

Item ID: 30185
Item Type: Article (Research - C1)
ISSN: 1520-0426
Keywords: radars, radar observations, remote sensing, sampling, spectral analysis, models, distribution, statistics
Funders: Australian Research Council (ARC), Seaview Sensing, UK, Helzel Messtechnik GmbH, Germany
Date Deposited: 13 Nov 2013 05:40
FoR Codes: 04 EARTH SCIENCES > 0405 Oceanography > 040503 Physical Oceanography @ 40%
09 ENGINEERING > 0911 Maritime Engineering > 091103 Ocean Engineering @ 60%
SEO Codes: 96 ENVIRONMENT > 9611 Physical and Chemical Conditions of Water > 961102 Physical and Chemical Conditions of Water in Coastal and Estuarine Environments @ 20%
96 ENVIRONMENT > 9611 Physical and Chemical Conditions of Water > 961104 Physical and Chemical Conditions of Water in Marine Environments @ 30%
97 EXPANDING KNOWLEDGE > 970102 Expanding Knowledge in the Physical Sciences @ 50%
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