Abstract
Significant wave height is an important parameter for characterizing ocean surface waves. With the development of remote sensing technology, satellite radar altimetry has become an essential tool for obtaining significant wave height estimations. However, its measurement only covers the satellite track on the ground and cannot be applied to large regions or areas. In this study, we obtained significant wave height from the Hai Yang-2A (HY-2A) radar altimeter and sea surface wind speed at a 10-m height from the HY-2A microwave scatterometer for October 2013, and then proposed a wind-wave relationship model for the South China Sea using linear/nonlinear regression analysis at high/low wind speeds (0–40 m s–1). By comparison with two other wind-wave models and validation with HY-2A observations in November 2013, our results show that the proposed wind-wave relationship model is credible, and at low wind speed exhibited good consistency with the wind-wave model from in situ observations. According to the proposed model, significant wave height from the HY-2A microwave scatterometer-retrieved wind speed and ocean wind wave analysis during the “1329” Typhoon Krosa were successfully obtained and determined. Data coverage of the computed significant wave height was far wider than that of the satellite radar altimeter observations and demonstrated development of typhoon wave fields over a large region. Overall, this study and proposed model provide useful information for the analysis and forecast of typhoon waves and potential storm surge disasters.
Highlights
O CEAN wind waves, which are small-scale surface gravity waves generated by wind, affect the exchange of material, Manuscript received April 23, 2020; revised June 23, 2020; accepted July 1, 2020
Wind waves, are waves that occur on the ocean surface due to the local wind field, whereas swells are a series of waves that propagate from other places [5], [6]
The fitted significant wave height H1/3 was less than 3.95 m, with a standard deviation of 0.58 m, whereas under high wind speeds, the fitted H1/3 was more than 4.06 m, with a standard deviation of 0.76 m
Summary
O CEAN wind waves, which are small-scale surface gravity waves generated by wind, affect the exchange of material, Manuscript received April 23, 2020; revised June 23, 2020; accepted July 1, 2020. Wind waves, are waves that occur on the ocean surface due to the local wind field, whereas swells are a series of waves that propagate from other places [5], [6]. These waves are common and natural phenomena in the ocean; very large ocean wind waves can threaten marine activities, such as navigation, fisheries, marine engineering, and military activities, and can breach and damage sea embankments, harbors, and coastal constructions [7]. It is important for marine scientific research and wave disaster analysis to observe and potentially forecast ocean wind waves effectively
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