碩士 / 國立臺灣海洋大學 / 海洋環境資訊學系 / 101 / The rapid growth wave (RGW) is a kind of dangerous wave in the ocean. It impacts to ship navigation especially for small boats. Previous studies have been worked on the understanding of the statistical properties of RGW. The purpose of this study is to study the causes of RGW and their correlations in order to establish the prediction model in the future.
By analyzing the data from Hsinchu Buoy, it is understood that front is the main weather condition when RGW occurs. From buoy data, it is known the max. mean wind speed is between 10 to 15 m/s (Beaufort Scale 5 to 7) and the gust wind speed is from Beaufort Scale 5 to 8 when a front passage. The mean wind speed increment is 6 to 8 m/s during a front and the moving speed of a front is about 30 to 40 km/hr which is twice of typhoon moving speed. This study picks up 27 typical front-triggered RGW cases. By multi-variable regression analysis, it is found the increasing significant wave height (ΔH) and the rate of the increasing (Hrate) are correlated with front moving speed (VF), wind speed increment (Δū) and duration of the event (∆t). The calibration of the regression models are shown below. Validation from independent cases shows the correlation coefficients are 0.77 for ΔH estimation and 0.79 for Hrate estimation respectively.
∆H=0.1421+0.0093V_F+0.0942Δū+0.1213∆t
H_rate=0.4467-0.0002V_F+0.0293Δū-0.0498∆t
The quantity and rate of the increasing significant wave height of a RGW can be estimated in the future when there are information of front moving speed, wind speed increment and influence duration.
| Identifer | oai:union.ndltd.org:TW/101NTOU5276028 |
| Date | January 2013 |
| Creators | Shih-An Shen, 沈時安 |
| Contributors | Dong-Jiing Doong, 董東璟 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 54 |
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