Statistical Characteristics of Global Winds and Waves
- Masaru Tsujimoto (National Maritime Research Institute) | Takatoshi Matsuzawa (National Maritime Research Institute) | Kenichi Kume (National Maritime Research Institute)
- Document ID
- International Society of Offshore and Polar Engineers
- The 28th International Ocean and Polar Engineering Conference, 10-15 June, Sapporo, Japan
- Publication Date
- Document Type
- Conference Paper
- 2018. International Society of Offshore and Polar Engineers
- long term prediction, ship response, Weather forecast, North Atlantic Ocean, 3 parameters scatter diagram
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- 15 since 2007
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A long-term database of global weather over 10 years is developed using the nowcast data. Elements of the weather are the significant wave height, the primary peak period of waves, the primary wave direction, the mean wind speed and direction. The sea area is 2.5 degrees spacing in longitude and latitude. It is about 10,000 areas in total. Using the database, the statistical properties of the global weather are investigated. Through the comparison with other databases, it is found the accuracy of the database based on the ship reporting data is considered insufficient at the large wave height.
In designing and operating ships and marine structures, it is necessary to investigate and evaluate weather conditions.
Recording the weather encountered by the ship for long years has been carried out. After that the voluntary observing ship (VOS) reports the weather conditions, and the VOS scheme contributes to understand the ocean weather conditions. Global Wave Statistics (GWS) by Hogben et al. (1986) and BMT (1988) are well known as long-term statistical data of the global ocean weather using the ship reports. Using GWS data, wave scatter table in the North Atlantic Ocean was published by the International Association of Classification Societies (IACS) for load evaluation of ships and offshore structures. The scatter table is based on the table by GWS, but it is made some adjustment by measured value, Bitner-Gregersen et al. (1995).
Besides, many long-term statistics on winds and waves; eg. Roll (1958), Wanden (1964), NOCD (1983), Young&Holland (1996) and Fang et al. (1996) and Caires et al. (2005), have been published so far. In Japan, statistical database on winds and waves of the North Pacific has been published, Yamanouchi et al. (1965), Yamanouchi et al. (1970), Takaishi et al. (1980), Watanabe et al. (1992), Tsujimoto&Ishida(2005).
Its evaluation and application to the prediction of hull load, ship operation etc. are carried out by Bitner-Gregersen&Cramer (1994), Guedes Soares (1995), Shigemi&Zhu (2004), Olsen et al. (2006), Donatini et al. (2015).
|File Size||1 MB||Number of Pages||8|