New PDF release: Air International - Vol 26 No 6

By William Green

Air foreign - Vol 26 No 6 --- Язык: EnglishГод издания: 1984Количество страниц: 30x2Формат: pdf (175 dpi) 2821x1911Размер: 35.6 mb speedy Ifolder zero

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Extra resources for Air International - Vol 26 No 6

Example text

For hurricane-generated seas, the input source of energy which generates random waves is advancing with a certain speed usually in the same direction as the wave energy is progressing. Therefore, the wind speed at a certain location in the ocean in the path of a hurricane increases very fast and the time duration of a given wind speed is much shorter than that observed during an ordinary storm. Nevertheless, the severity of the sea (significant wave height) increases very fast. In particular, the sea state increases rapidly when the hurricane center approaches within a distance of approximately 150 km (95 miles) from the site.

It is not clear at this stage if the difference may be attributed to the difference in sea severities associated with tropical cyclones which have much milder sea severity than hurricanes. Foster (1982) carries out an exhaustive analysis of the parameters involved in the JONSWAP spectral formulation as applied to hurricane-generated seas and derives several important conclusions. One of his most important findings lies in the relationship between the scale parameter a and significant wave height Hs.

We may consider the simple case that the site is on the path of the approaching hurricane. Many studies have been carried out for estimating the magnitude of gradient wind speeds of a hurricane including several empirical formulae developed based on observed data; Graham and Nunn (1959), Kraft (1961), Collins and Viehman (1971), Atkinson and Holliday (1977), and Schwerdt, Ho, and Watkins (1979) among others. The wind field, in general, is estimated based on the pressure gradient and accurate estimation is extremely complicated.

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Air International - Vol 26 No 6 by William Green


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