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Download Advances in Wind Engineering by C. Kramer and H.J. Gerhardt (Eds.) PDF

By C. Kramer and H.J. Gerhardt (Eds.)

Held below the auspices of the overseas organization for Wind Engineering, 226 delegates from twenty-three international locations took half within the convention. This 3 quantity paintings comprises approximately ninety papers released in complete size, including summaries and discussions on different fascinating and invaluable papers offered on the convention

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Structure of mean winds and turbulence in the planetary boundary layer over rural terrain. , Amsterdam — Printed in The Netherlands TURBULENT 51 P R O P E R T I E S AND SPECTRAL BEHAVIOURS OF OCEAN WINDS OBSERVED AT AN OFF-SHORE TOWER G. NAITO Hiratsuka Branch, National Research Center for Disaster Prevention, Hirat>uka, Kanagawa-ken 2 5 4 , Japan ABSTRACT V a r i o u s c h a r a c t e r i s t i c s o f t h e a t m o s p h e r i c t u r b u l e n c e a b o v e t h e open s e a were e s t i m a t e d by a n a l y s i n g t h r e e - d i m e n s i o n a l w i n d f l u c t u a t i o n s , w h i c h were o b s e r v e d a t two l e v e l s o f an o f f - s h o r e t o w e r u n d e r t h e c o n d i t i o n o f l o n g l a s t ­ i n g s t r o n g w i n d s .

85m. I n these r u n s , the s p e c t r a i n h i g h f r e q u e n c i e s d e v i a t e w i t h i n t h e r a n g e between two d o t t e d l i n e s . Run 8 4 1 4 - B was o b s e r v e d i n t h e t y p h o o n . 85m and z 2= 2 3 . 0 m . The smooth c u r v e o f Run 8 4 0 2 f i t t e d t o o b s e r v e d s p e c t r u m i s d e s c r i b e d by nP - 2 2 o 71 n (n) — 5 (7) (1 + 9 3 * ) / 3 u where a = 188 c m / s i s t h e mean v a l u e o f t h e 30 min s t a n d a r d d e v i a t i o n s o f t h e 17 longitudinal wind vector.

30 ten m i n u t e s were p r o v i d e d f o r the i n v e s i g a t i o n a s shown i n T a b l e 1 . 3. (1) / the longitudinal the the (4) y variance of of 2 Ly [ = where L i s2 t h e v a r i aU n c e ov f the u component, and c = 4 . 2 0 6 5 . = v v the (3) equation i s obtained: v Sv(n) 56 / mean 2 wind speed, u following ] x the u component, 2u By 2 1 + (2cn L /U) where U i s the the U uL X = o f the u component may be g i v e n by 2 scale of v component. turbulence of the The a b o v e p r o c e s s e s v component and v hold for the is power s p e c t r u m o f the w component.

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