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.