Download e-book for iPad: Air Pollution by R. S. Scorer and R. S. Scorer (Auth.)

By R. S. Scorer and R. S. Scorer (Auth.)

ISBN-10: 0080133452

ISBN-13: 9780080133454

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Example text

Edinburgh seen from SaHsbury Craggs. T h e houses burn­ ing coal create an area source of smoke 40 AIR POLLUTION a t w o - d i m e n s i o n a l p a r a b o l i c f o r m o f d i l u t i o n is most a p p r o p r i a t e so that the cross-section area o f the p l u m e a n d therefore also the c o n c e n t r a t i o n , is p r o p o r t i o n a l t o R~ ^, i . e . t o x~K AREA SOURCES A t g r e a t distances w e are n o t r e a l l y c o n c e r n e d w i t h the p o l l u ­ tion f r o m a single source, because it is a l r e a d y t o o dilute, but w i t h p o l l u t i o n f r o m industrial areas, housing estates, o r e v e n t o w n s a n d conurbations.

T h e vertical co-ordinate is P, the pollution concentration and the horizontal one is R , distance from the centre. T h e formula corresponding to each curve is given in the key. Only the first shape is shown on both sides of the axis. T h e others are shown on one side only a p a r a b o l i c shape because w e a r e a l l o w i n g the '^changes i n w i n d d i r e c t i o n " close t o the source t o increase the diffusion t h e r e . B u t as w e g o still further a w a y f r o m the source w e shall find t h a t t h e p a r a b o l i c o u t l i n e has b e c o m e c o n t o r t e d b y t h e l a r g e r e d d i e s a n d is snaking a r o u n d w i t h i n the c o n e .

T h e smoke does not travel along a sinuous track but the sinuosities travel along with the wind growing in size as they go T h e c o n d i t i o n s illustrated in these three pictures a r e so different f r o m o n e a n o t h e r a n d f r o m the situations s h o w n i n Plates 2 . 4 , 4 . 9, that w e must either abandon the relationship (5) a l t o g e t h e r , o r say that the constant o f p r o p o r t i o n a l i t y is different in different cases, o r t h a t the p o l l u t i o n referred t o is o n l y s o m e sort o f l o n g - t e r m a v e r a g e a n d that U is a n a v e r a g e w i n d speed.

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Air Pollution by R. S. Scorer and R. S. Scorer (Auth.)


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