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Erosion and Environment. Environmental Sciences and by Miloš Holý, Asit K. Biswas and Margaret R. Biswas (Auth.)

By Miloš Holý, Asit K. Biswas and Margaret R. Biswas (Auth.)

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The s a i d parameter of e r o s i v i t y was d e s c r i b e d as the E I 3 0 Index. I t can be computed for i n d i v i d u a l r a i n f a l l s and the values can be summed up over p e r i o d s of time to give d a i l y , weekly, monthly, annual or n - y e a r values of the parameter. For i t s computation W. H. 7 mm. The El30 Index which has been proven in the US can be a p p l i e d in o t h e r conditions only with c e r t a i n m o d i f i c a t i o n s . For c o n d i t i o n s p r e v a i l i n g in A f r i c a , N.

Hauser. I t i s e x t r e m e l y d i f f i c u l t t o d e s c r i b e r a i n d r o p d i s t r i b u t i o n by a s i n g l e p a r a m e t e r . N . Hudson(32) s t a t e s t h a t p r o b a b l y t h e b e s t i n d e x f o r drop d i s t r i b u t i o n i s t h e median volume drop d i a m e t e r D 5 0 which i s s u c h t h a t h a l f o f t h e volume o f t h e r a i n f a l l s i n d r o p s w i t h a smaller d i a m e t e r and t h e o t h e r h a l f as b i g g e r d r o p s . The i n d e x i s o b t a i n e d from a p l o t o f c u m u l a t i v e v o l u m a g a i n s t d r o p ~ d i a m e t e r( F i g .

1 m 3 ha _ 1 . R. M. Smith and W. L. S t a r n e y ( 8 ) s t u d i e d the i n t e n s i t y of the e r o s i o n process on experimental p l o t s with v i r g i n s o i l s p r o t e c t e d by v e g e t a t i v e cover. Measurements which they conducted in d i f f e r e n t p a r t s of the USA showed t h a t normal erosion was within the region of 0 . 2 5 - 1 . 4 8 t ha" 1 p e r year which corresponds to n a t u r a l s o i l formation. EE - B* 32 E r o s i o n and E n v i r o n m e n t F i g .

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