By Miloš Holý, Asit K. Biswas and Margaret R. Biswas (Auth.)
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Extra resources for Erosion and Environment. Environmental Sciences and Applications
This curve will be obtained by determining the highest values cf runoff in the elementary runoff curve for the selected time intervals and by plotting these values as ordinates in dependence on time. 47). Ί0 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 — * " time [min] Fig. 47. Line of theoretical elementary runoffs. 22) T + B where q is the specific runoff (1 s ha"·1) T is the rainfall duration (mins) A,B are coefficients in values 2 2 A = -(q T)(q) + (qT)(q ) k(q2) - (q)(q) Mechanism of Erosion Processes _ = -k(g2T) - (qT)(q) k(qO - (q)(q) 61 k i s the number of i n v e s t i g a t e d r a i n f a l l s ( ) i s the sign for the sum.
27). Bed erosion is a form of longitudinal erosion proceeding along the longitudinal axis of the water flow while bank erosion is a form of transversal erosion proceeding normally to the flow axis. Stream erosion is most evident in torrents which usually carry large amounts of sediments. Classification of Erosion 27 Fig. 21b. Field affected by rill erosion (photo by M. 2 Subsurface Water Erosion This term is sometimes used to describe the transport of soil particles and nutrients from the surface to the lower soil layers with infiltrating precipitation.
26b. Stream bank erosion. C l a s s i f i c a t i o n of Erosion f*M Ί % Fig. 27. Stream bank erosion (photo by J. Riha), 35 36 Erosion and Environment F i g . 28. Rock formation in Bohemian Central Mountain Range (photo by J . R i h a ) . Classification of Erosion Fig. 29. Rock formation near Prague (photo by J. Riha). 37 3. Mechanism of Erosion Processes Erosion i s a process i n i t i a t e d by n a t u r a l f i c a n t namely in the of n a t u r a l resources which i s c o n t i n u a l l y transforming the E a r t h ' s s u r f a c e .