Physiography of Flowing Water - Freshwater Ecology: Concepts and Environmental Applications - page 86

8

0 m

6

100 m

4

2

0

0 0 0 0 0 0 0 0 090

Time (min)

FIGURE 5.15 Movement of a pulse of chloride through a stream channel with considerable
areas of slack flow (transient storage zones). In a perfect channel, the pulse would be square
as it moves downstream (after Webster and Ehrman, 1996).

5.8 m 3 s -1
25.6 m 3 s -1

10 1

10 0

10 -1 10 0 10 1

Sediment size (mm)

FIGURE 5.16 Movement of particles as a function of particle size for maximum and min-
imum flows in the East Fork River. Note that larger particles move more readily at greater
discharge rates (reprinted by permission of Harvard University Press from Leopold, 1994,
© 1994 by the President and Fellows of Harvard College).