Geography Reference
In-Depth Information
Figure 7.7. (a) Response of FDCs to
conversion of native forest to pasture
in the Wights catchment in south-
west Western Australia. (b) Flow
duration curves for the Red Hill
catchment, near Tumut, New South
Wales, Australia, showing
considerable difference between
one-year-old pines and eight-year-
old pines. After Vertessy ( 2000 ) and
Brown et al.( 2005 ).
10
a)
1989-1991
1
1986-1988
1983-1985
1992-1994
(pasture)
0.1
1980-1982
0.01
1977-1979
1974-1976
(native forest)
0.001
10
b)
1
1 year after planting
0.1
0.01
8 years after planting
0.001
0
10
20
30
40
50
60
70
80
90
100
Percent of time exceeded
Figure 7.8. Slope of the FDC for the eastern USA using the data of Sawicz et al.( 2011 ): (a) catchment average values; (b) linear interpolation
between USGS gauging stations. In both cases, the colour is representative of the magnitude of the slope of the FDC.
Cheng et al.( 2012 ) carried out a comparative analysis of
the FDCs for 197 catchments across the USA following the
approach presented in Yokoo and Sivapalan ( 2011 ). They
constructed FDCs for precipitation, fast (surface) runoff,
slow (subsurface) runoff and total runoff, which they termed
in this order PDC, FFDC, SFDC and TFDC and fitted a
three-parameter truncated gamma distribution to each of
these duration curves. For example, they fitted a three-
 
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