Geoscience Reference
In-Depth Information
Q
(m
3
s
−
1
)
b
=1
b
=3
Q
(cfs)
Fig. 10.33 Same as Figure 10.31, but for the period 1966-1977 on Salt Creek in Oklahoma. The drainage area of
this basin is
A
62 km
2
, the total length of all stream channels is
L
=
=
76 km, and the estimated mean
depth of the surface aquifers is
D
=
1.4 m. (From Brutsaert and Lopez, 1998.)
a
−
3
can be considered as a characteristic time scale for base flow drainage of
a basin, from which also the storage half-life can be derived, as
Thus,
−
a
3
. It is also
related to the hydraulic diffusivity defined in Equation (10.89). Comparison between
(10.165) and (10.89) with (10.93) produces immediately
−
ln(2)
/
a
3
π
−
2
(
A
L
)
2
D
h
=−
/
(10.172)
In a similar way, the value of
a
1
for the short-time envelope can be related to the hydraulic
desorptivity defined in Equation (10.59). In this case, comparison between (10.161) and
(10.61) with (10.63) shows that
(2
a
1
L
)
−
1
/
2
De
h
=
(10.173)
Equations (10.165) (or (10.163)) and (10.161) can also be combined to determine the
effective aquifer parameters from
a
3
(or
a
2
) and
a
1
. However, because there are three
