The impact of urban groundwater upon surface water - eTheses ...

Apparent specific yield
0.50
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0.00
Variation in apparent specific yield with variations in a forcing head sin
function (wavelength 2 days, amplitude 50 cm) at the base of the column.
0 1 2 3 4 5 6 7 8 9 10
Time (days)
Sand
Clay
Loam
Forcing Head
Figure 6.24 Variation in the UNSAT model apparent specific yield with changes in the
forcing head
Global apparent specific yield
0.3
0.25
0.2
0.15
0.1
0.05
Variations in Global Apparent Specific Yield with changes to the amplitude
and wavelength (WL) of the forcing head Sin function at the base of a sand
column
Wavelength 0.25 day
Wavelength 1 day
Clay WL 2 days
Sand WL 2 days
Loam WL 2 days
0
0 10 20 30 40 50
Amplitude (cm)
60 70 80 90 100
Figure 6.25 Variations in global specific yield with changes in the amplitude and wavelength
of the forcing head
30
20
10
0
-10
-20
-30
Forcing Head (cm)