Environmental Engineering Reference
In-Depth Information
With the following commands heads in confined and unconfined aquifers are
compared:
plot (x,hc,'-b',x,hu,'--g');
legend ('confined','unconfined',2)
Exercise 13.1. Change
q
to a more realistic value that is 2 orders of magnitude
lower
Quite often the discharge
q
is not known. Instead, the groundwater level
h
1
in
a certain distance
L
is known from measurements. The derivation of the solution,
as shown above, delivers the formulae:
8
<
h
1
h
0
L
h
0
þ
x
for the confined aquifer
r
h
0
þ
hðxÞ¼
(13.13)
h
1
h
0
L
:
x
for the unconfined aquifer
Obviously,
h
depends only on the observed values
h
0
and
h
1
and the length
L
.
h
is
independent of the material parameter
K
and the aquifer depth
H
.
Exercise 13.2. Compare the confined and the unconfined situation in a graph, as it
is shown in Fig.
13.1
!
The solution is obtained by using the following commands:
15
confined
unconfined
14.5
14
13.5
13
12.5
12
11.5
11
10.5
10
0
10
20
30
40
50
60
70
80
90
100
Fig. 13.1 Piezometric head for a confined and an unconfined aquifer with identical hydraulic
properties
