Geoscience Reference
In-Depth Information
Fig. 1. Temporal variation of height of top of a water pole of Kibedani geyser (obser-
varion) (offered by Maeda lab. at Kanto-Gakuin Univ. (http://home.kanto
∼
gakuin.
ac.jp/
∼
kg044001/yano/sub5.shtml)).
time. At one time, the position is located above the ground. We call the
period a spouting mode. Also at one time, the position is located under
the ground. We call the period a pause mode. These two modes appear
alternately or irregularly in obedience to periodic bubbling springs.
An example of time variation of height of top of a water pole of a
periodic bubbling spring is shown below. Figure 1 shows temporal variations
of height of top of a water pole of Kibedani geyser, which were observed by
Maeda laboratory of Kanto-Gakuin university.
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We can see that height of
top of the water pole goes up and down by turns and a spouting mode and
a pause mode appear alternately and regularly.
3. A Mathematical Model (a Static Model) of a Periodic
Bubbling Spring
A mathematical model (a static model) is derived
8
based on model experi-
ments of a periodic bubbling spring.
1
An ideal figure of model experiments
of a periodic bubbling spring is shown in Fig. 2. When gas is injected suf-
ficiently into a flask, a position of a interface between gas and water in
the flask goes down under one of the lower entrance of a left spouting pipe
and then water packed in the left pipe spouts owing to pressure of gas in
the flask. However, water packed in the left pipe does not spout as soon as
