Geoscience Reference
In-Depth Information
10
Figure 26.2 A (simulated) chart
of precipitation for a storm
measured using a siphon rain
gauge. Note that once the
chamber reaches a storage that is
equivalent to 10 mm of rainfall,
the chamber is siphoned empty
and then continues to refill as the
storm proceeds.
8
6
4
2
0
0
20
40
60
Time (minutes)
80
100
120
Table 26.2
Digitized form of a chart measured using a siphon rain gauge illustrated in
Figure 12.2 and used in question 7(d).
Time
(minutes)
Gauge
reading (mm)
Time
(minutes)
Gauge
reading (mm)
Time
(minutes)
Gauge
reading (mm)
0.00
2.62
31.40
10.00
60.00
7.49
5.00
5.25
31.40
0.00
65.00
9.27
10.00
7.76
35.00
9.48
68.69
10.00
11.85
10.00
35.19
10.00
68.69
0.00
11.85
0.00
35.19
0.00
70.00
0.26
15.00
3.82
39.02
10.00
75.00
1.21
18.38
10.00
39.02
0.00
80.00
1.82
18.38
0.00
40.00
2.50
85.00
2.55
20.00
2.97
43.14
10.00
90.00
2.68
23.45
10.00
43.14
0.00
95.00
3.32
23.45
0.00
45.00
4.02
100.00
3.86
25.00
3.16
48.70
10.00
105.00
4.83
27.60
10.00
48.70
0.00
110.00
5.96
27.60
0.00
50.00
2.11
115.00
6.29
30.00
6.30
55.00
4.52
120.00
6.72
(d) During a storm the chart from a siphon rain gauge produced the (simu-
lated) form illustrated in Fig. 26.2. This was digitized to give the numerical
time sequence in Table 26.2. Plot the mass curve for this particular storm
and, on the basis of this mass curve, speculate as to whether the chart was
most likely to be for a frontal or convective storm and explain your
reasoning.
(e) The July rainfall amounts in Tanzania over the period 1931-1960 are given
in Table 13.1. Calculate the mean value and estimate the median value of
the July rainfall in Tanzania between 1931 and 1960. If you find they differ,
say why.
 
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