Geoscience Reference
In-Depth Information
P
3
(2.5, 5.0)
Field
4
+
+
+
+
+
+
+
+
+
+
+
+
P
2
2
(7.0, 2.5)
+
+
+
+
+
+
+
+
+
+
+
+
Figure 26.3
The field for which
area-average precipitation is to
be calculated, and the three rain
gauge positions P1, P2, and P3 at
which the gauges are located
from which calculations are to be
made in question 7(i).
−
2
2
4
6
8
(Distance in km)
P
1
2
−
(
−
1.0,
−
1.5)
(f ) Compute and plot the time variations in the 7-year running mean for July
Tanzanian rainfall data between 1934 and 1957.
(g) Compute and plot the mass curve for July Tanzanian rainfall data between
1931 and 1960.
(h) Compute and plot the cumulative deviation for July Tanzanian rainfall data
between 1931 and 1960.
(i) A farmer owns the field illustrated in Fig. 26.3 which is 6 km by 4 km. He
has access to the data from three rain gauges which are located at P
1
, P
2
, and
P
3
in this diagram. In April these three gauges measure 16, 8, and 7 mm of
rainfall, respectively, in May they measure 26, 34, and 43 mm of rainfall,
respectively, and in June they measure 51, 44, and 37 mm of rainfall,
respectively. He decides to estimate the area-average rainfall for his field by
using the Reciprocal-Distance-Squared to estimate rainfall estimates at the
center of each square kilometer of his field (i.e., at the points shown), and
then averaging these values. What were the area-average precipitation
values he calculated for April, May, and June?
Question 8
(Uses understanding and equations
from Chapters 16, 17, and 18.)
(a) Starting from Equation (16.46), i.e., the basic equation for conservation of
water vapor in the atmosphere, by analogy with the derivation given in
Chapter 17 for vertical velocity in your class notes or otherwise, derive
