AIDJEX Bulletin #40 - Polar Science Center - University of Washington

The special case when advection can be neglected is considered in a later
sect ion.
In Figure 3 we show graphically the relationship between B (or 8 - n/2)
and K - y. The characteristic direction K appears as the abscissa and yield
curve slope 8 as the ordinate. This implies that, to use the graph, we will
be given K and y and are to find 8.
However, in our analysis it is K that
we seek to determine and that variable depends on 8 and y. The analysis
would dictate that we plot 8 as the abscissa and K as the ordinate. Our
desire to exchange axes is brought about by looking ahead to the use of data
to help evaluate the ice model. In that application we anticipate looking
for a relationship between lead patterns and characteristic directions, and
these are the data that will be given. The results presented in Figure 3
then will help us to determine the shape of the yield curve.
cs
z
I35
I20
IO5
90
75
60
45
c.r
v)
a,
?! I
L
I
I
I
tanP = cos2 I K - y I
\
3U
I \
Fig. 3. Relationship between slope of yield curve B and characteristic
direction K relative to maximum principal stress
direction y.
Several comments must be made about the results given by (51). Similar
comments are relevant for (55). The characteristic direction is given by
130