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Pewwson
Eduostion,
lee.
Figure
A12.4.1
Part
D.
On
your
profile,
label
the
modern
floodplain
of
the
Souris
River
and
record
its
width
along
line
X-Y.
Part
E.
What
was
the
maximum
width
of
the
Souris
River
floodplain
in
the
past
(measured
along
line
X-Y),
and
how
can
you
tell?
Part
F.
Give
one
possible
reason
why
the
Souris
River
floodplain
was
wider
in
the
past.
Part
G.
Reflect
&
Discuss.
Notice
along
line
X-Y
that
the
terrace
on
the
south
side
of
the
Souris
River
is
30-40
feet
higher
than
the
terrace
on
the
north
side
of
the
river.
Suggest
how
these
two
different
levels
of
terraces
may
have
formed
and
which
one
is
older
based
on
your
hypothesis.
Activity
12.5
Meander
Evolution
on
the
Rio
Grande
|
The
Rio
Grande
River
forms
part
of
the
national
border
between
Mexico
and
the
United
States
(Fig.
A12.5.1).
Notice
that
the
position
of
the
river
changed
in
many
places
between
1936
(red
line
and
leaders
by
lettered
features)
and
1992
(blue
water
bodies
and
leaders
by
lettered
features).
Study
the
meander
terms
provided
in
Figs.
12.13
and
A12.5.1,
and
then
proceed
to
the
following
questions.
Part
A.
Study
the
meander
cutbanks
labeled
A
through
G.
The
red
leader
from
each
letter
points
to
the
cutbank’s
location
in
1936.
The
blue
leader
from
each
letter
points
to
the
cutbank’s
location
in
1992.
In
what
two
general
directions
(relative
to
the
meander,
relative
to
the
direction
of
river
flow)
have
these
cutbanks
moved?
