Lab_6 Streams and Floods (1)
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South Texas College *
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Course
1403
Subject
Geology
Date
Jan 9, 2024
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4
Uploaded by GeneralArmadillo929
1
Physical Geology (GEOL -1403)
Stream and Flood (Lab 6 Material)
Name:
Section:
Date:
Part: I
Answer the following questions based on the map provided. (2.5 points)
1.
What is the highest elevation (in feet)? _______________________________
2.
Which city is the lowest elevation (Rockville, Norton or Dixon)? Why?
3.
Which mountain or hill contains the steepest relief on the topographic map (Bear Mountain,
White Mountain, Summit Hill or Bald Peak)? Why?
4.
Which mountain or hill contains the gentlest relief in the topographic map (Bear Mountain,
White Mountain, Summit Hill or Bald Peak)? Why?
5.
Which stream (Roaring Stream, Rapid Brook, Fish Creek or Dark River) originates at the
highest elevation?
What is that elevation?____
590 ft
Norton is the city with the lowest elevation because it is lower than 100 feet.
Bear Mountain contains the steepest relief because the contours are so close together compared to the rest.
Bald Peak contains the gentlest relief because the contours are very spaced out.
Roaring Stream and Rapid Brook both have similar elevations, but Rapid Brook takes the lead by a very
small amount
200-300
Kayla Vazquez
SV2
12/7/23
2
3
Part: II
Step 1:
Read lab manual chapter 11 “Stream Processes, Geomorphology and Hazards” from
page 293 to
Page 306.
Activity 11.2: Introduction to stream Processes and Landscapes
A.
Lab manual
page 309 figure A11.2.1
.
1.
Complete parts
a
through
h
in
Fig. A11.2.1.
(3.5 points)
A.
Contour interval is:
B.
The elevation of point x is:
C.
The elevation of Point B is:
D.
The elevation of Point A is:
E.
The distance from A to B is:
F.
The Gradient from A to B is:
G.
Trout Run flows (drains downhill) in what direction?
2.
Imagine that heavy rain fell on a saturated landscape at location
X
in
Fig. A11.21
. Is it likely that
runoff water would flow from
X
downhill into Trout Run? Explain your reasoning.
(2 point)
B.
Page 310. Figure A11.2.2
(solve questions
1, 2, ,3, 5, 6 and 7
) Provide the proper unit. No points
will be given for values without units (eg.
Ft,
cm, m )
(5 points)
1.
2.
3.
5.
6.
240ft
100ft
180ft
1 mile
80ft/mi
downstream/north
I believe that water from point X would flow down into Trout Run. The reason is because Trout Run is flowing
downstream and the high elevation from point x would make it go to a lower elevation, where Trout Run is
located.
30ft/1.45km = 20.7ft/km
Dendritic drainage patterns
30ft/.621mi = 48.3ft/mi
gradient
-
20ft/1.27km = 15.75ft/km
20ft/.79mi = 25.32ft/mi
sinuosity - 0.5
When the stream order increases, it causes an decrease in the gradient.
2.0ft/mi
0.85
1st stream order
7.
When the stream order increases, it causes an increase in the stream's discharge
20ft
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4
Activity 11.5: Meander Evolution on the Rio Grande: (13 points)
Read Figure A.5.1 carefully and solve the questions (A, B, C, D, E and F) in page.318.
A.
(2 points)
B.
(3 points)
C.
(1 points)
D.
(1 points)
E.
(3 points)
F.
(3 points)
1. H and I were located in Mexico
2. H and I are located in the USA
3. The river meandered and caused the curves to become more sinuous. The river
branches intersected and caused the river to change course.
The river branches might intersect and cause the river to change its course, causing K and J to
become part of the USA.
L, M, and N are oxbow lakes. They indicate that the Rio Grande had many oxbow curves, but as time
went on the river found a shorter path.
The average movement for the entities denoted A through G is recorded at 520 meters. This
displacement normalizes to an average of 9.2857 meters per year.
The rivers start by eroding vertically, but as they reach flatter areas, they begin to erode sideways.
This creates curves and causes erosion on the outer banks and deposition on the inner banks. The
river creates oxbow lakes as time goes by due to it cutting through one of these bends.
The general directions that the cutbanks have moved are leftward and lower.