GEL 1008: Lab 11 help

GEL 1008
PHYSICAL GEOLOGY

Physical Geology Helpful Lab Hints

Exercise 11: Sea Coasts

Problem 1 (b, d, g)

Identify the features on the aerial image (Fig 11.9) using the descriptions on p. 207-209 and Figure 11.5 (p. 210)
Identify the features labeled with an "X" on Figure 11.12. (Hint: The feature is labeled on Fig 11.5 and discussed on p. 209.)
This problem comares the maps and aerial images on p. 215-217 and includes questions on p. 214 & 218.
1. How does the shape of the spit relate to the direction of longshore drift? (see figures 11.4 & 11.5 and Textbook Section 14.14, part B)
2. Complete the table using the maps and aerial images.
  - Distances can be measured by using a known map distance for scale
    - (measured distance on map) cm / (known distance on map) m = (scale conversion factor) cm/m
    - (measured distance on map) cm X (scale conversion factor) cm/m = (actual distance) m
  - 1952 & 1971: use Figure 11.8 (map); measure the distances indicated on this image
  - 1982: use Figure 11.10; measure the distance indicated on this image
  - Calulate the difference from the previous air photo by subtracting the older distance from the younger distance listred in the first column of the table.
  - Calulate the rate by dividing the difference from the previous air photo by the number of years between photos
3. The direction the inlet moved is indicated by the rate: a postive # means the inlet moved east while a negative number means the inlet moved west.
4. Compare the rates on the table to the average erosion rate (1.4 m/yr), are they similar or different?

Problem 2

"Landform" refers to the name a geologist would give the features. These names are described on pages 207-209 and used to label figures 11.3, 11.4, & 11.5
Use the figures and descriptions in the lab book to determine what these features would look like. Use the key to topographic maps (p. 104) to identify how those features would be depicted on the map.
Use this image to help find some of the features referred to in parts a, b, c