ENST 2002 TU Topographic Analysis Coastal & Arid Geomorphology Q&A Lab Discussion This lab needs instructions, because it has a slightly different format. Because people are working on different devices, there is are at least two methods. This lab uses GOOGLE Earth, which is a standalone program, but also a web plugin. Each version has slightly different features.
If you are on a full featured computer, you will need to download Google Earth Pro, and install it, from here: https://www.google.com/earth/versions/#earth-pro (Links to an external site.)
If you are on a chromebook, or tablet, you can access it via the web, but you will need to follow these instructions to load the data into the web interface. Click on the “Projects” button. Once you have downloaded everything for the lab, you can Select open, and pick “Import File from Computer.” This will import the data into the Google Earth webpage. The down arrows allow you to see the layers added, and do things like follow the instructions to click on points. However, the standalone version has more features. Some overlays appear not to work well in the web version.
To find the lab, you will need to go to: https://media.pearsoncmg.com/ph/esm/esm_thomsen_apg_10/cw/ (Links to an external site.)
Scroll Down to lab exercise 26: There are 3 components, an introductory video (helpful), a PDF of the instructions titled, “Exercise 26 PDF,” and the kml file. The kml file is the data you will use in Google Earth to answer the questions in the PDF. Downloading and double clicking on the kml file should open Google Earth, unless you are using the web version
Oh, and at least one of the questions requires you to be through slide 72 in the lectures, where I talk about Ian McHarg and his dune structures.
Pro tip: turn off layers you aren’t using to get rid of artifacts in the display. 3D buildings tend to poke through maps. Name:_____________________________________
Lab Exercise 26
Google Earth Questions
Topographic Analysis: Coastal and Arid Geomorphology
Section 1, Question 10
Point Reyes, CA. Download the Ex26.kmz file from http:/mygeoscienceplace.com and open it in Google Earth.
1. What process formed Tomales Bay?
2. How old can Tomales Bay be, given a plate movement rate of 1.3 cm/yr?
3. Double-click the Goat Rock placemark. What is the name for this coastal feature?
4. After observing the sizes of the beaches to the north and south of Goat Rock, in which direction is the
longshore current transporting sand?
Coastal Geomorphology and Land Use Planning
Island Beach, NJ. After reviewing either Figure 16.17 in Geosystems 9e or Focus Study 12.1 in Elemental
Geosystems 7e, double-click the ISLAND BEACH folder. The coastal environment on the east coast of the
United States has been heavily developed and extensively studied. In his book Design with Nature, Ian
McHarg proposed ecological planning principles to guide development coastal resources. In this Google Earth
exercise you will use historic and current topographic maps, as well as Google Earth imagery, to analyze
physical changes along the New Jersey coast, evaluate past planning decisions and the potential effects of
global climate change. Many thanks to Christopher Marshall for scanning the historical maps and thanks to
MapTech for hosting the files. More historical maps can be found at http://historical.maptech.com/. Note: if your
instructor wishes to concentrate on coastal geomorphology, questions 4, 8, and 9 can be completed without
addressing Ian McHarg’s framework for coastal development.
1. Looking at the placemark at Point A which of McHarg’s environments can you identify?
2. Looking at the placemark at Point B, which of McHarg’s environments can you identify?
3. According to McHarg’s principles, development should be concentrated in the back dune area. Where has
development been concentrated? What political or economic factors would lead to development of sensitive
4. After turning off the topographic map overlays zoom to placemark Point C and observe the pattern of sand
accumulation on the north and south sides of the Barnegat Inlet. What direction do the prevailing waves come
5. Check the box for the BARNEGAT 1884 folder. How much of the north side of the island (from placemark
Point D north to the edge of the topographic map overlay) had been developed by 1884? Divide the area using
a grid and estimate the percent that had been modified or built up.
6. Deselect the BARNEGAT 1884 folder and check the box for the TOM’S RIVER 1948 folder. Approximately
what percent of the north side of the island had been developed by 1948?
7. Deselect the TOM’S RIVER 1948 folder and check the box for the 2007 MAPS folder. Approximately what
percent of the north side of the island had been developed by 2007?
8. Barrier islands often cushion the force of hurricanes, thereby protecting the mainland. What is the maximum
elevation at the placemark at Point B? Point D?
9. If a hurricane similar to Hurricane Katrina passed through this region, the storm surge could easily be 2 m (6
ft). A general coastal development guideline is to not build within 3 m (10 ft) of sea level to prevent flooding and
storm damage. What is the maximum elevation at the placemark at Point A? How much of the area around
Seaside Park would be inundated with 2 m of sea level rise? How about the community of Ocean Gate just to
the west of Point A?
Section 3, Question 10
Cedar Creek, MT. Check and double-click the CEDAR CREEK folder.
1. Double-click the Agriculture placemark and turn the topographic map overlay off and zoom out. What
evidence do you see evidence of agriculture?
What are the diameters of the larger circular features? The smaller circular features?
What is the name for this type of feature? If you are stumped, take a look at Figure 9.2.2 in Geosystems 8e or
Figure 6.2.2 in Elemental Geosystems 7e.
2. What is the name for the coalesced alluvial fans found to the south of the Cedar Creek alluvial fan?
3. Check and double-click the MOSAIC OVERLAY folder. List the names of at least three creeks that form
alluvial fans to the south of Cedar Creek.
Section 4, Question 7
Mitten Buttes, NM. Check and double-click the MITTEN BUTTES folder.
1. What is the relief between West Mitten Butte and the valley floor?
2. Water is the major, although infrequent, erosional force in the desert. Using Google Earth imagery, describe
several examples that demonstrate to you that water is the major erosional force and that it is occurring
infrequently. List at least four examples and their names, if available, or latitude and longitude if they are not
named (look for dry washes, sharp features, alluvial deposits).
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