Lab 7A
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University of Houston Downtown *
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Course
1304
Subject
Geography
Date
Dec 6, 2023
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docx
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2
Uploaded by ChiefHerringPerson172
1.The orthogonal drawn on Figure 7A-1 ______:
Curves toward the shore.
2. The right panel of Figure 7A-1 shows wave crests approaching shore from a different oblique
angle. Draw the orthogonal on the wave crest in the right panel. This orthogonal ______:
Curves toward the shore.
3. In Figure 7A-1, waves arrive nearly perpendicular to the shore for both panels. The water
drains back to the ocean perpendicular to the beach under the pull of gravity. Sediment picked up
in the water follows a zig-zag motion along the beach, resulting in a longshore current, which
transports sediments as littoral drift along the coast. The longshore current in the left panel flows
from ______. Draw arrows in both panels representing the direction of their respective longshore
currents:
Left to right.
4. Given the direction of littoral drift, what do you expect would happen to the beach in the left
panel if there was a jetty on the far right side?:
It would continue to travel straight.
5. Click on Figure 7A-2 to open it in a new tab then complete the drawing of the orthogonal to
shore. The orthogonal of wave crests approaching a headland refract ______ the headland,
thereby concentrating wave energy:
Toward.
6. ______ orthogonal indicate the concentration of wave energy:
Converging.
7. In Figure 7A-2, sediment is eroded from the ______ and deposited in the ______:
Headland...bay.
8. Which factor affects the size and shape of the barrier island?:
Ocean Waves.
9. Based on differences in width of the barrier island beach on either side of the tidal inlets, and
knowing beach sediments accumulate down current of the longshore current, the prevailing
direction of littoral drift is from ______. (North is at the top of the image.):
Southwest to Northeast.
10. From Figure 7A-3, beaches are generally ______ along the northern coast of the Isle of
Jersey, which faces the English Channel:
Absent.
11. Along the southern and western coasts, beaches are ______ along the broad concave
embayments and generally absent along headlands:
Extensive.
12. Using these observations, wave energy ______ sediment along the headlands and
______sediment in the embayments:
Erodes...Deposits.
13. In Figure 7A-4 the darker color indicates greater wave height. Near the earthquake epicenter,
maximum wave heights reach about ______ ft. After 12 hrs traveling across the ocean, the wave
height does not exceed ______:
8...1.
14. By the time the wave reached the "6 hours" line west of Hawai'i, the wave moved slower in
some places than in others. The color coding reveals that ______ wave heights are associated
with slower wave speeds, meaning wave energy was being concentrated by wave refraction:
Lower.
15. The greatest impact of the Tōhoku tsunami on the U.S. mainland was probably in ______ or
Oregon:
Northern California.
16. According to the green observed values, the initial water rise after 1530Z on 11 March
2011was about ______ ft. above the predicted level:
2.5.
17. The water level then dropped to ______ ft. below the predicted level. After several hours, the
water level reached a height of about 7 ft. above predicted water level:
6.
18. Sea level is not rising uniformly around the United States. As seen in Figure 7A-6, sea level
is rising ______ along the West Coast compared to the East Coast:
Slower.
19. Where along the U.S. coastline is the trend of sea-level rise the greatest:
Gulf Coast.
20. What part of the U.S. is showing a significant drop in sea level?:
Southeast Alaska.
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