The Arctic is from the website list on the picture. The following news stories d
ID: 291131 • Letter: T
Question
The Arctic is from the website list on the picture. The following news stories describe and illustrate some of the coastal erosion and rapid thaw slumps that are occurring in the ice-rich permafrost around Tuktoyaktuk. Using these sources, answer the following questions (the second story, although older, has more information...) ttp://www.chc.caln http://www.nativecanadian.ca/Native_Reflections/Tuktoyaktuk/tuktoyaktukb.htm. 17) What is the average rate of retreat of the coastline at Tuk? What is the greatest recent retreat in a single year? (2 pts) land-arctic-beaufort-sea-tuktoyaktuk 18) What has the town of Tuk done to try to reduce coastline erosion? (2 pts) 19) How effective have these methods been? (1 pt) 20) Two possible reasons are given in the articles for the current rapid coastline retreat. Both are related to a change in climate. What are there reasons? (2 pts) Finally.... 21) Illustrate and describe the processes leading to a closed-system pingo (use an additional sheet if needed). (5 pts)Explanation / Answer
17) The average rate of retreat is about 1.5 metres per year. The greatest retreat in a single year recorded is about 40 meters.
18) i. The town of Tuk has brought up large boulders and put them on the beaches as a barrier against erosion.
ii. Sandbags were also put together to fight erosion.
iii. Metal fence was built to block sea waves.
iv. Great slabs of borrowed concrete have been hauled.
19) These methods have not been effective as the sea picked the sandbags and tosses them like pillowcases. The metal fence was also flattened by the sea.
20) The two possible reasons given are:
i. Now the region does not get that cold due to which it does not gets cold enough under the ground and this is the reason for melting of permafrost.
ii. There are speculations that the storms off the Beaufort Sea are created by the decreasing ice pack in the Canadian north. It creates a larger distance of open water, due to which large waves are created. Permafrost ground is highly sensitive to storm waves and it results in erosion of permafrost.
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