1 / 22

Kenai Fjords National Park

Kenai Fjords National Park. DMoutoux & Earth Science Class of 2015. Where is Kenai Fjords National Park?. Why Visit Kenai Fjords National Park?. View arctic marine wildlife Visit fjords and glaciers Sea kayak, hike, backpack Find solitude – most of the park is inaccessible by car.

chogan
Télécharger la présentation

Kenai Fjords National Park

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Kenai Fjords National Park DMoutoux & Earth ScienceClass of 2015

  2. Where is Kenai Fjords National Park?

  3. Why Visit Kenai Fjords National Park? • View arctic marine wildlife • Visit fjords and glaciers • Sea kayak, hike, backpack • Find solitude – most of the park is inaccessible by car

  4. How Plate Tectonics Affect the Park… • Southern coast of Alaska lies along a convergent plate boundary • Pacific Plate subducting beneath NA Plate • 4 Active Volcanoes on the Kenai Peninsula • Large & frequent earthquakes • One of the largest recorded earthquakes, MR 9.2 struck nearby in 1964

  5. Plate Tectonics Affects Rock Type … • Pillow Basalts from Volcanoes

  6. Plate Tectonics Affects Rock Type … • Batholith • Magma that cools Underground • Granodiorite (like granite, but darker)

  7. Plate Tectonics Affects Rock Type … • Accreted Terranes • Foreign land transported by the Pacific Plate and scraped off on the coast • Chert & Basalt from the ocean floor • Limestone (old coral reef)

  8. Plate Tectonics Affects Rock Type … • Produces Fractures • Injected with superheated water carrying minerals • Iron, silica (quartz), arsenic, and gold

  9. Kenai Fjord National Park Today … • Half the park covered in ice • Glaciers originate in the Harding Ice Field

  10. Kenai Fjord’s Past … • About 30,000 year ago, the entire Kenai Peninsula was covered by an ice sheet, much like Greendland or Antarctica West AntarcticIce Sheet

  11. Kenai Fjord’s Past … • Elevation was higher • Tectonic action is causing subsidence(slow sinking) • Diagram shows subsidence following the 1964 earthquake

  12. Mechanical Weathering & Erosion by … • Glaciers • Waves

  13. How Glaciers Form • Abundant snowfall • Harding Icefield receives 60 feet of snow per year. • Cool summers • More snow accumulates than melts • Air squeezed out as snow accumulates • Becomes glacial ice in 4-10 years. • Vertical relief • To allow flow downhill • Tremendous weight of glacier crushes and abrades rock • Flow transport debris downhill.

  14. Glacier-carved Features • U-Shaped Valleys

  15. Glacier-carved Features • Morraines – Piles of eroded rock left by retreating glaciers

  16. Glacier-carved Features • Glacial Marks

  17. Glacier-carved Features • Fjords – a long, narrow, deep glacier-carved valley filled by ocean water • Found only in Norway, Greenland, New Zealand, Chile, and Alaska

  18. How Does a Glacier Carve a Fjord? • During an ice age, ocean water levels are much lower, so valleys can be longer • After the ice age, water level rises and fills the long, narrow, and deep u-shaped valley. • Glaciers carve deep u-shaped valleys, but stop at the edge of the ocean

  19. Wave-carved Features • Pounding surf erodes the coast • Softer rock (limestone) far more susceptible than basalts and granodiorite

  20. Kenai Fjord’s Future • Near Future - Embattled glaciers • 3% decrease in area of Harding Ice Field in the last 16 years • Estimated 40 cubic miles of glacial loss in Alaska annually • 1000’s of Years Gradual filling of fjords • Sediments accumulate at rates of up to a foot a year. • Fjords that are 600 to 1000 feet deep could be filled within the next couple thousand years. • Long Term - Continued subsidence • The ocean will slowly encroach on the park.

  21. Bibliography • More, Inventory And Monitoring Network Learn about the various projects being studied. Read. National Parks Service. 19 Jan. 2013. National Parks Service. 12 Feb. 2013 <http://www.nps.gov/kefj/naturescience/index.htm>. • "Geomorphology." Geomorphology. 12 Feb. 2013 <http://svp.soic.indiana.edu/svp/4970813/FID1/html/ecosys/physical/geomorph.htm>. • "Moraine on Pederson Glacier, Aialik Bay, Kenai Fjords NP, Alaska." Panoramio. 12 Feb. 2013 <http://www.panoramio.com/photo/1268828>. • "McCarty Fjord and glacier, Kenai Fjords National Park, Alaska - aerial photograph (aat)."Panoramio. 12 Feb. 2013 <http://www.panoramio.com/photo/76217421>. • "Glaciers: Earth’s Rivers of Ice — Icebergs and Glaciers — Beyond Penguins and Polar Bears."Beyond Penguins and Polar Bears Glaciers Earths Rivers of Ice Comments. 12 Feb. 2013 <http://beyondpenguins.ehe.osu.edu/issue/icebergs-and-glaciers/glaciers-earths-rivers-of-ice>.

  22. Bibliography • "West Antarctic Ice Sheet Science Traverse." : The Ice. 12 Feb. 2013 <http://waisdividetraverse.blogspot.com/2010/12/ice.html>. • "Harding Icefield." Photo Blog Photography Blog for Niebrugge Images Harding Icefield Comments. 12 Feb. 2013 <http://www.my-photo-blog.com/harding-icefield>. • "LARRY'S RAMBLE." : 2011-02-13. 12 Feb. 2013 <http://larrysramble.blogspot.com/2011_02_13_archive.html>. • "Kurt Friehauf - Alaska 2011 project description - Kenai FjordsNational Park." Kurt Friehauf - Alaska 2011 project description - Kenai FjordsNational Park. 12 Feb. 2013 <http://faculty.kutztown.edu/friehauf/alaska_2011/kenai_fjords/>.

More Related