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An Analysis of Coastal Erosion Along the Chukchi Coast at Barrow, Alaska
Leanne R. Lestak, William F. Manley, James A. Maslanik, Amanda H. Lynch and Timothy Buckley
University of Colorado and Barrow High School
Photo provided by Alaska Division of Emergency Services
Introduction What we found Methods Some hypotheses Future work A close-up look at the photomaps
The focus of this NSF project Coastal change between 1948 and 1997 Community dynamics
September 1986 Storm
Photos from The Open LeadLeavitt house
What we found in Barrow
1997 Shoreline in Green 1948 Shoreline in Red
37 m
Methods
Orthorectified 1997 aerial photography
Mosaic photos together
Register 1948 photos to 1997 photos
Digitize shorelines and bluff bottoms
Analyze difference in shoreline locations
Horizontal accuracy ca. 3.5 m
Orthorectify 1997 photos
Graphic from NASA
Photo contains distortions Register photo to Map using GCPs
Graphic from Richard Burns, PLSCaltrans Geometronics
Register 1948 photos to 1997 photos Mosaic Photos Together
Digitize shorelines and bluff bottoms
Analyze difference in shoreline locations
Horizontal accuracy ca. 3.5 m
No erosion south of gravel pit
High erosion at bluffs in Barrow
Aggradation in Browerville
Erosion is not continuous, it’s episodic
Short-term erosion vs. long-term erosion, problems are different
Why is there no change
south of the gravel pit?
Bathymetry
• Geomorphology• Permafrost differences• Curve in coastline
• What do you think?
Future work
This data is yours (NSB, High School, BASC) This is a preliminary study We will have intervening photo years:
29 July 1949 14 Aug 1955 Summer 1962 14 July 1964 15 July 1979 Summer 2002 (Quickbird image)
QuickBird satellite imagery.
Radar Imagery
• 70 cm (2 ft) pixels for panchromatic imagery (Black and White)• 2.8 m (8 ft) pixels for multi-spectral imagery (Red, Blue, Green, and Near-InfraRed bands)• 4 of 5 scenes successfully acquired Aug. 1 and 2• Fifth scene acquired before Aug. 31, pending cloud-free conditions
Preliminary “Browse Image” from Aug. 1, Barrow and Chukchi coast.
Preliminary close-up of buildings on Gas Well Road (70-cm resolution panchromatic image).
Future work
Study will extend up to Point Barrow Is this study reasonable? What else should we look at?
Let’s have a look at the
photo maps