GEOL 1303 - assignment #4

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University of Houston *

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1303

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Geography

Date

Apr 3, 2024

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pdf

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2

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ALASKA RIVERS 1) Navigate to the Alaska River 1 Pin: a. Based on river channel morphology, what type of river is shown at this location? Alluvial Braided Stream b. What about the regional climate contributes to the river having this morphology? A large supply of sediments and high seasonal discharge contribute to the river having this morphology. 2) Navigate to the Alaska River 2 Pin: Change the date on the historical imagery to 8/2012. a. Based on river channel morphology, what type of river is shown at this location? Alluvial Meandering Stream b. Using the “time machine” button to change the date of the displayed satellite image to 8/2012. What is the name of the different features that are part of this type of river system show at the following pins: A: Point bar B: Cut bank C: Meander scrolls D: Oxbow lake 3) Event: Use the “time machine” button to change the date of the displayed satellite image to 12/1985 and observe any changes at the location of the pin labeled “event” from 12/1985 to 8/2012. a. Comparing the image from 1985 to 2012 what is different about the river channel at this location? The river’s position has migrated from 1985 to 2012. It went from a meandering river to eventually an oxbow lake. b. What is the name of the process that occurred here? Erosion occurred here. BRAZOS RIVER TX: Navigate to the Brazos River, TX Pin: 4) Using the “time machine” button look at the image from 1/2006. How far away from the riverbank is the structure marked by the pin labeled “barn” in meters (m)? (use the ruler tool: – zoom in to measure) 138 meters
5) Although the structure is no longer there, how far away from the riverbank is the pin currently located? (Turn off the “time machine” button to get the best image of current status) 28 meters 6) What is the name of the process that has occurred along the riverbank over time? Lateral migration occurred along the riverbank over time. 7) Based on the change between 2006 and 2022, what is the rate of riverbank movement in meters per year (m/yr)? (divide the change in distance to the riverbank by the number of years - report answer to one decimal place only – show work!) 6.9 m/yr 8) Based on this rate in how many years will the newer building immediately south of the old structure marked by the pin labeled “New Building” be destroyed? (divide current distance by rate of riverbank movement – show work!) 4.763 years
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