Underwater Cartography: The Art of Bathymetry

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Underwater Cartography The Art of Bathymetry

• By Alan Lee and Neil Fitzharris

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Aquaman, Manager of Fish

• Fish stocking quotas
• Chemical rehabilitation

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For the Rock Lovers

• Estimate rates of sedimentation.

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So Im not a limnologist, hunter, fisher, or
natural resources manager. What do bath
measurements have to do with me?
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If I Were the Most Ballin I-Banker This is How I
Would Do Bathymetry

• A sonar sends out sound to make the map.

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Gorilla Positioning Satellite (Because Thats
What Id Use it For)

• Go across the lake on transects.
• Check whether youre going straight through
  longitude and latitude.

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Two guys. One boat. No motor. Junk GPS.

• Line of sight method
• Used raft, didnt work well

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Bathymetry, the Jack Lalanne Way!

• Got out and dragged the boat.

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Island Hoppin

• Took perimeter of lake, except for near cliff
  wall.
• Took points on islands.

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Calculations

• Surface Area 68,537 m2
• Volume 69,887 m3
• Maximum Depth 2 m
• Average Depth 0.87 m

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Whats left

• More work on the map
• Groundtruthing
• Long-term storage of data

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Future Bathymetry

• Caution against doing bathymetry over again.
• Develop fish management plan.
• Sedimentation and geology studies.

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Thanks! Arigato! Danke! Mm goi! Merci! Mahalo!
Tanks ah! Xie Xie!

• We appreciate the help of Brien Holsapple for
  lending us the boat, Professor Dina Leech for
  advice and help, Beth Wilkerson for her
  invaluable assistance with ArcGIS, and all you
  guys for a great semester and for your time and
  attention!