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Pond Dance

Published on Nov 20, 2015

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PRESENTATION OUTLINE

1.

Pond Stratification

  • Distinct layers of water
  • Low O2 in one
  • Don't mix
  • Density is the issue
Photo by nosha
2.

Thermocline

  • Small Layer ... fast temp change
  • Warmer water on one side
  • Cooler on the other
  • You'll know when you hit it swimming
Photo by Arn@ud Ab@die
3.

Spring Overturn

  • Pond temperature uniform
  • Wind helps
  • Surface water moves downwind
  • Bottom water moves upwind
4.

Summer

  • Epilimnion, top, forms = warmer
  • Hypolinion, bottom, cooler
  • Gets stronger as summer advances
  • No mixing unless really strong winds
5.

Fall Overturn

  • Uniform temperature again
6.

Winter stratification

  • Reversed - warmer on bottom
  • Ice locks it in
7.

Factors

  • Depth of pond - 2+ m
  • A lot of wind
  • Major rain fall
  • Help - aeration
Photo by Sam Ilić

Chris Byron