Aquatic Science WU:

1
Aquatic Science WU

• Continue lab from last class

2
Class Objectives

• Finish lab from last class
• Wave review
• Currents

3
Wave Terminology

• Crest
• Trough
• Amplitude
• Wavelength

4
Wave Terminology

• Frequency
• Period
• Wave speed
• Interference

5
As waves approach the shore

• Wavelength shortens
• Speed slows
• Amplitude increases
• Breakers form

6
When shoreline is steep

• Large curling wave and tube produced
• Plunging waves

7
When shoreline slopes gradually

• Spilling waves form

8
Forces in Water

• Fg pushes down
• FB pushes up

9
An object sinks when

• Fg is greater than FB

10
Gravitational Current

• Mass of water sinking downward

11
Water rises when

• FB is greater than Fg

12
Water floats when

• FB Fg

13
Thermohaline Circulation

• Mvt. due to temp. and salinity differences
• Precipitation dilutes
• Freezing, evaporation concentrates water sinks,
  currents form

14
Ocean Circulation pic
15
Coriolis Effect

• Earth spins velocity greater at equator
• Water moves faster at equator

16
Wind Currents

• Speed of water decreases with depth
• Water deflected
• Net effect - 90º

17
Major Current

• Gulf Stream warm water from equator to northern
  latitudes

18
Upwelling

• Deep currents rise at landmasses
• Mixes nutrients