Spring and Neap Tides

Spring tides produce the maximum tidal range when the earth, moon and sun are all in alignment. This produces the greatest gravitational pull on the oceans. The moon and sun gravitational pull is additive.





Neap tides produce the minimum tidal range when the moon and sun are at a right angle to each other. This alignment minimizes the gravitational pull of the moon.

Beach Retention

Groins- artificial protection of the beach usually placed at right angles to slow longshore transport.
















Beach nourishment- the deposition of sand by mechanical means to help stop beach erosion. The sand is usually pumped ashore from barges off the coast.

Tide Cycles

Tides typically fall into three categories:

• semidiurnal- two high tides and two low tides per day, same amplitude
  
• mixed- amplitude differs quite significantly
• diurnal- one high tide and one low tide per day, same amplitude
  

Waves

Breaking waves- waves break when the depth of the wave reaches 1/2 of its wavelength. The wave starts to "feel bottom" and slows down due to friction. The top part of the wave continues at speed and outruns the bottom of the wave. Gravity will then pull the top part of the wave down causing it to break.

Wave size depends on three factors: fetch-distance wind can travel uninterupted, wind speed and how long the wind blows.

Upwelling- cold water from depth replacing warmer water from the surface.

Seashore

Beaches are the accumulation of material on the shore. The material typically is sand but can be other materials.

Longshore current-the movement of sand along a coast driven by wave action.


Tombolo-an above water bridge of sand connecting an off shore feature to the mainland.

Week of 5/14/12

Chemistry
Monday- Napoleon's Buttons
Tuesday- review questions start Thermodynamics
Wednesday- quiz on Gas Laws
Thursday- thermodynamics
Friday- computer lab, work on your paper.

Physical Science
Monday- Thursday- oceanography
Friday- computer lab work on 'Stream Project"

Since some of you still have not completed the 'Topo Quiz" during the assigned time. I will open it back up
for 75% of the total points.

Week of 5/7/12

Chemistry
Monday- Charles Law/hand out report directions
Tuesday- gas properties
Wednesday-Napoleon's Buttons
Thursday- Ideal Gas Law
Friday- Napoleon's Buttons

Physical Science
Monday-Friday- Oceanography


Remember NO computer lab this week.