TidesAmelia Cook & Kim Bunch

What is it?Tides are essentially bulges in the sea surfaceThe rise and fall if water level constitutes the tideRotation of the earth brings any point on the surface through the

increasing and decreasing gravitational pull of the moon and sunMost predictable occurrence on this planet

How is it happening?Tides are on the shores of the world oceans, almost everywhere, sea

level fluctuates regularly.The gravitational attraction between the moon and earth, and

between the sun and earth cause tides.The moon, which is 239,000 miles away from the earth, produces a

greater percentage of earth’s tides than the sun does. The sun is further away at 93,000,000 miles from the earth. Moon tides (lunar tides) are twice as strong as sun tides (solar tides).

In most parts of all the oceanic coastlines, there are normally two (2) flood tides (high tides) and two (2) ebb tides (low tides) about every 25 hours

Flood Tides and Ebb TidesTide 1 Tide 2

Flood Tide 6 hours 13 minutes

6 hours 13 minutes

Ebb Tide 6 hours 13 minutes

6 hours 13 minutes

Total 12 hours 26 minutes

12 hours 26 minutes

Move water toward the ocean

Move water toward the coast

24 hours and 52 minutes

Monthly Tidal CycleSpring Tides Neap TidesSun, Moon, and Earth alignment Sun and Earth alignment

Life on EarthTides and currents carry nutrients, moderate temperatures, and

influence conditions in numerous ecosystemsCoastal cities have to build their buildings that are on the coast to

certain codes and far enough away so the tides and waves don’t crash into the buildings and ruin the structures

Tidal Power

Tidal PowerLike Wind TurbinesLimited places the could be of

use1966 Bay of Fundy, Canada

Tidal Power

Tidal PowerPros ConsRenewable energyRequires no fuelCould last 100 yearsHigh efficiencyEnvironmental impact locally not

globallyStorm surge barrier

Damage to the local aquatic environment

No fish migration to selected areaRestrict access to open watersCapture dirt, waste, pollutionReduce kinetic energyImpact the local birds

Problems?

Solutions?Scientists are currently developing things that would help solve the

problem, or at least give everyone a warning that they are going to be coming to shore to prevent people from eating the contaminated food