Spring & neap tides

Pliny the Elder (23-79 A.D.): tides ‘follow’ the moon

Origin of tides - equilibrium model

Equilibrium means ‘no net force’

Explain this situation by saying that the two bodies are forced outward by an apparent (or fictitious) force - the centrifugal force

But have local inequities in forces

Net forces produce accelerations

Equilibrium tide

Solar equilibrium tide

Shortcomings of the equilibrium model

What is wrong with equilibrium model for the tides?

Dynamic theory for tides

The tidal wave

Standing waves

PPT Slide

Tidal standing waves

Kelvin waves

Amphidromic point (node) occurs near center of the basin

Tidal currents

Email: steven.wojtal@oberlin.edu

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