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# Tidescontinued - PowerPoint PPT Presentation

The Bay of Fundy is about 270 Km long and has an average depth of roughly 60m. ... which is close to the M2 period of 12.42 hours (or N2=12.66 hours, S2=12 hours) ...

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## PowerPoint Slideshow about 'Tidescontinued' - Kelvin_Ajay

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Presentation Transcript

Shallow water waves:Wavelength long relative to water depth

Deep water waves:Wavelength short relative to water depth

Phase speed depends on wavelength

Phase speed depends on depth of water column, not on wavelength! Thus all shallow-water waves propagate at the same speed in water of depth h

Wavelength: 2l Period: T Phase speed: 2l/T If SWW, then 2l/T=(gh)

Solving for the period, we get T=2l/(gh)

Wavelength: 4l Period: T Phase speed: 4l/T If SWW, then 4l/T=(gh)

Solving for the period, we get T=4l/(gh)

l=L/4

The Bay of Fundy is about 270 Km long and has an average depth of roughly 60m. Are these dimensions consistent with a resonant behavior of the semi-diurnal tides?

T=4l/(gh) = 4 x 270 x 1000 / (9.8 x 60) =

= 44,540 seconds

= 12.38 hours

which is close to the M2 period of 12.42 hours (or N2=12.66 hours, S2=12 hours)

Tidal ellipses depth of roughly 60m. Are these dimensions consistent with a resonant behavior of the semi-diurnal tides? Residual (time-averaged) currents