MAST200 Lecture Notes - Lecture 12: Tide, Oceanic Basin, Centrifugal Force

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bluesalmon173

12 Oct 2016

School

University of Delaware

Department

Marine Studies

Course

MAST200

Professor

Thoroughgood Carolyn

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Document Summary

Tides are slow up and down movements of the sea level once or twice a day. Have a wave form, but are not wind waves. Caused by interactions of the ocean, sun, moon. Are rhythmic variations of sea level with periods of about 6 or 12 hours, depending on where you are on earth. Are very long waves (up to circumference of earth) Move in response to the forces exerted by the sun and moon. Progress toward the coastlines where the sea surface regularly rises and falls. Vertical difference between high and low tides called tidal range. Tidal period of time between consecutive high or low tides and varies between 12 hrs 25 mins, to 24 hrs 50 mins. Wavelength of an average tide can be up to 17,000 km. Shallow water waves have a depth less than 1/20 wavelength and deepwater waves have a depth greater than 1/2.

Related Questions

I heard you on ABC Breakfast talking of the full moon effect. Ihave suffered in no small way from it all my life and medicatemyself to sleep in a full moon, otherwise I don't sleep. As anengineer and science interested person I have thought a lot aboutthis phenomenon and have come up with a theory, which I'm verysurprised has not been considered previously. You said in yourarticle that gravity was excluded as a factor, but this is not thecase. Gravity is affected by the mass of the moon and it'sproximity to your location. The tides have complex interactionswith the earth and the sun, so making conclusions from the tidesalone is not always valid in relation to gravitational forces.Lakes are not tidally affected because there is no where for thewater to go. The ocean tidal waters don't go up and down like abath tub level, they go in and out like the waves on a beach. Iconclude that the increase of the gravitational force makessensitive people restless, and hence in a sleep lab, they are stillexposed to gravitational changes. I suggest the way to verify thisis to measure the gravitational force at different cycles of theearth and moon. I am also affected by air pressure in a similarway.When the air pressure is high, and it'sa full or near fullmoon, I'm unable to sleep without medication, and if I do partiallysleep, I have wild dreams. When the opposite is the case, I sleeplike the dead. Temperature is the other obvious variable thatexacerbates this cocktail of influences as well. Also, from anatural selection view, maybe we are restless at times of full moonas we are more visible to night predators, and need to keep morealert for that. As I said, I'm amazed that science hasn't resolvedthis question a long time ago. So much of nature is cycled by themoon.

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MAST200 Lecture Notes - Lecture 12: Tide, Oceanic Basin, Centrifugal Force

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