GEL 16 Lecture Notes - Lecture 10: Tide, Apsis, Georgian Lari
Document Summary
Gel 16 - lecture 10 - tides and erosion. Gravitational forces of sun and moon (moon"s influence is about 2x stronger than sun) Tidal force: f = (g * mm) / d^3. Water would bulge slightly out from surface of earth in front of moon, as well as a bulge on the opposite side due to earth"s gravity (tidal bulge) This leads to high and low tides. During full moon or new moon: spring tides - tidal bulges from both sun and moon add up and tides are much higher/lower than usual. When moon is in quarter phases (1st quarter or 3rd quarter): moon is pulling on tide perpendicular to the sun"s pull, wich causes a counteracting force very little difference between high and low tide. Tidal schedules: semidiurnal (or semi daily) tide, mixed semidiurnal tide, or diurnal (daily) tide. Mixed semidiurnal tide is most unpredictable and complicated tide type, causes multiple high tides and low tides with wide variations.
