GEOSC 040 Lecture Notes - Lecture 22: Continental Margin, Wind Wave, Tide
Document Summary
Catadromous fish migrate from freshwater to saltwater to spawn. Using satellite data to track swells and their relationships to wind (storms) Equilibrium theory- provides a basic understanding of tides. Dynamic theory- complexities of coastlines, bays, ocean basin geometry, earth deformation. Semidiurnal tides have a range that cycles over a 14 day period: coincides with the moons 28 day orbital period. Monthly inequality: max semi-diurnal tides occur when spring tides coincide with lunar perigee. Predicting tides is difficult: factors to consider. Must also take into account storms, wind patterns, etc. Moons orbit around earth is elliptical: apogee farthest, perigee- closest. Difference is important because gravitational attraction is proportional to square of distance: declination of lunar orbit varies 28. 5 degrees above and below the equator during lunar month. During days 6-8 of spring tide, the tide is bigger: max semi-diurnal tides occur when spring tides coincide with lunar perigee.
