TIDES: Chapter 9; be sure to read
Objectives: Students should be able to
1. Discuss the forces that
produce tides
2. Describe how neap and spring
tides are formed
3. Describe characteristics of
open ocean, semidiurnal, diurnal and mixed tides
4. Discuss the impact that
tides have on rivers and inlets
5. Discuss the feasibility of
tidal power plants
Forces
· Gravitational attraction of earth-sun, earth-moon
· Centripetal forces
Equilibrium tides: water covered, no-friction earth
· Be able to draw position of earth, moon, sun, and water bulges
· Spring tides
· Neap tides
Dynamic tides: real world; modified by orbits, declination, shape of basin
· Open ocean tides: rotation around amphidromic point of a cotidal line
· Types of tides: be able to define and draw, if necessary
§ Diurnal
§ Semidiurnal
§ Mixed
· Tides in bays with inlets: ebb and flood currents, slack water
· Tides in some rivers: tidal bores
Tidal power plants: conditions necessary