TIDES

Trujillo and Thurman, 10^th - Be sure to read box 9.1 (Tidal bores); omit section on tidal power and box 9.2

Objectives: students should be able to

1. discuss the forces that produce tides, including neap and spring tides

2. describe characteristics of semidiurnal, diurnal and mixed tides

3. discuss the impact that tides have on rivers and inlets

Forces: gravitational and centripetal; bulges of water due to resultant forces

Equilibrium tides: water covered, no-friction earth

· Be able to describe the position of earth, moon, sun, and the resultant water bulges

· Spring vs. neap tides

Dynamic tides: real world; modified by orbits, declination, shape of basin

· Diurnal, semidiurnal, and mixed tides – be able to draw or describe characteristics

· Tides in bays with inlets: ebb and flood tidal currents, slack water

· Tidal bores