CAS ES 142 Final: BeachesShoresFinalExam

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Greater tidal prism and larger number of tidal inlets allows more sediment influx. Larger tidal range produces more zone for marsh development. Flood currents- flow landward into bay during the rising tide. Ebb currents- flow out of bays & inlets during falling tide. Slack water- no currents, occur at low & high tides ocean and bay water levels are equal. Tidal range and currents: microtidal tr < 2. 0 m. Mesotidal 4. 0 m > tr > 2. 0 m. *see formation of tidal wave diagram ppt10 slide 3. Tides can be separated into 3 time periods: 1/3 high tide, 1/3 low tide, 1/3 rising or falling. *see diagram ppt 10 slide 4 what tidal currents do: transport sand onshore and offshore. Keep tidal channels open and flushed of sediment. Longshore currents together with wave suspension of sand transports sand along the underwater beach. Controls coastal morphology: barriers, bays, lagoons, tidal inlets, marshes, tidal deltas.

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