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Homework Help: Ocean physics (wave speed)

  1. May 4, 2009 #1
    The speed of water waves in shallow water is given approximately by:

    c^2 = gh

    A seiche is a standing wave in a shallow water basin with antinodes at ends and a node in the center.

    A lake is approximately a channel 9 km wide and 300 m deep. Calculate the seiche period for such a channel.

    ** What i think i can do with this problem is that i can use the height h=300m in the equation but i dont think that will give me the right answer. I am thinking that i should find the area of the channel but i dont know how to use that in the formula to find the speed.

    Any ideas?

    thank you
  2. jcsd
  3. May 4, 2009 #2


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    Homework Helper

    Why do you think using the height 300m will give you the wrong answer?
  4. May 4, 2009 #3
    When i did the calculations i got the answer as 54.2 s, which i think is not right for the period of wave. but i could be wrong, also i was thinking about using the width of the channel to see if i get a different answer. but i dont think that works out either.
  5. May 4, 2009 #4
    Oh yup i figured it out. I can use the formula of c = 2L / sqrt(g h)

    that give me the speed of a wave through a channel... thank you for your help!!
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