The representation that we have been using indicates the shape of the water surface at one particular instant in time.
Consider a point on your diagram where a crest meets a crest.
How would the displacement of the water surface at this point change over time? (e.g., what would the displacement be one-quarter period later? What would it be one-half period later?)
Consider what happens at a point on your diagram where a crest meets a trough.
How will the displacement of the water surface at this point change over time?
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