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Q&A forum: Ocean Waves Calculator

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I am trying to use your WAVES calculator (CNOIDAL) to estimate the profile of a design wave on Lake Michigan in 35’ of water depth (10.671 m) with a height of 21’ (6.402 m) and a period of 10 seconds. The program output looks good for the first 90 degrees then gives me multiple peaks and troughs before 360 degrees. There is no problem with the Waves calculator's Cnoidal calculation option. Please refer to the explanation on Cnoidal waves with regard to the generation of these wave profiles.