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The calculation of wave height, - length and - period changes which result from trans-formation by currents and bottom are needed when solving engineering problems of sea and river hydraulics. It is possible to carry to number of such problems also a problem of construction and operation of sea channels which has big economic value. Modern sea channels can have width several hundreds of meters and difference of depths on the way to the channel and on an axis of the channel twice and more. Therefore, in calcula-tio...