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offshore waves of height H=3mand period T=9s, approaching a beach of slope 1/200at an angle of 42 degrees. To protect the beach from litoral drift, a series of groynes have been installed. Assuming that longshore sediment transport in front of the groynes is 63%of the longshore transport elsewhere (consider the first breaking event only), what is the new beach angle relative to the original beach line that groynes would induce?

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