Discussion
Groyne spacing is conventionally related to
Answer: D
Correct answer: the length of the groyne, typically two to three times it
The spacing is scaled to the groyne length because it is the length that determines how far offshore the drift is intercepted and therefore how wide a compartment the structure can hold in equilibrium. Spacing of two to three times the length is the usual starting point, adjusted for the obliquity of the waves. Tidal range, wave period and grain size all influence the design, but none of them sets the spacing directly.
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