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Fig. 5. Drag force experienced by forereef (filled symbols) and backreef (open
symbols) shapes of (A) very flexible models, (B) flexible models, (C) stiff
models and (D) extra-buoyant models at increasing unidirectional flow speed.
Data are not shown for non-buoyant or rigid models as these comparisons were
made by adding lead shot to stiff models, and attaching a steel rod to stiff
models, altering their buoyancy and flexural stiffness but not their
shape.