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Fig. 10. (A) Water velocity and model position during the passage of a wave. For
water velocity, positive numbers indicate the water is moving in one direction
in the wave tank, and negative numbers indicate that the water is moving in
the other direction. In each direction the water speed increases to a maximum
velocity and then slows down before reversing and going in the other
direction. Position indicates the distance deflected by the model at a
particular water velocity. (B) Position of stiff and flexible models during
the passage of a wave. Stiff models are deflected the maximum distance during
high velocities, and begin to right themselves as the flow slows. Flexible
models are deflected the maximum distance just before the flow begins to move
in the opposite direction. (C) Position of models of various levels of
buoyancy during the passage of a wave. Extra-buoyant and non-buoyant models
are deflected less during each wave than are moderately buoyant models, and
are extended in the direction of flow during higher velocities than are
moderately buoyant models.
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