Abstract
The conditions under which an outward-flowing surface current can prevent the passage of waves coming in from the sea are investigated mathematically. Two types of current are considered: (
a
) a current with uniform velocity extending to a depth
h
; (
b
) a current with velocity decreasing uniformly and vanishing at depth
h
. They have very similar effects. The mean velocity required to stop waves of given frequency is rather greater in case (
a
) than in case (
b
). The water current produced by a curtain of air bubbles from a perforated tube on the sea bottom is investigated theoretically on the assumption that the bubbles are very small. Evans (1955) has measured the surface currents produced in a tank by a bubble curtain and finds them smaller than predicted. The discrepancy is partly due to the fact that the bubbles were not very small.
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