Abstract
The leading and trailing edges of a plane ice plate and the perimeter of a polynya represent arrangements of wedge scatterers that are mirrored in the adjacent, pressure‐release, water‐air interface. As a result, an edge that is exposed to low‐frequency underwater sound will backscatter energy in a pattern that closely resembles radiation from an acoustic dipole. Likewise, the reradiation from a lead whose separation is small compared to a wavelength can resemble radiation from a quadrupole. The reason for this behavior, and its significance in the total low‐frequency scatter from the Arctic canopy, is discussed in terms of wedge theory and the laboratory scale model experiments, which confirm this interpretation. [Work supported by ONR.]
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