Abstract
A comparison of theoretical and experimental results has been carried out for propagation into an acoustic shadow zone resulting from refraction caused by a thermal gradient. The experiments were carried out on a very large, dry mud flat under no wind conditions. The existing thermal gradient was measured as part of the procedure. The theoretical results follow closedly from Pekeris [C. L. Pekeris, J. Acoust. Soc. Am. 18, 259–315 (1946)] but include the effects of finite surface impedance and a logarithmic temperature profile. An assessment of the importance of turbulent scattering under these conditions is carried out. [Work supported by NSF.]
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