Propagation anomalies in shallow Arctic water

Two anomalous propagation effects in shallow Arctic water are examined. The first effect involves anomalous dispersion (group velocity > phase velocity) associated with modal propagation in an upward refracting water column overlaying a solid bottom. The second effect concerns the anomalous frequency dependence of certain high velocity components of a wideband signal. This latter effect is attributed to the contribution of the continuous spectrum to the total field in a channel with slightly rough boundaries. Theoretical results obtained from a normal mode model are compared, over a wide range of frequencies, with experimental data obtained using explosive sources.