FIG. 13. (Color online) (Top) Transmission loss as a function of frequency determined from airgun signals measured by receiver 1 at a distance of approximately 40 km (dotted line). Values of low SNR (below 1 dB) are not shown. The solid line is a numerical prediction using the WNI method and a range-independent bathymetry model with the geoacoustic parameters given in Table I. The dashed line shows the numerical prediction by the PE method applied to the same acoustic environment model but with the rangedependent bathymetry shown by the dashed line in Fig. 8. (Bottom) Same as top figure but for the signal measured at receiver 2. The PE numerical prediction shown here used the bathymetry model shown by the dashed line (2) in Fig. 8.
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