Bottom properties similar to those found in the Santa Barbara Channel Experiment were used. With the simulation parameters established, the comparison between normal mode and parabolic equations was performed. The objective of the simulations was to determine what parameter to use in the PE simulation. The parameter was fixed at 5 meters. Simulations were performed with set to 1, 0.5, 0.25, and 0.125 meters.
Simulation results An error metric was constructed as a function of range.
From the scale indicated, the plots show little difference in accuracy between simulations across frequencies. One can qualitatively see the error decreases as frequency increases. Unfortunately, the density of the results give little insight into the effect of changes in . For 100 Hz, only the green 1.0 m line fails to match the Kraken line. As one increases frequency to 250 Hz, the differences between spacing becomes more distinct, with 1.0 m still not matching, but small mismatches in smaller increments.