Recent investigations of propagation models suggest that models need to be "bench-marked" each time they are applied to a different type of scenario. It is important that the user has properly input the various model parameters and checked their validity. Some of this "benchmarking" can be done using the wedge test cases of Jensen and Ferla, '90. Additional testing can involve more complicated scenarios, e.g., multiple sediment layers with range-dependence. Thus, there is a need for a variety of "benchmark" results. These results must often go beyond analytic solutions (such as those for an ideal wedge with point or line sources and perfectly reflecting boundaries). There are very few analytic solutions. Consistency checks between different types of models plus initial comparisons with carefully generated and accepted benchmark results are highly desirable.
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