Abstract:

Application of the refined iterated grid search (RIGS) MFP inversion method to four of the WORKSHOP97 test cases (SD, AT, SO, and WA) has resulted in some surprisingly accurate estimates for some geoacoustic parameters, i.e., sediment densities and attenuations, source ranges and depths, and some sediment gradients. Another surprise was the sensitivity of the inversion to small errors in the KRAKEN propagation model. This paper will discuss recent efforts to understand the benefits and shortcomings of the RIGS method and to propose future directions.