Estimating geoacoustic properties of marine sediment on the New Jersey Continental Shelf from broadband signals
Yong-min Jiang, A. Tolstoy

         This work will demonstrate the geoacoustic inversion “success” on data of using only one or two low frequencies, multiple ranges, and multiple realizations for geoacoustic inversion of actual SW06 data. The data used are the same as those processed by Jiang and Chapman and involves three ranges (1, 2, and 5 km) and multi-tonal continuous wave data collected on a 16 phone vertical array. Multiple realizations of the data were used where each reduced the non-uniqueness a bit. The multiple ranges and frequencies also reduced the non-uniqueness of the suggested solutions. however, there still remains a significant number (hundreds) of possible “solutions,” (values of ctop, cbot, hsed, and chsp) for which MFP<0.9 (including those suggested by Jiang and Chapman). The use of higher frequencies requires refinement of more parameters (such as the ocean sound-speed profile, source depth and range, water depth, and phone locations) but would not necessarily improve estimates of such bottom parameters as chsp and hsed. Thus, non-uniqueness of bottom parameters is an issue which may well exist for all inversion approaches.

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