The following discussions present specific information and examples of shallow 

 water sound speed variability and vertical gradient statistics for four selected sites. This 

 type of summary has been provided to support initial acoustic studies of shallow water 

 environments described in the main body of this report. Based on an evaluation of these 

 environmental summaries, this approach to sound speed profile classification and selection 

 can be modified or expanded for follow-on analyses of other shallow water environments. 



The data presentation for each site consists in part of certain summaries and displays 

 originally created for deep ocean analysis. These include the temperature-salinity-sound 

 speed statistical summary tables at standard depths, the composite profile plots for sound 

 speed which superimpose all profiles for a given site/season on a single plot and the 

 temperature-salinity (T-S) diagrams with sigma-T (density related) curves. A single sound 

 speed range and depth were selected for all composite plots to facilitate an intercomparison 

 of the different site environments. In addition, two statistical summaries are presented that 

 were specificaUy developed for the analysis of shallow water sound speed data. The shallow 

 water sound speed statistical summary provides some information on percentage of water 

 column coverage. Of more significance is the lower portion of this table where the surface- 

 to-standard-depth sound speed gradients are tabulated. The shallow water profile gradient 

 summary table provides the information necessary to evaluate the distribution of profile 

 types for each site/season and aid in the final selection of profiles for acoustic model inputs. 

 The presentations and discussions of specific model input data are contained in the main 

 body of this report. 



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