OCEAN FEATURE MODELS - THEIR USE AND EFFECTIVENESS IN OCEAN ACOUSTIC FORECASTING

The aim of this paper is to test the effectiveness of feature models i n ocean acoustic forecasting. Feature models are simple mathematical r epresentations of the horizontal and vertical structures of ocean feat ures (such as fronts and eddies), and have been used primarily for ass imilating new observations into forecasts and for compressing data. In this paper we describe the results of experiments in which the models have been tested in acoustic terms in eddy and frontal environments i n the Iceland Faeroes region. Propagation-loss values were obtained wi th a 2D parabolic-equation (PE) model, for the observed fields, and co mpared to PE results from the corresponding feature models and horizon tally uniform (range-independent) fields. The feature models were foun d to represent the smoothed observed propagation-loss field to within an rms error of 5 dB for the eddy and 7 dB for the front, compared to 10-15-dB rms errors obtained with the range-independent field. Some of the errors in the feature-model propagation loss were found to be due to high-amplitude 'oceanographic noise' in the field. The main conclu sion is that the feature models represent the main acoustic properties of the ocean but do not show the significant effects of small-scale i nternal waves and finestructure. It is recommended that feature models be used in conjunction with stochastic models of the internal waves, to represent the complete environmental variability.