{'fraction_non_alphanumeric': 0.011303692539562924, 'fraction_numerical': 0.0, 'mean_word_length': 4.902222222222222, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Ocean Front Model Based on Sound Speed Profile and its Influence on Sound Propagation

In the ocean front environment, the existence of ocean front has an important impact on sound propagation due to the obvious change of sound speed profile. According to the two-dimensional parameterized model of ocean temperature front constructed by Olivier et al, we build a two-dimensional parameterized feature model of ocean front based on sound speed profile, calculate and compare the influence of ocean front on convergence area by setting different ocean front environment. The results show that when the sound wave propagates from the warm water mass to the cold water mass, the convergence area moves forward, and the degree of the forward movement changes with the intensity of the ocean front; when the sound wave propagates from the cold water mass to the warm water mass, the convergence area moves backward, and the degree of the backward movement changes with the intensity of the ocean front. We also analyze the reasons for the formation of the acoustic shadow area at a specific location under the condition of strong ocean front when the sound wave propagates from the warm water mass to the cold water mass, which may provide a reference for the acoustic concealment of the target under the environment of ocean front.