F湖声场简正波建模

近年来，已发展了水声场建模的多种算法，不同模型分别适用于不同的场合，在特定环境下，对不同的距离范围，不同的频率范围，各模型有不同的计算效率和不同的计算精度。中简要介绍了F湖的声学环境，讨论了F湖典型环境条件下的简正波建模问题，并计算了典型水条件下的传播损失。

On Suitability of Normal-Mode Underwater Acoustic Modeling for Experimental Research in an Ideal Chinese Lake

Normal mode underwater acoustic modeling is one of four principal modeling methods . The conditions for its suitability for F Lake, an ideal Chinese lake for experimental acoustic research, have not yet been determined. Section 1 describes the environmental acoustic features of F lake: sound speed profile (subsection 1.1);lake surface (subsection 1.2);lake bottom (subsection 1.3). Eq. (1) in subsection 1.1 is the empirical sound speed formula we propose for F lake;this formula relates sound speed to water temperature and depth. Section 2 gives a fast acoustic field computation method and explains how to avoid pitfalls when applying this method. Section 3 gives a numerical example, whose simulation results are shown in Fig.3 (summer) and Fig.4 (winter). These results show preliminarily that normal mode underwater acoustic modeling is at least suitable for low frequency and long distance.