This paper discusses the design and operation of a measurement apparatus used to conduct scale-model underwater acoustic propagation experiments, presents experimental results for an idealized waveguide, and compares the measured results to data generated by two-dimensional (2D) and three-dimensional (3D) numerical models. The main objective of this paper is to demonstrate the capability of the apparatus for a simple waveguide that primarily exhibits 2D acoustic propagation. The apparatus contains a computer-controlled positioning system that accurately moves a receiving transducer in the water layer above a scale-model bathymetry while a stationary source transducer emits broadband pulsed waveforms. Experimental results are shown for a 2.133m x 1.219m bathymetric part possessing a flat-bottom bathymetry with a translationally invariant wedge of 10 degrees slope along one edge. Beamformed results from a synthetic horizontal line array indicate the presence of strong in-plane arrivals along with weaker diffracted and horizontally refracted arrivals. A simulated annealing inversion method is applied to infer values for five waveguide parameters with the largest measurement uncertainty. The inferred values are then used in a 2D method of images model and a 3D adiabatic normal-mode model to simulate the measured acoustic data. (C) 2015 Acoustical Society of America.
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机译：本文讨论了用于进行比例模型水下声传播实验的测量设备的设计和操作，介绍了理想波导的实验结果，并将测量结果与二维（2D）和三维（ 3D）数值模型。本文的主要目的是证明该设备用于主要展现2D声传播的简单波导的功能。该设备包含一个计算机控制的定位系统，该系统可将接收换能器在水层中的比例模型测深法之上准确地移动，而固定源换能器则发射宽带脉冲波形。实验结果显示了一个2.133m x 1.219m的测深部分，该部分具有平底测深法，且沿一条边沿平移不变的楔形倾斜10度。合成水平线阵列的波束成形结果表明，存在强的平面内到达以及较弱的衍射和水平折射到达。应用模拟退火反演方法来推断具有最大测量不确定度的五个波导参数的值。然后，将推断的值用于图像模型的2D方法和3D绝热正常模式模型中，以模拟测得的声学数据。 （C）2015年美国声学学会。
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