Model tests are performed in order to predict the noise level of a full ship and to control its noise signature. Localizing noise sources in the model test is therefore an important research subject along with measuring noise levels. In this paper, a noise localization method using a hydrophone array in a large cavitation tunnel is presented. The 45-channel hydrophone array was designed using a...

Passive acoustics are widely used to monitor the presence of dolphins in marine environment. This study aims introduce a low-cost and homemade approach for assembling complete underwater microphone (i.e., hydrophone), employing cheap easy obtain components. The hydrophone was assembled with two piezo disks connected balanced configuration encased plastic container filled foam. hydrophone’s perf...

Understanding the properties of wildfire-disrupted catchments is crucial for managing river floods and landslide risks. Using a hydrophone, we investigated changes in sediment supply conditions small mountainous (30.8 ha) southern Korea 6 years (March 2014–December 2019). Bedload transport rates mostly increased burned 1–2 post-wildfire (early post-fire regime) but decreased 3 owing to coverage...

In shallow water, passive sonar usually has great difficulty in discriminating a surface acoustic source from an underwater one. To solve this problem, supervised machine learning method using only one hydrophone is implemented paper. Firstly, simulated training data are generated by normal mode model KRAKEN with the same environment setup as that SACLANT 1993 experiment. Secondly, k-nearest ne...