Abstract
Acoustical monitoring method could monitor wide area such as ocean because it can spatially measure the measurement object with a few sensors. It is important to monitor ocean structure changes for understanding global climate changes and for controlling aquatic resources. We investigated sound propagation characteristics using sound propagated data measured at Hashirimizu port of Yokosuka, Japan in August 2006 and 2007. The experimental area was very shallow water with the average depth of 5 m and travel distance of 110 m. M‐sequence signal alternately propagated every 30 seconds from each bank side. Water depth change caused by tide affected received signal amplitude traveled with the frequency of 12 kHz and 80 kHz. It was also confirmed from simulated sound pressure by FDTD method through the change of assumed water depth. Furthermore, water temperature fluctuation could be confirmed from the travel time changes.
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