A Study of Acoustic Characteristics at Sea Bottom Sediment Including Organic Matter
* Presenting author
At shallow area, organic rich sediment is piled up and run away according to the tidal stream or upper sea water movement. Authors measure the acoustic characteristics of organic rich sediment to monitor the movement of those sediment at the sea bottom. The bottom statement environmental changes affect benthic activities. Sample sediment was obtained from Ariake Sea in Japan, which consist with cray and many organic matter, was measured its acoustic speed and attenuation with the frequency of 2 MHz and 5 MHz in laboratory. At the same time, the grain size distribution was also measured. This result will help to understand the reflected waves from the sea bottom and sound propagation simulation in models.