Experimental observations of diurnal acoustic propagation effects in seagrass meadows on the Dongsha Atoll.

Large regions with seagrass meadows have been discovered on Dongsha Atoll located in the South China Sea. The aim of this study is the estimation of acoustic propagation loss in the frequency range of individual bubble resonance due to the gas content of seagrass in seagrass meadows. Specifically, this study seeks to (a) investigate the attenuation of the mid-frequency (2-8 kHz) signal induced by the gas content in a seagrass meadow and (b) present the diurnal variation of sound attenuation. The results demonstrate that >40 dB diurnal variations of mid-frequency propagation loss was observed in shallow seagrass meadow region.