Acoustical method for measuring the gas content in bottom sediments
Authors: Komissarova, N.; Furduev, A.
Source: Acoustical Physics, Volume 50, Number 5, September 2004 , pp. 571-574(4)
Publisher: MAIK Nauka/Interperiodica
Abstract:Gas bubbles in the bottom of shallow-water seas and freshwater basins lead to a substantial decrease in the sound speed. The gas content in the bottom changes because of the variability of the biological activity and water contamination, therefore serving as an indicator of the environmental equilibrium in the basin. It is proposed to monitor the gas content in bottom sediments by measuring the frequency spectrum of the bottom reflection coefficient in a broad frequency band. The data of calculations are presented for the sound speed in gas-containing sediments and for the values of the bottom reflection coefficient. A method is proposed for monitoring the gas content by measuring the frequency and angular characteristics of the natural ambient noise.
Document Type: Research article
Publication date: 2004-09-01