Can I read Acoustic and optical determination of bubble size distributions – Quantification of seabed gas emissions on EtoBox?

Acoustic and optical determination of bubble size distributions – Quantification of seabed gas emissions by Li, Jianghui (author);White, Paul R. (author);Roche, Ben (author);Bull, Jonathan M. (author);Leighton, Timothy G. (author);Davis, John W. (author);Fone, Joseph W. (author) is a Engineering article available to read on EtoBox.

What is Acoustic and optical determination of bubble size distributions – Quantification of seabed gas emissions about?

Passive acoustic techniques can be used to identify and quantify underwater gas release at natural sites, or at locations related to anthropogenic activities. There are still significant issues in extracting bubble signals from background noise, particularly for bubble counting and sizing techniques relying on inversion of the timeaveraged acoustic spectrum. In this work we propose an adaptive single bubble identification technique, which incorporates bubble acoustic characteristics including pulsation time interval, frequency bandwidth and radiation strength. The method applies a cross-spectrogram, enabling an increase in signal-to-noise ratio resulting in a reduction of the false alarm rate on bubble identification. We demonstrate this technique using an array of hydrophones to determine the bubble size distribution and gas flux at a controlled CO 2 release site, 4 m beneath the seabed, at 120 m water depth in the central North Sea. The results show that the bubble radius, as estimated using acoustics has a distribution with a peak in the 0.15-0.3 cm range, while an estimate based on optical method suggests a range of 0.2-0.5 cm. The gas flux is acoustically estimated as 32-88 kg

Who reads Acoustic and optical determination of bubble size distributions – Quantification of seabed gas emissions?

Author

Li, Jianghui (author);White, Paul R. (author);Roche, Ben (author);Bull, Jonathan M. (author);Leighton, Timothy G. (author);Davis, John W. (author);Fone, Joseph W. (author)

Publisher

Elsevier BV

Published

2021

Language

EN

Field

Engineering (Physical Sciences)