气候变化领域集成服务门户(CCPortal): Acoustic and optical determination of bubble size distributions

CCPortal

DOI	10.1016/j.ijggc.2021.103313
	Acoustic and optical determination of bubble size distributions – Quantification of seabed gas emissions
	Li J.; White P.R.; Roche B.; Bull J.M.; Leighton T.G.; Davis J.W.; Fone J.W.
发表日期	2021
ISSN	17505836
卷号	108
英文摘要	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 time-averaged 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 CO2 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/day in response to a known gas injection flow rate 143 kg/day, indicating 22–62% of the injected CO2 is emitted from the seabed in gaseous form, with the remainder being trapped, or dissolved. © 2021 Elsevier Ltd
英文关键词	Bubbles; CCS; CO2; Greenhouse gas; Identification; Marine Carbon Capture and Storage; Underwater acoustics
scopus关键词	Acoustic noise; Bubbles (in fluids); Carbon dioxide; Gas emissions; Signal processing; Signal to noise ratio; Size distribution; Acoustic characteristic; Anthropogenic activity; Bubble size distributions; Frequency band width; Identification techniques; Injection flow rate; Optical determination; Time-averaged acoustics; Underwater acoustic communication
来源期刊	International Journal of Greenhouse Gas Control
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/177183
作者单位	Institute of Sound and Vibration Research, University of Southampton, Southampton, SO17 1BJ, United Kingdom; Ocean and Earth Science, University of Southampton, National Oceanography Centre, Southampton, SO14 3ZH, United Kingdom; Bullard Laboratories, University of Cambridge, Cambridge, CB3 0EZ, United Kingdom
推荐引用方式 GB/T 7714	Li J.,White P.R.,Roche B.,等. Acoustic and optical determination of bubble size distributions – Quantification of seabed gas emissions[J],2021,108.
APA	Li J..,White P.R..,Roche B..,Bull J.M..,Leighton T.G..,...&Fone J.W..(2021).Acoustic and optical determination of bubble size distributions – Quantification of seabed gas emissions.International Journal of Greenhouse Gas Control,108.
MLA	Li J.,et al."Acoustic and optical determination of bubble size distributions – Quantification of seabed gas emissions".International Journal of Greenhouse Gas Control 108(2021).