Methane Bubble Escape From Gas Horizon in Muddy Aquatic Sediment Under Periodic Wave Loading

Research output: Contribution to journalArticlepeer-review

Abstract

Ebullition of greenhouse methane (CH4) from the aquatic sediments is often observed at various hydrostatic pressure drops: at low tides, waves, and even at atmospheric pressure drops. It is especially pronounced at the different vent structures, for example, pockmarks, mud volcanoes, and cold seeps. The modeling conducted in the current study suggests that long timescale (glacial to centennial frequency) sea level drops may induce “stable” bubble ascent and control the position of the gas horizon in muddy aquatic sediment. Bubbles escape in the “dynamic” regime from the shallow gas horizon and subsequently to the water column is more feasible under shorter-period waves of higher amplitude travelling in shallow water. These findings are illustrated by examples of various vent structures (e.g., pockmarks), pronounced in shallow straits and bays, described in the literature.

Original languageEnglish
Pages (from-to)6507-6515
Number of pages9
JournalGeophysical Research Letters
Volume46
Issue number12
DOIs
StatePublished - 28 Jun 2019

Bibliographical note

Funding Information:
This project was supported by the Israel Science Foundation, grant 1441‐14. The data for this paper were obtained using the numerical modeling described in the paper. The author would like to thank the Editor and two anonymous reviewers for their substantial contributions in enhancing this paper. The author would also like to thank John K. Hall and Sharon Erez for editing this paper.

Publisher Copyright:
©2019. American Geophysical Union. All Rights Reserved.

Keywords

  • bubble
  • ebullition
  • fracture mechanics
  • methane
  • muddy sediment
  • waves

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences (all)

Fingerprint

Dive into the research topics of 'Methane Bubble Escape From Gas Horizon in Muddy Aquatic Sediment Under Periodic Wave Loading'. Together they form a unique fingerprint.

Cite this