Accession Number:

ADA609860

Title:

Gas Bubble Growth in Muddy Sediments

Descriptive Note:

Annual rept.

Corporate Author:

DALHOUSIE UNIV HALIFAX (NOVA SCOTIA) DEPT OF OCEANOGRAPHY

Report Date:

2000-09-30

Pagination or Media Count:

7.0

Abstract:

Our long term goal is a quantitative, mechanistic and predictive understanding of the dynamics of bubbles and bubble populations in marine sediments. We believe this information can be used to improve and test acoustic backscatter models for sediments and better understand the ebullitive flux of methane, an important greenhouse gas , to the atmosphere. The immediate objective is a working model for the growth of a single, isolated bubble in a marine sediment, validated with bubble growth data obtained in laboratory studies and with in situ data. We have a strategy of coordinated laboratory and modelling research to achieve our objective. The laboratory work directed by Bruce Johnson and assisted by Bruce Gardiner and Regine Maass aims to determine the size that bubbles can attain in sediments, internal variables like pressure, and the dynamic response of sediments to bubble growth. The modelling research Bernard Boudreau and Bruce Gardiner, guided by the laboratory results, is developing appropriate models for observed bubble growth.

Subject Categories:

  • Hydrology, Limnology and Potamology
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE