Accession Number:

ADA639807

Title:

Transport of Gas and Solutes in Permeable Estuarine Sediments

Descriptive Note:

Technical rept.

Corporate Author:

FLORIDA STATE UNIV TALLAHASSEE DEPT OF EARTH OCEAN AND ATMOSPHERIC SCIENCE

Personal Author(s):

Report Date:

2011-09-30

Pagination or Media Count:

12.0

Abstract:

The long-term goals of this project are to do the following 1 quantify gas bubbles and their composition in shallow nearshore marine sand, and 2 to assess the role of gas bubbles in shallow sandy coastal sediment for the transport of solutes through the sand and sediment-water exchange of matter. Due to their compressibility, gas bubbles embedded in shallow water sediments cause interstitial water oscillations under passing surface gravity waves, and these oscillations provide a mechanism for enhanced solute dispersion and flux. The specific objectives of this research were as follows 1 to detect gas bubbles and in coastal and estuarine sand deposits and to assess temporal and spatial distribution of sedimentary bubbles in sublittoral beds including sands inhabited by microphytobenthos and seagrass 2 to quantify the size range and composition of the gas bubbles in the sediment and the overlying water, 3 to determine the volume change and migration velocities of interstitial bubbles and the links to pressure oscillations, 4 to assess dispersion and transport of solutes caused by bubble volume change and migration under different pressure conditions.

Subject Categories:

  • Physical and Dynamic Oceanography
  • Soil Mechanics
  • Test Facilities, Equipment and Methods

Distribution Statement:

APPROVED FOR PUBLIC RELEASE