Accession Number:

ADA636866

Title:

Quantitative Chemical Mass Transfer in Coastal Sediments During Early Diagenesis: Effects of Biological Transport, Mineralogy, and Fabric --- Phase 3

Descriptive Note:

Corporate Author:

NAVAL RESEARCH LAB STENNIS DETACHMENT STENNIS SPACE CENTER MS

Personal Author(s):

Report Date:

1999-09-30

Pagination or Media Count:

7.0

Abstract:

LONG-TERM GOAL. The long-term goal of this study is to develop a better mechanistic and quantitative understanding of the effects of biologically enhanced transport, mineralogy, sediment fabric, and particle surface chemistry on biogeochemical reactions occurring in coastal sediments. Specifically, we plan to integrate quantitative expressions of the strongly coupled effects of bioirrigation, bioturbation, mineralogy, and sediment fabric on chemical mass transfer from field and laboratory mesocosm studies using numerical modeling. OBJECTIVES. The short term objective during FY99 was 1 to achieve a better understanding of the bio-geologic dynamics of estuarine sediments by quantitatively describing the relationship between bioturbation, sediment physical properties, and permeability and 2 to accurately compute the permeability coefficient from two-dimensional images using Effective Medium Theory EMT, and verify results with in situ, mesocosm and laboratory permeability measurements. Our hypothesis is that bioturbation will alter sediment microfabric and thus sediment permeability.

Subject Categories:

  • Biological Oceanography
  • Geology, Geochemistry and Mineralogy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE