Accession Number:

ADA522871

Title:

Sediment Formation in Nearshore Environments: Strength, Rheology, Microstructure, and Stability

Descriptive Note:

Annual project rept.

Corporate Author:

GEOLOGICAL SURVEY MENLO PARK CA

Personal Author(s):

Report Date:

2006-01-01

Pagination or Media Count:

8.0

Abstract:

Our goals are to understand how geotechnical and physical properties develop in marine sedimentary deposits on continental margins and how these properties influence sediment transport processes and the development of geomorphology. Our studies include predicting stability of sediment on the continental shelf and slope, providing input parameters for models of sediment transport and deformation, and distinguishing morphologic features caused by slope failure from those caused by other gravity-driven processes. Our studies also include improving our understanding of the transition between initial slope failure and the development of debris flows and turbidity currents and predicting the rheological properties that determine the dynamics of such flows. We applied this approach to the EuroSTRATAFORM project, within which we collaborate with scientists seeking to model the formation and alteration of nearshore sedimentary bodies. Our main objectives for FY06 focused on 1 understanding the ways in which sediment bodies develop shear strength and structure 2 testing shear strength development models in controlled environments, 3 furthering the development of concepts of seismic and biologic strengthening 4 assessing the signatures of catastrophic events to determine whether they are produced by deformational landsliding or depositional turbidity current sediment waves processes, with a particular attention to the Cap de Creus Canyon 5 providing the scientific community with rheological properties of fully deformed sediment masses to be used by turbidity current and debris flow modelers.

Subject Categories:

  • Physical and Dynamic Oceanography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE