Quantification of Sediment Properties from Pore Structure and Grain Contacts: A Microcomputed Tomography Analysis of SAX04 Sands
NAVAL RESEARCH LAB STENNIS SPACE CENTER MS SEAFLOOR SCIENCES DIRECTORATE
Pagination or Media Count:
During the Sediment Acoustic eXperiment SAX04, sediment physical properties e.g., porosity and permeability, determined by the arrangement of sand grains and the topology of the pore space, were evaluated in two ways first, packing density in unconsolidated sand was adjusted from minimum to maximum density by vibration and second, diver-collected cores were impregnated with polyester casting resin to maintain pore and grain morphologies. Sediment pore-morphology and grain data was captured in volumetric x-ray Computed Tomography CT images and quantified using a new grain-based algorithm. Porosity was calculated from the image data by voxel counting and permeability was determined using the Kozeny-Carman method, which is determined from porosity and grain size data. Grain contacts, an important determinant of frame modulus, were also determined.
- Physical and Dynamic Oceanography