Time-space variations of sediment density and porosity profiles due to beach deformations using X-ray CT

Abstract

Three-dimentional Digital photogrammetry and X-ray Computed Tomography (CT) have been applied to investigate a time-space evolution of sediment size and density profile due to beach profile changes in the laboratory wave flume conditions. The time-space variations of grain size distributions were measured using a spatial autocorrelation between pixels in digital images. The sediment density profiles in the collected sediment cores were measured using X-ray CT scanning. Reconstructing three-dimensional images using CT values, the evolution of the low bulk density region were examined. These experiments indicate possible importance of the spatial and temporal variations of sediment grain size and sediment porosity.