HR: 1330h
AN: H22C-0939 INVITED     [PDF]
TI: Hydrological and Petrophysical Properties of Unconsolidated sediments from Spectral Electrical Response Measurements.
AU: * Boadu, F
EM: boadu@akoto.egr.duke.edu
AF: Duke University, Dept. of Civil and Environmental Engineering, Durham, NC 27708
AB: Predicting the hydraulic properties of soils (hydraulic conductivity, porosity, and degree of saturation) from non-invasive geophysical measurements is appealing to geoscientists involved in the hydrological characterization and contamination assessment of the earth's subsurface. There is the need to understand the quantitative relationship between measurable geophysical attributes and hydraulic parameters of sediments or soils.. Variety of models (parametric and equivalent circuit) have developed for modeling spectral electrical response (SER) of soils, as a heterogeneous multi-phase system. The validity and usefulness of these models in predicting the hydraulic parameter were assessed using laboratory measurements of the spectral electrical response(0.01Hz to 10 kHz) of over 30 soil samples with wide variability in physical properties. The soils are fully characterized: hydraulic conductivity, porosity, grain size distribution and moisture content of each soil sample were measured. The SER measurements are utilized to estimate the hydraulic parameters characterizing the soils. The intrinsic parameters, which describe the response of the model are retrieved by inversion schemes and are used in empirical regression models to predict the soil properties. Such relationships between parameters characterizing the spectral electrical response of soils and their hydraulic properties may provide versatile non-invasive methodology of obtaining hydraulic conductivity and porosity of soils using geophysical measurements
DE: 5114 Permeability and porosity
DE: 5139 Transport properties
SC: Hydrology [H]
MN: 2003 Fall Meeting