- Title
- Hydraulic heterogeneity in a highly weathered basaltic regolith : Impact on lateral-flow and solute transport
- Creator
- Rasiah, Velu; Armour, John; Florentine, Singarayer
- Date
- 2012
- Type
- Text; Journal article
- Identifier
- http://researchonline.federation.edu.au/vital/access/HandleResolver/1959.17/37007
- Identifier
- vital:4803
- Identifier
- ISSN:1058-3912
- Abstract
- Reliable on-ground information on groundwater (GW) hydraulic heterogeneity is required to determine flow direction and quantities, but its experimental characterization is difficult because of the complexities associated with the interaction involving the temporal changes in space modified by regolith stratigraphy. The impact of the aforementioned variables, particularly stratigraphy in a 51 m thick highly weathered basaltic regolith in the northeast humid tropics of Queensland, Australia, on flow gradients and directions was investigated in this study. Regolith cores at 1 m increments indicated that there were 3 different major strata. The temporal changes in water table, hydraulic- and pressure- heads, and solute concentrations in space indicated the top 51 m aquifer was contiguous, dynamic and hydraulically differentiated into three segments which approximately corresponded with the regolith strata. The lateralflow and solute transport from each aquifer segment was controlled by depth to water table, the number of regolith layers the segment covered, and the solute concentration.
- Relation
- Journal of Environmental Hydrology Vol. 20, no. 13 (2012), p.
- Rights
- Copyright International Association for Environmental Hydrology
- Rights
- This metadata is freely available under a CCO license
- Subject
- Aquifer; Basalt; Chemical weathering; Concentration (composition); Heterogeneity; Hydraulic conductivity; Regolith; Solute; Temporal variation; Water table; Australia; Queensland
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