Characterization of the physical and hydraulic properties of the sediment in karst aquifers of the Springfield Plateau,Central Missouri,USA |
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| Authors: | Eric W Peterson Carol M Wicks |
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| Institution: | (1) Department of Geography-Geology, Illinois State University, Campus Box 4400, 61790, Normal, IL, USA,;(2) Department of Geological Sciences, University of Missouri, 101 Geological Sciences Building, 65211, Columbia, MO, USA, |
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| Abstract: | Physical and hydraulic properties of sediment from two karst aquifers were measured to determine (1) the similarity of sediment
between karst aquifer systems and (2) the importance of sediment in modeling flow through karst aquifers. The sediment from
the two systems was similar in size and composition. Within both aquifers, the silt-sized sediment was composed primarily
of quartz, with minor amounts of plagioclase and clays. Hydraulic conductivity of the sediment measured directly (falling-head
test) ranged from 1.61×10−7 to 1.33×10−6 m s–1 and estimated using the Campbell equation ranged from 8.30×10−8 to 8.98×10−7 m s–1. These values of hydraulic conductivity fall within the span of hydraulic conductivities for carbonate rocks, indicating
that the sediment and carbonate matrix could be represented as one mathematical unit in modeling flow through karst aquifers.
Statistical agreement in the hydraulic conductivity values generated by the two methods indicates that the estimation technique
could be used to calculate hydraulic conductivities; thus allowing karst scientist to collect bulk sediment samples instead
of having to collect cores from within karst aquifers.
Electronic Publication |
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| Keywords: | Hydraulic properties Hydraulic testing Karst Physical properties Sediment |
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