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- W334923657 abstract "In southern Illinois, glacially-derived surficial deposits control recharge and the migration of contaminants to regional groundwater resources. This study measured the field-saturated hydraulic conductivity of the diamicton and the overlying loess with a Guelph permeameter specially modified to take measurements to a depth of 5 m. Six field sites were chosen, along a transect trending about 50 kilometers southeast of the Mississippi Valley. Along this transect, the loess units thin dramatically, from 8 to 1 m and from 6 to 0.2 m for the Peoria and Roxana Silts, respectively, and the relative influence of the Ohio/Wabash Valleys source area increases. Twenty boreholes were drilled at each site at a spacing of 1.5 m forming a random grid pattern. Initial conductivity tests were conducted near the base of the loess in the B/C, or where possible C, horizon of the modern soil. Boreholes were then deepened and tests were conducted within the oxidized diamicton. The statistical relation between field-saturated hydraulic conductivity, particle size distribution, clay mineralogy, fracture distribution, and weathering zone was investigated. The main factors influencing spatial variability in field-saturated hydraulic conductivity are: (1) particle size distribution, (2) clay mineralogy, and (3) differences in soil development. Source area (Mississippi vs.more » Ohio/Wabash Valley systems) and distance from the source area control these physical factors.« less" @default.
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- W334923657 date "1992-01-01" @default.
- W334923657 modified "2023-09-23" @default.
- W334923657 title "Field-saturated hydraulic conductivity of unsaturated surficial deposits along the southern extent of the Illinoian glaciation, southern Illinois" @default.
- W334923657 hasPublicationYear "1992" @default.
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