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Solute movement in the active layer, Taymyr, Siberia

Solute movement in the active layer, Taymyr, Siberia

Special Report - Corps of Engineers, U S

Time domain reflectometry (TDR) has been used extensively for determining the dielectric constant and water content of soils, and relationships for measuring soil water conductivity are being developed. The technique is particularly well-suited to use in the Arctic, where in situ and potentially remote methods are important. The objective of this study is to evaluate TDR as a field technique for bulk electrical conductivity sigma (sub b) and soil water electrical conductivity sigma (sub w) in arctic soils. Calibration measurements of sigma (sub b) were carried out at a field site in Siberia (74 degrees 32'14"N; 98 degrees 35'52"E). TDR-determined sigma (sub w) using the model of van Loon et al. (1991) is compared to electrical conductivity sigma (sub w) of solution obtained with suction cups. Best results are obtained when using a probe specific calculated soil electrical conductivity sigma (sub s) , rather than one value for this soil type. This is thought to be a reflection of soil coarseness and heterogeneity. Data of sigma (sub w) obtained for this field site are reported for one field site in Siberia from spring to fall 1995. Infiltration into the frozen soil in spring and exclusion of solutes during fall freeze-back were observed using TDR.

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Accession: 020043965

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