A constant head well permeameter formula comparison: Its significance in the estimation of field-saturated hydraulic conductivity in heterogeneous shallow soils

N.A.L. Archer, M. Bonell, A.M. Macdonald, Neil Coles

Research output: Contribution to journalArticleResearchpeer-review

Abstract

© IWA Publishing 2014. We evaluate the application and investigate various formulae (and the associated parameter sensitivities) using the constant head well permeameter method to estimate field-saturated hydraulic conductivity (Kfs) in a previously glaciated temperate landscape in the Scottish Borders where shallow soils constrain the depth of augering. In finer-textured soils, the Glover equation provided Kfs estimates nearly twice those of the Richards equation. For this environment, we preferred the Glover equation with a correction factor for the effect of gravity, which does not include soil capillarity effects because: (1) the low depth to diameter ratio of the auger holes (AH) required in the shallow stratified soils of temperate glaciated environment needs a correction for gravity; (2) the persistently moist environment and the use of long pre-wetting times before measurements seem to reduce the effect of soil capillarity; (3) the Richards equation is dependent on accurate α∗ values, but the measured AH intersected soil horizon boundaries that had different soil structure and texture, causing difficulty in selecting the most appropriate α∗ value; (4) when comparing the different solutions to estimate Kfs using the constant-head well permeameter method against the AH method and ponded permeameter measurements, the Glover solution with a correction for gravity gave the best comparable result in fine-textured soil.
Original languageEnglish
Pages (from-to)788-805
JournalHYDROLOGY RESEARCH
Volume45
Issue number6
DOIs
Publication statusPublished - 2014

Fingerprint Dive into the research topics of 'A constant head well permeameter formula comparison: Its significance in the estimation of field-saturated hydraulic conductivity in heterogeneous shallow soils'. Together they form a unique fingerprint.

Cite this