A modification of the constant-head permeameter to measure saturated hydraulic conductivity of highly permeable media
| Autor: | Sjoerd E. A. T. M. van der Zee, Klaas Metselaar, Juul Limpens, Jelmer Nijp, Harm P.A. Gooren |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Materials science
010504 meteorology & atmospheric sciences Soil test Water flow Laboratory method 0208 environmental biotechnology Clinical Biochemistry Soil physics Soil science Plant Ecology and Nature Conservation 02 engineering and technology 01 natural sciences Permeability Reynolds number symbols.namesake Sphagnum Hydraulic conductivity Low-resistance permeameter Geotechnical engineering lcsh:Science 0105 earth and related environmental sciences Permeameter ComputingMethodologies_COMPUTERGRAPHICS WIMEK Peat Compression Bodemfysica en Landbeheer Method Article PE&RC 020801 environmental engineering Soil Physics and Land Management Medical Laboratory Technology Permeability (earth sciences) Bodemgeografie en Landschap symbols Soil Geography and Landscape Plantenecologie en Natuurbeheer lcsh:Q Porous medium |
| Zdroj: | MethodsX MethodsX, 4, 134-142 MethodsX 4 (2017) MethodsX, Vol 4, Iss C, Pp 134-142 (2017) |
| ISSN: | 2215-0161 |
| Popis: | Graphical abstract The saturated hydraulic conductivity (Ks) is a key characteristic of porous media, describing the rate of water flow through saturated porous media. It is an indispensable parameter in a broad range of simulation models that quantify saturated and/or unsaturated water flow. The constant-head permeameter test is a common laboratory method to determine Ks on undisturbed soil samples collected from the field. In this paper we show that the application of this conventional method may result in a biased Ks in the case of highly permeable media, such as the top layer of Sphagnum peat and gravel. Tubes in the conventional permeameter, that collect water under the sample, introduce a hydraulic head-dependent resistance for highly permeable media and result in an underestimation of Ks. We present a simple and low-budget alternative of the constant-head permeameter test that overcomes the disadvantages of conventional permeameters. The new method was successfully tested on intact highly permeable peatmoss collected from a northern peatland. • Conventional constant-head permeameters underestimate Ks of highly permeable media due to flow resistance in tubing systems • We developed the low-resistance permeameter to overcome this disadvantage. • Testing of the low-resistance permeameter demonstrated no systematic bias and successful application for highly permeable media. |
| Databáze: | OpenAIRE |
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