Polymer tensiometers with ceramic cones: direct observations of matric pressures in drying soils
| Autor: | C.W. Hoogendam, M.J. van der Ploeg, G. H. de Rooij, Henk Kruidhof, Cindy Huiskes, Luuk K. Koopal, Gerben Bakker, H. P. A. Gooren |
|---|---|
| Přispěvatelé: | Inorganic Membranes |
| Jazyk: | angličtina |
| Rok vydání: | 2010 |
| Předmět: |
Materials science
Laboratorium voor Fysische chemie en Kolloïdkunde Soil science water-content lcsh:Technology tensile-strength lcsh:TD1-1066 sensor Vadose zone Leerstoelgroep Bodemnatuurkunde Ceramic CB - Bodemfysica en Landgebruik lcsh:Environmental technology. Sanitary engineering Reflectometry Water content Physical Chemistry and Colloid Science lcsh:Environmental sciences lcsh:GE1-350 WIMEK Moisture suction lcsh:T hydraulic-properties lcsh:Geography. Anthropology. Recreation Leerstoelgroep Bodemnatuurkunde ecohydrologie en grondwaterbeheer Soil Physics ecohydrologie en grondwaterbeheer Permanent wilting point Water potential time-domain reflectometry lcsh:G Ecohydrology and Groundwater Management visual_art Soil water visual_art.visual_art_medium Soil Physics Ecohydrology and Groundwater Management osmotic tensiometer performance SS - Soil Physics and Land Use |
| Zdroj: | Hydrology and Earth System Sciences, 14(10), 1787-1799 Hydrology and Earth System Sciences, Vol 14, Iss 10, Pp 1787-1799 (2010) Hydrology and Earth System Sciences 14 (2010) 10 Hydrology and earth system sciences, 14(10), 1787-1799. Copernicus |
| ISSN: | 1027-5606 1607-7938 |
| Popis: | Measuring soil water potentials is crucial to characterize vadose zone processes. Conventional tensiometers only measure until approximately −0.09 MPa, and indirect methods may suffer from the non-uniqueness in the relationship between matric potential and measured properties. Recently developed polymer tensiometers (POTs) are able to directly measure soil matric potentials until the theoretical wilting point (−1.6 MPa). By minimizing the volume of polymer solution inside the POT while maximizing the ceramic area in contact with that polymer solution, response times drop to acceptable ranges for laboratory and field conditions. Contact with the soil is drastically improved with the use of cone-shaped solid ceramics instead of flat ceramics. The comparison between measured potentials by polymer tensiometers and indirectly obtained potentials with time domain reflectometry highlights the risk of using the latter method at low water contents. By combining POT and time domain reflectometry readings in situ moisture retention curves can be measured over the range permitted by the measurement range of both POT and time domain reflectometry. |
| Databáze: | OpenAIRE |
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