Scheda di dettaglio – i prodotti della ricerca
| Dato | Valore |
|---|---|
| Title | Mercury intrusion porosimetry and centrifuge methods for extended-range retention curves of soil and porous rock samples |
| Abstract | The water retention function is essential for modeling flow and transport in porous media. Its experimental determination is still challenging because each of the standard methods is limited to partial moisture ranges. The pore-size distribution (PSD) obtained by the mercury intrusion porosimetry (MIP) may be used as a unifying property that spans across the individual ranges of retention properties obtained with standard methods. This study compares the MIP and quasi-steady centrifuge (QSC) methods with standard ones (suction table, evaporation, and dewpoint potentiameter) to determine the retention curves of subsoil clods and calcareous rocks over most of the moisture range. The selected soils, having a relatively rigid structure compared with other soils, are more similar to the rocks even if there is a non-negligible difference in terms of mechanical strength. The QSC, developed for rock samples, was tested for soil to see if the method is also applicable for mechanically less stable media. The porosity characteristics of soil and rock samples showed bi- and trimodal PSDs. The single MIP test allowed describing the mercury retention curve (MRC) for most of the volumetric mercury content range. The MRCs could be used to fill the gaps in the retention curves that occur with the standard retention procedure when switching from one measurement range to the other. The MIP and QSC methods proved to be relatively fast and reliable for measuring a wider range of the retention curve. However, the application of QSC method to soil samples is limited by effects of compaction due to centrifugal force. |
| Source | Vadose zone journal 21 (1) |
| Keywords | mercury retention curvessoil clodscalcareous rockmultimodal porosity |
| Journal | Vadose zone journal |
| Editor | Soil Science Society of America,, Madison, Wis., Stati Uniti d'America |
| Year | 2021 |
| Type | Articolo in rivista |
| DOI | 10.1002/vzj2.20176 |
| Authors | Turturro, Antonietta C.; Caputo, Maria C.; Gerke, Horst H. |
| Text | 465778 2021 10.1002/vzj2.20176 ISI Web of Science WOS 000734493200001 mercury retention curves soil clods calcareous rock multimodal porosity Mercury intrusion porosimetry and centrifuge methods for extended range retention curves of soil and porous rock samples Turturro, Antonietta C.; Caputo, Maria C.; Gerke, Horst H. CNR National Research Council, IRSA, Water Research Institute, via Francesco De Blasio 5, Bari 70132, Italy Research Area 1 Landscape Functioning , Working Group Hydropedology , Leibniz Centre for Agricultural Landscape Research ZALF , Eberswalder Straße 84, Muncheberg D 15374, Germany The water retention function is essential for modeling flow and transport in porous media. Its experimental determination is still challenging because each of the standard methods is limited to partial moisture ranges. The pore size distribution PSD obtained by the mercury intrusion porosimetry MIP may be used as a unifying property that spans across the individual ranges of retention properties obtained with standard methods. This study compares the MIP and quasi steady centrifuge QSC methods with standard ones suction table, evaporation, and dewpoint potentiameter to determine the retention curves of subsoil clods and calcareous rocks over most of the moisture range. The selected soils, having a relatively rigid structure compared with other soils, are more similar to the rocks even if there is a non negligible difference in terms of mechanical strength. The QSC, developed for rock samples, was tested for soil to see if the method is also applicable for mechanically less stable media. The porosity characteristics of soil and rock samples showed bi and trimodal PSDs. The single MIP test allowed describing the mercury retention curve MRC for most of the volumetric mercury content range. The MRCs could be used to fill the gaps in the retention curves that occur with the standard retention procedure when switching from one measurement range to the other. The MIP and QSC methods proved to be relatively fast and reliable for measuring a wider range of the retention curve. However, the application of QSC method to soil samples is limited by effects of compaction due to centrifugal force. 21 Published version https //acsess.onlinelibrary.wiley.com/doi/10.1002/vzj2.20176 11/11/2021 Mercury intrusion porosimetry and centrifuge methods forextended range retention curves of soil and porous rock samples file pdf dell articolo pubblicato VZJ_11_nov_2021.pdf Articolo in rivista Soil Science Society of America, 1539 1663 Vadose zone journal Vadose zone journal Vadose zone j. Vadose zone journal VZJ VZJ online antoniettacelesteturturro TURTURRO ANTONIETTA CELESTE mariaclementina.caputo CAPUTO MARIA CLEMENTINA |