Soil water thermodynamic to unify water retention curve by pressure plates and tensiometer
<p dir="ltr">The pressure plate method is a standard method for measuring the pF curves, also called soil water retention curves, in a large soil moisture range from saturation to a dry state corresponding to an applied pressure of near 1500 kPa. However, the pressure plate can only...
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2014
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| author | Erik Braudeau (19497142) |
| author2 | Gaghik Hovhannissian (19497144) Amjad T. Assi (19497146) Rabi Mohtar (13235553) |
| author2_role | author author author |
| author_facet | Erik Braudeau (19497142) Gaghik Hovhannissian (19497144) Amjad T. Assi (19497146) Rabi Mohtar (13235553) |
| author_role | author |
| dc.creator.none.fl_str_mv | Erik Braudeau (19497142) Gaghik Hovhannissian (19497144) Amjad T. Assi (19497146) Rabi Mohtar (13235553) |
| dc.date.none.fl_str_mv | 2014-10-31T09:00:00Z |
| dc.identifier.none.fl_str_mv | 10.3389/feart.2014.00030 |
| dc.relation.none.fl_str_mv | https://figshare.com/articles/journal_contribution/Soil_water_thermodynamic_to_unify_water_retention_curve_by_pressure_plates_and_tensiometer/26413024 |
| dc.rights.none.fl_str_mv | CC BY 4.0 info:eu-repo/semantics/openAccess |
| dc.subject.none.fl_str_mv | Earth sciences Hydrology Environmental sciences Soil sciences pressure plate apparatus tensiometric measurement soil moisture characteristic curve soil water retention curve pF curves matric potential pedostructure hydrostructural parameters |
| dc.title.none.fl_str_mv | Soil water thermodynamic to unify water retention curve by pressure plates and tensiometer |
| dc.type.none.fl_str_mv | Text Journal contribution info:eu-repo/semantics/publishedVersion text contribution to journal |
| description | <p dir="ltr">The pressure plate method is a standard method for measuring the pF curves, also called soil water retention curves, in a large soil moisture range from saturation to a dry state corresponding to an applied pressure of near 1500 kPa. However, the pressure plate can only provide discrete water retention curves represented by a dozen measured points. In contrast, the measurement of the soil water retention curves by tensiometer is direct and continuous, but limited to the range of the tensiometer reading: from saturation to near 70–80 kPa. The two methods stem from two very different concepts of measurement and the compatibility of both methods has never been demonstrated. The recently established thermodynamic formulation of the pedostructure water retention curve, will allow the compatibility of the two curves to be studied, both theoretically and experimentally. This constitutes the object of the present article. We found that the pressure plate method provides accurate measurement points of the pedostructure water retention curve h(W), conceptually the same as that accurately measured by the tensiometer. However, contrarily to what is usually thought, h is not equal to the applied air pressure on the sample, but rather, is proportional to its logarithm, in agreement with the thermodynamic theory developed in the article. The pF curve and soil water retention curve, as well as their methods of measurement are unified in a same physical theory. It is the theory of the soil medium organization (pedostructure) and its interaction with water. We show also how the hydrostructural parameters of the theoretical curve equation can be estimated from any measured curve, whatever the method of measurement. An application example using published pF curves is given.</p><h2>Other Information</h2><p dir="ltr">Published in: Frontiers in Earth Science<br>License: <a href="https://creativecommons.org/licenses/by/4.0/" target="_blank">https://creativecommons.org/licenses/by/4.0/</a><br>See article on publisher's website: <a href="http://dx.doi.org/10.3389/feart.2014.00030" rel="noreferrer" target="_blank">http://dx.doi.org/10.3389/feart.2014.00030</a></p> |
| eu_rights_str_mv | openAccess |
| id | Manara2_b520c6266edf13047a4d8d0712589847 |
| identifier_str_mv | 10.3389/feart.2014.00030 |
| network_acronym_str | Manara2 |
| network_name_str | Manara2 |
| oai_identifier_str | oai:figshare.com:article/26413024 |
| publishDate | 2014 |
| repository.mail.fl_str_mv | |
| repository.name.fl_str_mv | |
| repository_id_str | |
| rights_invalid_str_mv | CC BY 4.0 |
| spelling | Soil water thermodynamic to unify water retention curve by pressure plates and tensiometerErik Braudeau (19497142)Gaghik Hovhannissian (19497144)Amjad T. Assi (19497146)Rabi Mohtar (13235553)Earth sciencesHydrologyEnvironmental sciencesSoil sciencespressure plate apparatustensiometric measurementsoil moisture characteristic curvesoil water retention curvepF curvesmatric potentialpedostructurehydrostructural parameters<p dir="ltr">The pressure plate method is a standard method for measuring the pF curves, also called soil water retention curves, in a large soil moisture range from saturation to a dry state corresponding to an applied pressure of near 1500 kPa. However, the pressure plate can only provide discrete water retention curves represented by a dozen measured points. In contrast, the measurement of the soil water retention curves by tensiometer is direct and continuous, but limited to the range of the tensiometer reading: from saturation to near 70–80 kPa. The two methods stem from two very different concepts of measurement and the compatibility of both methods has never been demonstrated. The recently established thermodynamic formulation of the pedostructure water retention curve, will allow the compatibility of the two curves to be studied, both theoretically and experimentally. This constitutes the object of the present article. We found that the pressure plate method provides accurate measurement points of the pedostructure water retention curve h(W), conceptually the same as that accurately measured by the tensiometer. However, contrarily to what is usually thought, h is not equal to the applied air pressure on the sample, but rather, is proportional to its logarithm, in agreement with the thermodynamic theory developed in the article. The pF curve and soil water retention curve, as well as their methods of measurement are unified in a same physical theory. It is the theory of the soil medium organization (pedostructure) and its interaction with water. We show also how the hydrostructural parameters of the theoretical curve equation can be estimated from any measured curve, whatever the method of measurement. An application example using published pF curves is given.</p><h2>Other Information</h2><p dir="ltr">Published in: Frontiers in Earth Science<br>License: <a href="https://creativecommons.org/licenses/by/4.0/" target="_blank">https://creativecommons.org/licenses/by/4.0/</a><br>See article on publisher's website: <a href="http://dx.doi.org/10.3389/feart.2014.00030" rel="noreferrer" target="_blank">http://dx.doi.org/10.3389/feart.2014.00030</a></p>2014-10-31T09:00:00ZTextJournal contributioninfo:eu-repo/semantics/publishedVersiontextcontribution to journal10.3389/feart.2014.00030https://figshare.com/articles/journal_contribution/Soil_water_thermodynamic_to_unify_water_retention_curve_by_pressure_plates_and_tensiometer/26413024CC BY 4.0info:eu-repo/semantics/openAccessoai:figshare.com:article/264130242014-10-31T09:00:00Z |
| spellingShingle | Soil water thermodynamic to unify water retention curve by pressure plates and tensiometer Erik Braudeau (19497142) Earth sciences Hydrology Environmental sciences Soil sciences pressure plate apparatus tensiometric measurement soil moisture characteristic curve soil water retention curve pF curves matric potential pedostructure hydrostructural parameters |
| status_str | publishedVersion |
| title | Soil water thermodynamic to unify water retention curve by pressure plates and tensiometer |
| title_full | Soil water thermodynamic to unify water retention curve by pressure plates and tensiometer |
| title_fullStr | Soil water thermodynamic to unify water retention curve by pressure plates and tensiometer |
| title_full_unstemmed | Soil water thermodynamic to unify water retention curve by pressure plates and tensiometer |
| title_short | Soil water thermodynamic to unify water retention curve by pressure plates and tensiometer |
| title_sort | Soil water thermodynamic to unify water retention curve by pressure plates and tensiometer |
| topic | Earth sciences Hydrology Environmental sciences Soil sciences pressure plate apparatus tensiometric measurement soil moisture characteristic curve soil water retention curve pF curves matric potential pedostructure hydrostructural parameters |