Show simple item record

dc.contributor.authorReginato, R. J.
dc.contributor.authorJackson, R. D.
dc.date.accessioned2013-08-28T16:25:33Z
dc.date.available2013-08-28T16:25:33Z
dc.date.issued1971-04-23
dc.identifier.issn0272-6106
dc.identifier.urihttp://hdl.handle.net/10150/300115
dc.descriptionFrom the Proceedings of the 1971 Meetings of the Arizona Section - American Water Resources Assn. and the Hydrology Section - Arizona Academy of Science - April 22-23, 1971, Tempe, Arizonaen_US
dc.description.abstractKnowledge of the dynamic water content-pressure potential relationship within the soil profile is useful in determining the importance of hysteresis under natural conditions. Continuous monitoring of water content in the field is now possible using recently developed gamma-ray transmission equipment which allows water content measurements in 1 cm-thick soil layers with an error of 0.0009 gm/gm. The nuclear equipment and the tensiometer assembly for pressure measurements are described. Soil water content and pressure in the top 10 cm of a field soil profile were measured continuously for a 2-week period following an irrigation. The highest water content was measured each day just before sunrise. This declined rapidly from early morning to early afternoon, and was followed by a gain during the mid-afternoon and evening. The amplitude of this diurnal change diminished with time after irrigation. The pressure potential at a depth of 1.5 cm decreased most rapidly as the water content declined, but not exactly in phase. This may have been due to temperature effects on the pressure metering system. A moisture characteristic curve was constructed from the data.
dc.language.isoen_USen_US
dc.publisherArizona-Nevada Academy of Scienceen_US
dc.rightsCopyright ©, where appropriate, is held by the author.en_US
dc.subjectWater resources development -- Arizona.en_US
dc.subjectHydrology -- Arizona.en_US
dc.subjectHydrology -- Southwestern states.en_US
dc.subjectWater resources development -- Southwestern states.en_US
dc.subjectSoil moistureen_US
dc.subjectSoil profilesen_US
dc.subjectWater pressureen_US
dc.subjectMeasurementen_US
dc.subjectTensiometersen_US
dc.subjectOn-site data collectionsen_US
dc.subjectHysteresisen_US
dc.subjectGamma raysen_US
dc.subjectSoil temperatureen_US
dc.subjectSoil moisture tensionen_US
dc.titleField Measurements of Soil-Water Content and Soil-Water Pressureen_US
dc.typetexten_US
dc.typeProceedingsen_US
dc.contributor.departmentU.S. Water Conservation Laboratory, Soil and Water Conservation Research Division, Agricultural Research Service, U.S. Department of Agriculture, Phoenix, Arizona 85040en_US
dc.identifier.journalHydrology and Water Resources in Arizona and the Southwesten_US
dc.description.collectioninformationThis article is part of the Hydrology and Water Resources in Arizona and the Southwest collections. Digital access to this material is made possible by the Arizona-Nevada Academy of Science and the University of Arizona Libraries. For more information about items in this collection, contact anashydrology@gmail.com.en_US
refterms.dateFOA2018-08-30T13:31:10Z
html.description.abstractKnowledge of the dynamic water content-pressure potential relationship within the soil profile is useful in determining the importance of hysteresis under natural conditions. Continuous monitoring of water content in the field is now possible using recently developed gamma-ray transmission equipment which allows water content measurements in 1 cm-thick soil layers with an error of 0.0009 gm/gm. The nuclear equipment and the tensiometer assembly for pressure measurements are described. Soil water content and pressure in the top 10 cm of a field soil profile were measured continuously for a 2-week period following an irrigation. The highest water content was measured each day just before sunrise. This declined rapidly from early morning to early afternoon, and was followed by a gain during the mid-afternoon and evening. The amplitude of this diurnal change diminished with time after irrigation. The pressure potential at a depth of 1.5 cm decreased most rapidly as the water content declined, but not exactly in phase. This may have been due to temperature effects on the pressure metering system. A moisture characteristic curve was constructed from the data.


Files in this item

Thumbnail
Name:
hwr_01-143-151.pdf
Size:
65.32Kb
Format:
PDF

This item appears in the following Collection(s)

Show simple item record