Evapotranspiration from Natural Vegetation in the Central Valley of California: Monthly Grass Reference-Based Vegetation Coefficients and the Dual Crop Coefficient Approach.
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| Title: | Evapotranspiration from Natural Vegetation in the Central Valley of California: Monthly Grass Reference-Based Vegetation Coefficients and the Dual Crop Coefficient Approach. |
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| Authors: | Howes, Daniel J.1 djhowes@calpoly.edu, Fox, Phyllis2 phyllisfox@gmail.com, Hutton, Paul H.3 phutton@mwdh2o.com |
| Source: | Journal of Hydrologic Engineering. Oct2015, Vol. 20 Issue 10, p1-17. 17p. |
| Subjects: | Evapotranspiration, Water supply research, Plant water requirements, Native plants, Hydrological research |
| Abstract: | Restoration activities in the Central Valley of California and elsewhere require accurate evapotranspiration information, which can then be used for a wide variety of surface and subsurface hydrologic evaluations. However, directly measuring evapotranspiration can be difficult or impossible depending on the evaluation's time frame. Transferability of measured evapotranspiration in time and space is also necessary but typically requires a weather-based reference. For nonagricultural vegetation, there is at present time no standard reference, which makes the evaluation of a variety of vegetation types from different sources difficult and time-consuming. This paper examines several methods used to estimate evapotranspiration from native vegetation, including the use of vegetation coefficients (Kv). Vegetation coefficients are based on a standardized reference and are computed as the ratio of vegetation evapotranspiration (ETv) to the grass reference evapotranspiration (ETo). These monthly Kv values are used to compute the long-term (for this study, 1922-2009) average ET[sub v] for vegetation types documented to exist in California's Central Valley prior to the arrival of the first European settlers in the mid-18th century. For vegetation that relies on precipitation and soil moisture storage, a calibrated daily soil-water balance with a dual crop coefficient approach was used to compute evapotranspiration regionally over the time frame. [ABSTRACT FROM AUTHOR] |
| Copyright of Journal of Hydrologic Engineering is the property of American Society of Civil Engineers and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 109546385 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Evapotranspiration from Natural Vegetation in the Central Valley of California: Monthly Grass Reference-Based Vegetation Coefficients and the Dual Crop Coefficient Approach. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Howes%2C+Daniel+J%2E%22">Howes, Daniel J.</searchLink><relatesTo>1</relatesTo><i> djhowes@calpoly.edu</i><br /><searchLink fieldCode="AR" term="%22Fox%2C+Phyllis%22">Fox, Phyllis</searchLink><relatesTo>2</relatesTo><i> phyllisfox@gmail.com</i><br /><searchLink fieldCode="AR" term="%22Hutton%2C+Paul+H%2E%22">Hutton, Paul H.</searchLink><relatesTo>3</relatesTo><i> phutton@mwdh2o.com</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+Hydrologic+Engineering%22">Journal of Hydrologic Engineering</searchLink>. Oct2015, Vol. 20 Issue 10, p1-17. 17p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Evapotranspiration%22">Evapotranspiration</searchLink><br /><searchLink fieldCode="DE" term="%22Water+supply+research%22">Water supply research</searchLink><br /><searchLink fieldCode="DE" term="%22Plant+water+requirements%22">Plant water requirements</searchLink><br /><searchLink fieldCode="DE" term="%22Native+plants%22">Native plants</searchLink><br /><searchLink fieldCode="DE" term="%22Hydrological+research%22">Hydrological research</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Restoration activities in the Central Valley of California and elsewhere require accurate evapotranspiration information, which can then be used for a wide variety of surface and subsurface hydrologic evaluations. However, directly measuring evapotranspiration can be difficult or impossible depending on the evaluation's time frame. Transferability of measured evapotranspiration in time and space is also necessary but typically requires a weather-based reference. For nonagricultural vegetation, there is at present time no standard reference, which makes the evaluation of a variety of vegetation types from different sources difficult and time-consuming. This paper examines several methods used to estimate evapotranspiration from native vegetation, including the use of vegetation coefficients (Kv). Vegetation coefficients are based on a standardized reference and are computed as the ratio of vegetation evapotranspiration (ETv) to the grass reference evapotranspiration (ETo). These monthly Kv values are used to compute the long-term (for this study, 1922-2009) average ET[sub v] for vegetation types documented to exist in California's Central Valley prior to the arrival of the first European settlers in the mid-18th century. For vegetation that relies on precipitation and soil moisture storage, a calibrated daily soil-water balance with a dual crop coefficient approach was used to compute evapotranspiration regionally over the time frame. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Journal of Hydrologic Engineering is the property of American Society of Civil Engineers and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1061/(ASCE)HE.1943-5584.0001162 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 17 StartPage: 1 Subjects: – SubjectFull: Evapotranspiration Type: general – SubjectFull: Water supply research Type: general – SubjectFull: Plant water requirements Type: general – SubjectFull: Native plants Type: general – SubjectFull: Hydrological research Type: general Titles: – TitleFull: Evapotranspiration from Natural Vegetation in the Central Valley of California: Monthly Grass Reference-Based Vegetation Coefficients and the Dual Crop Coefficient Approach. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Howes, Daniel J. – PersonEntity: Name: NameFull: Fox, Phyllis – PersonEntity: Name: NameFull: Hutton, Paul H. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 10 Text: Oct2015 Type: published Y: 2015 Identifiers: – Type: issn-print Value: 10840699 Numbering: – Type: volume Value: 20 – Type: issue Value: 10 Titles: – TitleFull: Journal of Hydrologic Engineering Type: main |
| ResultId | 1 |
