Effect of removal of <i>Juniperus ashei</i> on evapotranspiration and runoff in the Seco Creek Watershed

Dugas, William A.; Hicks, R. A.; Wright, P.

doi:10.1029/98wr00556

Cited by 76 publications

(89 citation statements)

References 34 publications

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“…Baker found an increase in annual stream flow of 157% in the first 2 years posttreatment, which was apparent but not statistically significant 8 years posttreatment. Fourth, Dugas et al (1998) documented a direct reduction in evapotranspiration by removing Ashe juniper (Juniperus ashei) cover on central Texas plots that were 0.6 square mile (1.5 square kilometers) with annual precipitation averaging 26.5 inches (67.3 centimeters). In this study, juniper removal caused an overall decrease in evapotranspiration by only 0.003 inch (0.07 millimeter) per day.…”

Section: Conversion and Water Yieldmentioning

confidence: 99%

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Juniper removal may not increase overall Klamath River Basin water yields

Kuhn¹,

Tate²,

Cao³

et al. 2007

Cal Ag

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Section: Conversion and Water Yieldmentioning

confidence: 99%

“…Hibbert recommended following juniper removal with the active seeding of grasses or other low-water-use vegetation. Dugas et al (1998) suggested grazing treated sites to further limit the evapotranspiration demands from herbaceous plants.…”

Section: Conversion and Water Yieldmentioning

confidence: 99%

Juniper removal may not increase overall Klamath River Basin water yields

Kuhn¹,

Tate²,

Cao³

et al. 2007

Cal Ag

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“…The position of the water table affects soil moisture and the availability of water to plants and therefore is directly related to latent and sensible heat fluxes to the atmosphere (e.g. [15,17]) (Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

Putting aquifers into atmospheric simulation models: an example from the Mill Creek Watershed, northeastern Kansas

York

Person

Gutowski

et al. 2002

Advances in Water Resources

168

144

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Aquifer-atmosphere interactions can be important in regions where the water table is shallow (<2 >m). A shallow water table provides moisture for the soil and vegetation and thus acts as a source term for evapotranspiration to the atmosphere. A coupled aquifer-land surface-atmosphere model has been developed to study aquifer-atmosphere interactions in watersheds, on decadal timescales. A single column vertically discretized atmospheric model is linked to a distributed soil-vegetation-aquifer model. This physically based model was able to reproduce monthly and yearly trends in precipitation, stream discharge, and evapotranspiration, for a catchment in northeastern Kansas. However, the calculated soil moisture tended to drop to levels lower than were observed in drier years. The evapotranspiration varies spatially and seasonally and was highest in cells situated in topographic depressions where the water table is in the root zone. Annually, simulation results indicate that from 5-20% of groundwater supported evapotranspiration is drawn from the aquifer. The groundwater supported fraction of evapotranspiration is higher in drier years, when evapotranspiration exceeds precipitation. A long-term (40 year) simulation of extended drought conditions indicated that water table position is a function of groundwater hydrodynamics and cannot be predicted solely on the basis of topography. The response time of the aquifer to drought conditions was on the order of 200 years indicating that feedbacks between these two water reservoirs act on disparate time scales. With recent advances in the computational power of massively parallel supercomputers, it may soon become possible to incorporate physically based representations of aquifer hydrodynamics into general circulation models (GCM) land surface parameterization schemes. RightsWorks produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted. AbstractAquifer-atmosphere interactions can be important in regions where the water table is shallow (<2 m). A shallow water table provides moisture for the soil and vegetation and thus acts as a source term for evapotranspiration to the atmosphere. A coupled aquifer-land surface-atmosphere model has been developed to study aquifer-atmosphere interactions in watersheds, on decadal timescales. A single column vertically discretized atmospheric model is linked to a distributed soil-vegetation-aquifer model. This physically based model was able to reproduce monthly and yearly trends in precipitation, stream discharge, and evapotranspiration, for a catchment in northeastern Kansas. However, the calculated soil moisture tended to drop to levels lower than were observed in drier years. The evapotranspiration varies spatially and seasonally and was highest in cells situated in topographic depressions where the water table is in the root zone. Annually, simulation results indicate that from 5-20% of groundwater supported evapotranspir...

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“…If lysimeters are not available, the Bowen ratio method is often used as an alternative to lysimetric measurements (Moran et al, 1989;Kustas et al, 1999;Devitt et al, 1998;Dugas et al, 1998;Prueger et al, 1997;Cellier and Olioso, 1993).…”

Section: Abstract For a Variety Of Reasons The Measurement Of Latenmentioning

confidence: 99%

Guidelines for Validating Bowen Ratio Data

Payero¹,

Neale²,

Wright³

et al. 2003

Transactions of the ASAE

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ABSTRACT. For a variety of reasons, the measurement of latent heat flux using the Bowen ratio method can sometimes result in erroneous data. This study provides guidelines for detecting erroneous Bowen ratio data and illustrates the application of these guidelines by comparingvapotranspiration (ET) from a surface can either be measured or estimated. Because measuring ET is difficult and requires specialized equipment, most applications use ET estimates instead of direct measurements. ET can be estimated from meteorological, crop, and soil information using a variety of methods, as reviewed by Doorenbos and Pruitt (1977), Jensen et al. (1990), andAllen et al. (1998). However, for some applications, especially in research, direct measurement of ET is necessary.For decades, precision weighing lysimeters have been the standard for the direct measurement of ET. If lysimeters are not available, the Bowen ratio method is often used as an alternative to lysimetric measurements (Moran et al., 1989;Kustas et al., 1999;Devitt et al., 1998;Dugas et al., 1998;Prueger et al., 1997;Cellier and Olioso, 1993).Although the theory for this method has been known for a long time (Bowen, 1926), its practical application has only been possible in recent decades, as adequate instrumentation has been developed. This method is based on the theory that one-dimensional fluxes of sensible and latent heat can be described in terms of flux-gradient relationships (Tanner, 1988): Substituting equations 1 and 2 into equation 3, and assuming K h = K w (Verma et al., 1978;Cellier and Brunet, 1992), b can be obtained from (Bowen, 1926):where g = (C p P/el) is the psychrometric constant (kPa °C -1 ), and DT and De are obtained by measuring air temperature and vapor pressure or dew point at two heights above the top of the canopy, within the boundary layer. The one-dimensional surface energy balance equation is as follows:where R n = net radiation (W m -2 ) G = soil heat flux (W m -2 ). E

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Effect of removal of Juniperus ashei on evapotranspiration and runoff in the Seco Creek Watershed

Cited by 76 publications

References 34 publications

Juniper removal may not increase overall Klamath River Basin water yields

Juniper removal may not increase overall Klamath River Basin water yields

Putting aquifers into atmospheric simulation models: an example from the Mill Creek Watershed, northeastern Kansas

Guidelines for Validating Bowen Ratio Data

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