Evapotranspiration from the Lower Walker River Basin, West-Central Nevada, Water Years 2005-07

Allander, Kip K.; Smith, J. LaRue; Johnson, Michael J.

doi:10.3133/sir20095079

Cited by 15 publications

(19 citation statements)

References 44 publications

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“…() was not detailed. However, to have similar spatial scales for the measured and estimated ET, and given that 80% of the turbulent fluxes are likely derived from within 100 m of the flux sites used in this study (Moreo et al ., ; Allander et al ., ), METRIC ET estimates were averaged for circular footprints with a radius of 100 m for all sites. In addition, this fetch area was selected to ensure that ET estimates and measurements were only for the same field while maximizing the number of sampled pixels.…”

Section: Methodsmentioning

confidence: 99%

“…Bowen ratio ET data were collected in Mason Valley by Allander et al . () at two sites for 2005 and 2006. Sites B01 and B11 were located near the middle of flood‐irrigated alfalfa fields, however, site B01 was only irrigated in 2005 and was fallow in 2006.…”

Section: Datamentioning

confidence: 99%

“…() and Allander et al . (), the estimated ET values were not used for this study and those dates were excluded from the daily and seasonal ET comparisons.…”

Section: Datamentioning

confidence: 99%

See 2 more Smart Citations

Assessing Calibration Uncertainty and Automation for Estimating Evapotranspiration from Agricultural Areas Using METRIC

Morton

Huntington

Pohll

et al. 2013

J American Water Resour Assoc

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Agricultural irrigation accounts for a large fraction of the total water use in the western United States. The Mapping Evapotranspiration at high Resolution with Internalized Calibration (METRIC) remote sensing energy balance model is being used to estimate historical agricultural water use in western Nevada to evaluate basin-wide water budgets. Each METRIC evapotranspiration (ET) estimate must be calibrated by a trained user, which requires some iterative time investment and results in variation in ET estimates between users. An automated calibration algorithm for the METRIC model was designed to generate ET estimates comparable to those from trained users by mimicking the manual calibration process. Automated calibration allows for rapid generation of METRIC ET estimates with minimal manual intervention, as well as uncertainty and sensitivity analysis of the model. The variation in ET estimates generated by the automated calibration algorithm was found to be similar to the variation in manual ET estimates. Results indicate that uncertainty was highest for fields with low ET levels and lowest for fields with high ET levels, with a seasonal mean uncertainty of approximately 5% for all fields. In addition, in a blind comparison, automated daily and seasonal ET estimates compared well with flux tower measurement ET data at multiple sites. Automated methods can generate first-order ET estimates that are similar to time intensive manual efforts with less time investment.(KEY TERMS: evapotranspiration; uncertainty analysis; remote sensing; surface energy balance.)

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Section: Methodsmentioning

confidence: 99%

Section: Datamentioning

confidence: 99%

See 1 more Smart Citation

Assessing Calibration Uncertainty and Automation for Estimating Evapotranspiration from Agricultural Areas Using METRIC

Morton

Huntington

Pohll

et al. 2013

J American Water Resour Assoc

View full text Add to dashboard Cite

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“…Depth to groundwater at the study sites ranged from 0 to 10 m below land surface. Micrometeorological stations at the study sites consisted of EC and/or BR towers operated and maintained by the U.S. Geological Survey (USGS) and Desert Research Institute (DRI) (Reiner et al ., ; Maurer et al., ; Moreo et al ., ; DeMeo et al ., ; Allander et al ., ; Arnone et al ., ). Station data were chosen based on the quality and criteria that each site had at least one full year of ET a , PPT, and meteorological data to compute ET o .…”

Section: Study Sites and Meteorological Datamentioning

confidence: 96%

“…Because most valley floor areas in the Great Basin are fairly large in size, uncertainty in the estimated ET g rate from phreatophyte areas leads to a large uncertainty in the overall water budget, especially the groundwater budget (Nichols, ). Many recent studies have assessed ET g rates of phreatophyte communities in the Great Basin using micrometeorological, energy balance, and remote sensing techniques (Laczniak et al ., ; Reiner et al ., ; Harrington et al ., ; Maurer et al ., ; Steinwand et al ., ; Groeneveld et al ., ; Moreo et al ., ; DeMeo et al ., ; Allander et al ., ; Devitt et al., 2011; Huntington et al ., ). Relating flux tower estimates of ET to space‐borne remote sensing data (e.g., Landsat, MODIS) allows for spatial scaling of ET to the entire HA.…”

Section: Introductionmentioning

confidence: 99%

Estimating Annual Groundwater Evapotranspiration from Phreatophytes in the Great Basin Using Landsat and Flux Tower Measurements

Beamer

Huntington

Morton

et al. 2013

J American Water Resour Assoc

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Escalating concerns about water supplies in the Great Basin have prompted numerous water budget studies focused on groundwater recharge and discharge. For many hydrographic areas (HAs) in the Great Basin, most of the recharge is discharged by bare soil evaporation and evapotranspiration (ET) from phreatophyte vegetation. Estimating recharge from precipitation in a given HA is difficult and often has significant uncertainty, therefore it is often quantified by estimating the natural discharge. As such, remote sensing applications for spatially distributing flux tower estimates of ET and groundwater ET (ET g ) across phreatophyte areas are becoming more common. We build on previous studies and develop a transferable empirical relationship with uncertainty bounds between flux tower estimates of ET and a remotely sensed vegetation index, Enhanced Vegetation Index (EVI). Energy balance-corrected ET measured from 40 flux tower site-year combinations in the Great Basin was statistically correlated with EVI derived from Landsat imagery (r 2 = 0.97). Application of the relationship to estimate mean-annual ET g from four HAs in western and eastern Nevada is highlighted and results are compared with previous estimates. Uncertainty bounds about the estimated mean ET g allow investigators to evaluate if independent groundwater discharge estimates are "believable" and will ultimately assist local, state, and federal agencies to evaluate expert witness reports of ET g , along with providing new first-order estimates of ET g .

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Defoliation effects of Diorhabda carinulata on tamarisk evapotranspiration and groundwater levels

et al. 2015

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Diorhabda carinulata (northern tamarisk beetle) has been released in the western United States as a biological control agent for the invasive plant Tamarix spp. (tamarisk). A few studies have been conducted analysing the effects of beetle defoliation on tamarisk water consumption, but predefoliation and post‐defoliation comparison based on field data is scarce. The question of whether beetles substantially alter tamarisk water consumption is still open for discussion. In this study, an eddy covariance station and groundwater monitoring well were installed in a tamarisk stand along the Virgin River near Mesquite, NV, in 2010 to observe the impacts of tamarisk defoliation on evapotranspiration (ET) and groundwater levels. ET was calculated using the eddy covariance method and the White method and supported by Landsat remote sensing estimates. Data collected in 2010 established a baseline since the beetles arrived at the site in late 2010 and started feeding on foliage causing tamarisk trees to turn to brown during 2011. Repeated defoliations in 2011 and 2012 show that post‐defoliation ET values and magnitude of diurnal groundwater‐level fluctuations decreased compared with the predefoliation values. Estimated annual ET and annual average daily groundwater fluctuations were reduced by 18% and 35%, respectively. However, the magnitude of effects of defoliation was dependent on the growth stage of tamarisk at the time of defoliation. Also, ET recovered within a month as tamarisk established new leaves. Results from this study suggest that long‐term changes in ET are highly dependent on repeated defoliation occurrences over several years. Copyright © 2015 John Wiley & Sons, Ltd.

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Evapotranspiration from the Lower Walker River Basin, West-Central Nevada, Water Years 2005-07

Cited by 15 publications

References 44 publications

Assessing Calibration Uncertainty and Automation for Estimating Evapotranspiration from Agricultural Areas Using METRIC

Assessing Calibration Uncertainty and Automation for Estimating Evapotranspiration from Agricultural Areas Using METRIC

Estimating Annual Groundwater Evapotranspiration from Phreatophytes in the Great Basin Using Landsat and Flux Tower Measurements

Defoliation effects of Diorhabda carinulata on tamarisk evapotranspiration and groundwater levels

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