Micrometeorology of sprinkler irrigation

Hancock, Nicola; Uddin, Muhammad Jasim; Smith, Rod; Foley, Joseph

doi:10.1016/j.agrformet.2014.10.010

Cited by 8 publications

(5 citation statements)

References 21 publications

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“…As reported by many authors (e.g. Van der Tol et al ., ; Tolk et al ., ; Hancock et al ., ), advection can play a significant role in the EB over large inhomogeneous surfaces. Hence, the presence of advection, as the combined effects of temperature, vapour pressure deficit, available energy and wind speed was identified using the Advection Index ( AI ) modified from Todd et al .…”

Section: Experimental Methodsmentioning

confidence: 99%

“…Hancock et al . () showed that for an irrigated closed canopy crop (such as the cotton crop) many of the terms are either negligible or cancelled, and so Equation becomes:

λ E = R_{n} - H - D_{V} + D_{H}

…”

Section: Experimental Methodsmentioning

confidence: 99%

“…The experiments and the data collected are common with those used in previous papers by the authors (Uddin et al ., & b, Hancock et al ., ). The particular data sets used in this paper were taken during irrigations applied to a mature (closed canopy) cotton crop.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…The latent heat flux λE was deduced from the surface energy balance over the irrigated cotton crop by measuring or otherwise estimating all terms of energy transfer into and out of a control volume (Hancock et al ., ) as:

λ E = R_{n} - H + D_{H} - D_{V} - G - J - normalμ A + Q

where R n is the net radiation, H is the sensible heat flux, D H is the net sensible heat added horizontally by advection, D V is the net latent heat removed horizontally by advection, G is the soil heat flux, J is the flux of energy into physical storage, μA is the flux of energy consumed in biochemical processes and Q is the energy applied with the irrigation water. All the terms are in unit W m −2 .…”

Section: Experimental Methodsmentioning

confidence: 99%

“…() and Czikowsky and Fitzjarrald () opposed this assumption. Additionally, in the usual form of the P–M equation advected energy is not accounted for in the energy balance, thus underestimating the wet canopy evaporation (Hutjes et al ., ; Schellekens et al ., ; Van der Tol et al ., ; Hancock et al ., ).…”

Section: Introductionmentioning

confidence: 99%

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A new approach to estimate canopy evaporation and canopy interception capacity from evapotranspiration and sap flow measurements during and following wetting

et al. 2015

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Canopy interception and its evaporation into the atmosphere during irrigation or a rainfall event are important in irrigation scheduling, but are challenging to estimate using conventional methods. This study introduces a new approach to estimate the canopy interception from measurements of actual total evapotranspiration (ET) using eddy covariance and estimation of the transpiration from measurements of sap flow. The measurements were conducted over a small‐scale sprinkler‐irrigated cotton field before, during and after sprinkler irrigation. Evaporation and sap flow dynamics during irrigation show that the total ET during irrigation increased significantly because of the evaporation of free intercepted water while transpiration was suppressed almost completely. The difference between actual ET and transpiration (sap flow) during and immediately following irrigation (post irrigation) represents the total canopy evaporation while the canopy interception capacity was calculated as the difference between actual ET and transpiration (sap flow) during drying (post irrigation) following cessation of the irrigation. The canopy evaporation of cotton canopy was calculated as 0.8 mm, and the interception capacity was estimated to be 0.31 mm of water. The measurement uncertainty in both the non‐dimensional ET and non‐dimensional sap flow was shown to be very low. Copyright © 2015 John Wiley & Sons, Ltd.

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Section: Experimental Methodsmentioning

confidence: 99%

“…Hancock et al . () showed that for an irrigated closed canopy crop (such as the cotton crop) many of the terms are either negligible or cancelled, and so Equation becomes: