Assessment of water balance simulations for large-scale weighing lysimeters

Loos, C.; Gayler, Sebastian; Priesack, Eckart

doi:10.1016/j.jhydrol.2006.11.017

Cited by 37 publications

(31 citation statements)

References 39 publications

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“…Accurate estimates of evapotranspiration are also needed as upper boundary condition for the application of deterministic models to simulate soil water and element fluxes of agricultural and forest ecosystems (e.g. Ficklin et al, 2010;Loos et al, 2007;Luo and Sophocleus, 2010;Soylu et al, 2011). Despite some progress in research and instrumentation, rates of ETr are still difficult to determine experimentally (e.g.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of real evapotranspiration measured by weighing lysimeters with simulations based on the Penman formula and a crop growth model

Wegehenkel¹,

Gerke²

2013

Journal of Hydrology and Hydromechanics

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Although the quantification of real evapotranspiration (ETr) is a prerequisite for an appropriate estimation of the water balance, precision and uncertainty of such a quantification are often unknown. In our study, we tested a combined growth and soil water balance model for analysing the temporal dynamics of ETr. Simulated ETr, soil water storage and drainage rates were compared with those measured by 8 grass-covered weighable lysimeters for a 3-year period (January 1, 1996 to December 31, 1998). For the simulations, a soil water balance model based on the Darcy-equation and a physiological-based growth model for grass cover for the calculation of root water uptake were used. Four lysimeters represented undisturbed sandy soil monoliths and the other four were undisturbed silty-clay soil monoliths. The simulated ETr-rates underestimated the higher ETr-rates observed in the summer periods. For some periods in early and late summer, the results were indicative for oasis effects with lysimeter-measured ETr-rates higher than corresponding calculated rates of potential grass reference evapotranspiration. Despite discrepancies between simulated and observed lysimeter drainage, the simulation quality for ETr and soil water storage was sufficient in terms of the Nash-Sutcliffe index, the modelling efficiency index, and the root mean squared error. The use of a physiological-based growth model improved the ETr estimations significantly.

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Section: Introductionmentioning

confidence: 99%

“…Weighable lysimeters measure changes in soil water storage and drainage, which enable the determination of ETr under defined bottom boundary conditions (e.g. Castelvi and Snyder, 2010;Herbst et al, 2005;Loos et al, 2007). In addition to direct measurements, estimation of ETr-rates can be complemented by deterministic modelling approaches.…”

Section: Introductionmentioning

confidence: 99%

Comparison of real evapotranspiration measured by weighing lysimeters with simulations based on the Penman formula and a crop growth model

Wegehenkel¹,

Gerke²

2013

Journal of Hydrology and Hydromechanics

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“…The major drawback of the design as compared to mechanic designs is that the entire dead load (soil, container and crop) and live load of the tank are measured. Some lysimeters using load cells are described by McFarland et al (1983), Schneider et al (1998), Tyagi et al (2000Tyagi et al ( , 2003, Barani & Khanjani (2002), Girona et al (2004), Jia et al (2006), Loos et al (2007), and Payero & Irmak (2008).…”

Section: Field Characteristicsmentioning

confidence: 99%

“…Evaporation from bare soil is important to establish a water balance (Loos et al, 2007). Here, E from soil was measured during autumn/winter at a time when there was no transpiration from the almond tree.…”

Section: Evapotranspiration Of a Young Almond Treementioning

confidence: 99%

Design and construction of a large weighing lysimeter in an almond orchard

Lorite

Santos

Testi

et al. 2012

Span. j. agric. res.

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Effective water management is essential to ensure the sustainability of irrigated agriculture. The accurate determination of crop water requirements is the first step in this task. This paper describes the building of a one-tree weighing lysimeter (3m x 3m and 2.15m depth) located in an almond orchard (Prunus dulcis “Guara”), inside the experimental farm “Alameda del Obispo” in Córdoba, Spain, to measure orchard evapotranspiration (ETc). Following a review on lysimetry, the description of the construction of the weighing lysimeter is provided in detail, including considerations relative to system resolution and wind effects on the measurements. Finally, some preliminary results of the evaporation and transpiration of young almond trees are presented demonstrating that lysimetry in orchards provides accurate ET values needed to determine irrigation water requirements.

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“…Based on the measured daily precipitation, the estimation of daily potential evapotranspiration by the Penman-Monteith dual crop coefficient method (Allen 2000;Loos et al 2007;Gayler et al 2009) and the partitioning of potential evaporation and potential transpiration according to Allen (2000), the daily actual evapotranspiration, the daily changes in water storage and the daily percolation rates were simulated and compared to the corresponding measurements (Fig. 8).…”

Section: Numerical Accuracy and Convergencementioning

confidence: 99%

A one-dimensional model of water flow in soil-plant systems based on plant architecture

et al. 2010

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The estimation of root water uptake and water flow in plants is crucial to quantify transpiration and hence the water exchange between land surface and atmosphere. In particular the soil water extraction by plant roots which provides the water supply of plants is a highly dynamic and non-linear process interacting with soil transport processes that are mainly determined by the natural soil variability at different scales. To better consider this root-soil interaction we extended and further developed a finite element tree hydrodynamics model based on the one-dimensional (1D) porous media equation. This is achieved by including in addition to the explicit three- dimensional (3D) architectural representation of the tree crown a corresponding 3D characterisation of the root system. This 1D xylem water flow model was then coupled to a soil water flow model derived also from the 1D porous media equation. We apply the new model to conduct sensitivity analysis of root water uptake and transpiration dynamics and compare the results to simulation results obtained by using a 3D model of soil water flow and root water uptake. Based on data from lysimeter experiments with young European beech trees (Fagus silvatica L.) is shown, that the model is able to correctly describe transpiration and soil water flow. In conclusion, compared to a fully 3D model the 1D porous media approach provides a computationally efficient alternative, able to reproduce the main mechanisms of plant hydro-dynamics including root water uptake from soil.

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Assessment of water balance simulations for large-scale weighing lysimeters

Cited by 37 publications

References 39 publications

Comparison of real evapotranspiration measured by weighing lysimeters with simulations based on the Penman formula and a crop growth model

Comparison of real evapotranspiration measured by weighing lysimeters with simulations based on the Penman formula and a crop growth model

Design and construction of a large weighing lysimeter in an almond orchard

A one-dimensional model of water flow in soil-plant systems based on plant architecture

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