Mathematical modelling technique to mitigate soil moisture measurement inaccuracies under the conditions of drip irrigation

Bohaienko, Vsevolod; Romashchenko, Mykhailo; Sardak, Anastasiia; Gladky, Anatolii

doi:10.1007/s00271-022-00835-6

Cited by 2 publications

(6 citation statements)

References 34 publications

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“…For the purpose of modelling, we used the Richards equation [6] stated in terms of water head in a two-dimensional approximation, similar to that presented in [20]:…”

Section: Methodsmentioning

confidence: 99%

“…The forms of boundary conditions are given in [20]. They include only gravitational flow condition ∂H ∂z = 0 on the bottom of the domain; symmetric flow conditions ∂H ∂x = 0 on its left and right side; and the condition of flux-controlled interaction with the atmosphere on the upper side.…”

Section: Methodsmentioning

confidence: 99%

“…where Q e (t), Q p (t) are the fluxes, m/s, of evaporation and precipitation. The function S models the extraction of moisture by the root systems of plants the way it is described in [20]. The distribution of transpiration along the depth z is described according to [22] in the form…”

Section: Methodsmentioning

confidence: 99%

“…In order to take into account the crop coefficient, evapotranspiration estimation errors and, in general, to adapt the model to the actual growing and soil conditions, a multiplier k ET is introduced to the model [20]; yielding the following representation of evapotranspiration: ET = k ET ET ′ where ET ′ is the value of potential evapotranspiration. A similar multiplier k prec is also introduced for the amount of precipitation, to account for possible errors of measurement and boundary condition discretization:…”

Section: Methodsmentioning

confidence: 99%

“…The simulation domain is shown in Figure 3. Initial water head distribution H 0 was calculated by iterative smoothing its values with fixed known initial pressures obtained from sensors in given points of the simulation domain [20].…”

Section: Methodsmentioning

confidence: 99%

See 4 more Smart Citations

Simulation-Based Assessment of Subsurface Drip Irrigation Efficiency for Crops Grown in Raised Beds

Bohaienko,

Romashchenko,

Shatkovskyi

et al. 2024

Eng

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This paper considers the application of a scenario simulation technique to assess subsurface drip irrigation system efficiency while using it to irrigate crops grown under raised bed technology. For simulating purposes, we use a model based on the two-dimensional Richards equation stated in terms of water head in a curvilinear domain. Solutions to problems are obtained using a finite-difference scheme with dynamic time step change. Using the data from pressure measurements obtained while growing potatoes on sandy loess soil in production conditions, we performed a calibration of the model using the particle swarm optimization algorithm. Further, the accuracy of the model was tested and average absolute errors in the range from 3.16 to 5.29 kPa were obtained. Having a calibrated model, we performed a series of simulations with different irrigation pipeline placements determining the configuration under which water losses are minimal. The simulated configuration, under which infiltration losses were minimal, was the installation of pipelines under the raised bed at the depth of 10 cm below the soil surface. The results confirm that the applied technique can be used for decision-making support while designing subsurface drip irrigation systems combined with raised bed growing technology.

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“…For the purpose of modelling, we used the Richards equation [6] stated in terms of water head in a two-dimensional approximation, similar to that presented in [20]:…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 3 more Smart Citations

Simulation-Based Assessment of Subsurface Drip Irrigation Efficiency for Crops Grown in Raised Beds

Bohaienko,

Romashchenko,

Shatkovskyi

et al. 2024

Eng

Self Cite

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Simulation of irrigation in southern Ukraine incorporating soil moisture state in evapotranspiration assessments

Bohaienko

Matіash²,

Romashchenko³

2023

EJSS

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The paper studies the accuracy of modeling moisture transport under the conditions of sprinkler irrigation using evapotranspiration assessment methods that take into account the soil moisture conditions. Appropriate modifications of the Penman-Monteith and the Priestley-Taylor models are considered. Moisture transport modeling is performed using the Richards equation in its integer- and fractional-order forms. Parameters identification is performed by the particle swarm optimization algorithm based on the readings of suction pressure sensors. Results for the two periods of 11 and 50 days demonstrate the possibility of up to ~20% increase in the simulation accuracy by using a modified Priestley-Taylor model when the maintained range of moisture content in the root layer is 70%-100% of field capacity. When irrigation maintained the range of 80%-100% of field capacity, moisture content consideration within evapotranspiration assessment models did not enhance simulation accuracy. This confirms the independence of evapotranspiration from soil moisture content at its levels above 80% of field capacity as in this case actual evapotranspiration reaches a level close to the potential one. Scenario modeling of the entire growing season with the subsequent estimation of crop (maize) yield showed that irrigation regimes generated using evapotranspiration models, which take into account soil moisture data, potentially provide higher yields at lower water supply.

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Mathematical modelling technique to mitigate soil moisture measurement inaccuracies under the conditions of drip irrigation

Cited by 2 publications

References 34 publications

Simulation-Based Assessment of Subsurface Drip Irrigation Efficiency for Crops Grown in Raised Beds

Simulation-Based Assessment of Subsurface Drip Irrigation Efficiency for Crops Grown in Raised Beds

Simulation of irrigation in southern Ukraine incorporating soil moisture state in evapotranspiration assessments

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