Soil water content on drip irrigated cotton: comparison of measured and simulated values obtained with the Hydrus 2-D model

Bufon, Vinicius Bof; Lascano, Robert J.; Bednarz, Craig W.; Booker, J. D.; Gitz, Dennis C.

doi:10.1007/s00271-011-0279-z

Cited by 58 publications

(28 citation statements)

References 35 publications

(38 reference statements)

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“…Overall, the changes in the simulated SWCs at 0-30 cm were more drastic than those at 30-90 cm in both irrigation treatments (Figures 11 and 12), since the 0-30 cm layer is more directly affected by irrigation, precipitation, evaporation, and transpiration [21,24]. The simulation results in Figures 11 and 12 showed that the HYDRUS-2D model overestimated the SWCs in July 2013.…”

Section: Modeling Soil Water Movement Under Different Irrigation Methodsmentioning

confidence: 62%

“…The HYDRUS-2D model and the dual crop coefficient approach of FAO-56 were calibrated using the measured data in 2014, and produced a cumulative bias under the extreme rainfall conditions in 2013. Nevertheless, the simulated and measured results in 2013 still exhibited highly consistent trends, with several consecutive irrigation and precipitation events in the transplanted cotton growing seasons, particularly considering the complexity of the conditions to which the model was applied (i.e., heterogeneous soil properties, a more than 120-day simulation period, high evaporative demand, and assumed constant root distribution in one growth stage) [21,24].…”

Section: Modeling Soil Water Movement Under Different Irrigation Methodsmentioning

confidence: 99%

“…In the SDI treatment, the left upper corner of the domain, which was 2.51 cm wide, was defined as the time-variable flux boundary to represent SDI. During irrigation, the fluxes of drip emitters were described in HYDRUS-2D as follows [18,21,23,25]:…”

Section: Water Flow Equationsmentioning

confidence: 99%

“…HYDRUS-2D is a hydrologic model that simulates water movements in two-and three-dimensional, variably-saturated porous media based on the numerical solution of the Richards equation [19,21,22,[24][25][26] and has been successfully used to model soil water movement under different irrigation methods, such as SDI, subsurface drip irrigation and flood irrigation [22,24,[27][28][29]. Previous simulation studies [19,21,22,24] have shown that the results for the soil water content (SWC) simulated by HYDRUS-2D are in reasonable agreement with measured values. Soil water movement associated with root water uptake is complex, and has been studied using empirical, analytical, and numerical models in the past decades.…”

Section: Introductionmentioning

confidence: 99%

“…The use of computer simulations with validated mathematical models is a rapid and inexpensive approach, which has received a great deal of attention during the past few decades [18][19][20][21][22][23][24][25]. HYDRUS-2D is a hydrologic model that simulates water movements in two-and three-dimensional, variably-saturated porous media based on the numerical solution of the Richards equation [19,21,22,[24][25][26] and has been successfully used to model soil water movement under different irrigation methods, such as SDI, subsurface drip irrigation and flood irrigation [22,24,[27][28][29]. Previous simulation studies [19,21,22,24] have shown that the results for the soil water content (SWC) simulated by HYDRUS-2D are in reasonable agreement with measured values.…”

Section: Introductionmentioning

confidence: 99%

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Root Development of Transplanted Cotton and Simulation of Soil Water Movement under Different Irrigation Methods

Zhang

Liu

Sun

et al. 2017

Water

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Abstract:Winter wheat and cotton are the main crops grown on the North China Plain (NCP). Cotton is often transplanted after the winter wheat harvest to solve the competition for cultivated land between winter wheat and cotton, and to ensure that both crops can be harvested on the NCP. However, the root system of transplanted cotton is distorted due to the restrictions of the seedling aperture disk before transplanting. Therefore, the investigation of the deformed root distribution and water uptake in transplanted cotton is essential for simulating soil water movement under different irrigation methods. Thus, a field experiment and a simulation study were conducted during 2013-2015 to explore the deformed roots of transplanted cotton and soil water movement using border irrigation (BI) and surface drip irrigation (SDI). The results showed that SDI was conducive to root growth in the shallow root zone (0-30 cm), and that BI was conducive to root growth in the deeper root zone (below 30 cm). SDI is well suited for producing the optimal soil water distribution pattern for the deformed root system of transplanted cotton, and the root system was more developed under SDI than under BI. Comparisons between experimental data and model simulations showed that the HYDRUS-2D model described the soil water content (SWC) under different irrigation methods well, with root mean square errors (RMSEs) of 0.023 and 0.029 cm 3 cm −3 and model efficiencies (EFs) of 0.68 and 0.59 for BI and SDI, respectively. Our findings will be very useful for designing an optimal irrigation plan for BI and SDI in transplanted cotton fields, and for promoting the wider use of this planting pattern for cotton transplantation.

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Section: Modeling Soil Water Movement Under Different Irrigation Methodsmentioning

confidence: 62%

Section: Modeling Soil Water Movement Under Different Irrigation Methodsmentioning

confidence: 99%

Section: Water Flow Equationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Root Development of Transplanted Cotton and Simulation of Soil Water Movement under Different Irrigation Methods

Zhang

Liu

Sun

et al. 2017

Water

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Spatial and diurnal below canopy evaporation in a desert vineyard: Measurements and modeling

Kool

Ben‐Gal

Agam

et al. 2014

Water Resources Research

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Evaporation from the soil surface (E) can be a significant source of water loss in arid areas. In sparsely vegetated systems, E is expected to be a function of soil, climate, irrigation regime, precipitation patterns, and plant canopy development and will therefore change dynamically at both daily and seasonal time scales. The objectives of this research were to quantify E in an isolated, drip-irrigated vineyard in an arid environment and to simulate below canopy E using the HYDRUS (2-D/3-D) model. Specific focus was on variations of E both temporally and spatially across the inter-row. Continuous above canopy measurements, made in a commercial vineyard, included evapotranspiration, solar radiation, air temperature and humidity, and wind speed and direction. Short-term intensive measurements below the canopy included actual and potential E and solar radiation along transects between adjacent vine-rows. Potential and actual E below the canopy were highly variable, both diurnally and with distance from the vine-row, as a result of shading and distinct wetted areas typical to drip irrigation. While the magnitude of actual E was mostly determined by soil water content, diurnal patterns depended strongly on position relative to the vine-row due to variable shading patterns. HYDRUS (2-D/3-D) successfully simulated the magnitude, diurnal patterns, and spatial distribution of E, including expected deviations as a result of variability in soil saturated hydraulic conductivity.

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How soil texture, channel shape and cross‐sectional area affect moisture dynamics and water loss in irrigation channels

Liu

et al. 2021

Hydrological Processes

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To enhance the utilization efficiency of farmland irrigation water and reduce the leakage of water conveyance channels, the leakage process of channels was simulated dynamically. The simulated results were compared with data measured in laboratory experiments, and the performance of the model was evaluated. The results indicated that the simulated values of the model were consistent with the observation values, and the R 2 values varied between 0.91 and 0.99. In addition, based on the laboratory experiments, a water supply system (Mariotte bottles) and soil box were built using plexiglass. Three influencing factors, namely, the channel form, soil texture and channel cross-sectional area, were varied to observe and calculate the resulting cumulative infiltration amount, infiltration rate and wetting front migration distance. HYDRUS-3D software was used to solve the three-dimensional soil water movement equation under different initial conditions. The results demonstrated that the Ushaped channel was more effective than the trapezoidal channel in increasing the utilization efficiency of the water resources. A U-shaped channel with a small channel cross-sectional area should be adopted and the soil particle size should be prioritized in the construction of water conveyance channels for farmlands. The simulation results were in agreement with the observed results, which indicates that HYDRUS-3D is a reliable tool that can accurately simulate the soil moisture movement in water conveyance channels. The research results can provide a reference for the design and operation of farmland irrigation systems.

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Soil water content on drip irrigated cotton: comparison of measured and simulated values obtained with the Hydrus 2-D model

Cited by 58 publications

References 35 publications

Root Development of Transplanted Cotton and Simulation of Soil Water Movement under Different Irrigation Methods

Root Development of Transplanted Cotton and Simulation of Soil Water Movement under Different Irrigation Methods

Spatial and diurnal below canopy evaporation in a desert vineyard: Measurements and modeling

How soil texture, channel shape and cross‐sectional area affect moisture dynamics and water loss in irrigation channels

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