Modeling paddy field subsurface drainage using HYDRUS-2D

Ebrahimian, Hamed; Noory, Hamideh

doi:10.1007/s10333-014-0465-8

Cited by 29 publications

(11 citation statements)

References 12 publications

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“…Boundaries of the soil pit that fell below the highest water level reached during the SRT were designated as having "variable head" conditions. The remaining side walls were designated as "seepage faces", because the pits were surrounded by gravel subject to atmospheric pressure [31]. No flow was assumed at the top boundary.…”

Section: Hydrological Modelingmentioning

confidence: 99%

When Green Infrastructure Turns Grey: Plant Water Stress as a Consequence of Overdesign in a Tree Trench System

Caplan

Eisenman

et al. 2020

Water

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Green infrastructure (GI) systems are often overdesigned. This may be a byproduct of static sizing (e.g., accounting for a design storm’s runoff volume but not exfiltration rates) or may be deliberate (e.g., buffering against performance loss through time). In tree trenches and other GI systems that require stormwater to accumulate in an infiltration bed before it contacts the planting medium, overdesign could reduce plant water availability significantly. This study investigated the hydrological dynamics and water relations of an overdesigned tree trench system and identified factors contributing to, compounding, and mitigating the risk of plant stress. Water in the infiltration bed reached soil pits only once in three years, with that event occurring during a hydrant release. Moreover, minimal water was retained in soil pits during the event due to the hydraulic properties of the soil media. Through a growing season, one of the two tree types frequently experienced water stress, while the other did so only rarely. These contrasting responses can likely be attributed to roots being largely confined to the soil pits vs. reaching a deeper water source, respectively. Results of this study demonstrate that, in systems where soil pits are embedded in infiltration beds, overdesign can raise the storm size required for water to reach the soil media, reducing plant water availability between storms, and ultimately inducing physiological stress.

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Section: Hydrological Modelingmentioning

confidence: 99%

When Green Infrastructure Turns Grey: Plant Water Stress as a Consequence of Overdesign in a Tree Trench System

Caplan

Eisenman

et al. 2020

Water

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“…In the model, all boundaries below the elevation corresponding to the highest water level reached (which occurred during the SRT) were designated as having "variable head" conditions. The remaining side walls were designated as "seepage faces" because the pits were surrounded by gravel subject to atmospheric pressure [31]. No flow was assumed at the top boundary.…”

Section: Hydrological Modelingmentioning

confidence: 99%

When Green Infrastructure Turns Grey: Implications of Overdesign on Plant Water Stress

Tu¹,

Caplan²,

Eisenman³

et al. 2020

Preprint

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Green infrastructure systems are often overdesigned. This may be a byproduct of static sizing (e.g., accounting for a design storm’s runoff volume but not exfiltration rates) or may be deliberate (e.g., buffering against performance loss through time). Regardless, overdesign may compromise plants’ access to water in systems where soil pits are embedded in infiltration beds. It could raise the storm size required for water to reach soil pits, reducing water availability between storms, which could ultimately induce plant physiological stress. This study investigated the hydrological dynamics and water relations of a tree trench system suspected to have been overbuilt and identified factors contributing to, compounding, and mitigating the risk of plant stress. Results provided strong evidence that the abovementioned processes played out. Water in the infiltration bed reached soil pits only once in three years, with that event occurring during a hydrant release. Moreover, minimal water was retained in the soil pit during the event due to the hydraulic properties of the soil media. Through a growing season, one of the two tree types frequently experienced water stress, while the other did so only rarely. These contrasting responses can likely be attributed to roots either being largely confined to the soil pits or reaching a deeper water source. Implications of these results for green infrastructure design are considered.

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“…Due to the presence of a hard pan below the plough layer (Darzi-Naftchali et al, 2018) and consequently a different flow pattern to subsurface drains (Ebrahimian and Noory, 2015), the effects of such practices are more complex in paddy soils compared to ordinary fields. Due to the presence of a hard pan below the plough layer (Darzi-Naftchali et al, 2018) and consequently a different flow pattern to subsurface drains (Ebrahimian and Noory, 2015), the effects of such practices are more complex in paddy soils compared to ordinary fields.…”

Section: Introductionmentioning

confidence: 99%

“…In addition to drainage design criteria, soil characteristics and water management practices have an influence on drainage water salinity. Due to the presence of a hard pan below the plough layer (Darzi-Naftchali et al, 2018) and consequently a different flow pattern to subsurface drains (Ebrahimian and Noory, 2015), the effects of such practices are more complex in paddy soils compared to ordinary fields. Simulation models can quickly and cost-effectively describe such complex behaviour of subsurface-drained paddy soils if accurately calibrated and validated.…”

Section: Introductionmentioning

confidence: 99%

Evaluating Drainmod‐s to Predict Drainage Water Salinity and Groundwater Table Depth During Winter Cropping in Heavy‐Textured Paddy Soils

Davoodi

Darzi‐Naftchali

Aghajani‐Mazandarani

2019

Irrigation and Drainage

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Simulation models can quickly and cost‐effectively describe various aspects of management practices in newly reclaimed agricultural soils. In this research, the capability of the DRAINMOD‐S model was evaluated to predict the salinity of the subsurface drainage effluents in a newly subsurface drained paddy field during winter cropping. Measurements of groundwater table depths and drainage water salinity were taken in three conventional subsurface drainage systems at the Sari Agricultural Sciences and Natural Resources University, northern Iran, during three canola growing seasons (2011–2012, 2015–2016 and 2016–2017). The data were used to calibrate and validate the model. The model provided better predictions of groundwater table depths in shallower drainage systems. Measured and simulated drainage water salinities varied, respectively, from 620 to 1580 and 790–1430 mg l−1 in the calibration process and from 441 to 1640 and 656–1820 mg l−1 in the validation process. The differences between measured and simulated salt loads were in the range of 59–174 and 43–586 kg ha−1 in calibration and validation, respectively. The results indicated that DRAINMOD‐S can be used as a management tool to diminish environmental issues in heavy paddy soils from the viewpoint of salt load. © 2019 John Wiley & Sons, Ltd.

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Modeling paddy field subsurface drainage using HYDRUS-2D

Cited by 29 publications

References 12 publications

When Green Infrastructure Turns Grey: Plant Water Stress as a Consequence of Overdesign in a Tree Trench System

When Green Infrastructure Turns Grey: Plant Water Stress as a Consequence of Overdesign in a Tree Trench System

When Green Infrastructure Turns Grey: Implications of Overdesign on Plant Water Stress

Evaluating Drainmod‐s to Predict Drainage Water Salinity and Groundwater Table Depth During Winter Cropping in Heavy‐Textured Paddy Soils

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