Drainage models to predict soil water regimes in drained soils: a UK perspective

Armstrong, A. C.; Matthews, A. M.; Castle, Denise

doi:10.1007/bf00880864

Cited by 3 publications

(1 citation statement)

References 12 publications

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“…Similarly, analysis of annual grass productivity has suggested that well-drained soils improve yield by 1.25-3.55t/ha compared to poorly-drained soils in the same climatic conditions (Fitzgerald et al, 2005). However, the hydraulic performance of drainage systems has been shown to be sensitive to changing climatic parameters dependent on their design (Armstrong et al, 1995).…”

Section: Introductionmentioning

confidence: 99%

Climate change and soil wetness limitations for agriculture: Spatial risk assessment framework with application to Scotland

Brown

2017

Geoderma

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Waterlogged soils can act as a major constraint on agriculture by imposing limits on the use of machinery and stocking levels. Inappropriate use of waterlogged soils can cause serious damage to soil and water resources. Limitations are particularly pronounced in locations with wetter climates and on soils which have inherent drainage problems. Constraints may also vary temporally due to climate variability and climate change. These issues are investigated through the strategic use of a risk assessment framework that combines climatic and soil factors to map changes in soil wetness risk at country level. Wetness risk is evaluated in terms of soil wetness classes and the constraints it imposes on arable and improved grassland using an empirical land capability scheme. A case study in Scotland analyses spatio-temporal variations of wetness risk and associated land-use constraints for 1961-1980 and 1991-2010 periods and using a future 2050s projection based upon the HadRM3/HadCM3 climate model ensemble. Results suggest increased risk levels in recent decades for southwest and central Scotland which are both important areas for livestock agriculture. However, wetness risk in these high risk areas is tentatively projected to reduce under average 2050s conditions based upon a central estimate from the model ensemble. Wetness risk has been adjusted based upon the assumed presence and performance of subsurface field drainage systems but this remains a significant uncertainty due to limited data availability. As artificial drainage represents the major alternative adaptation strategy compared to change of land use, the case study highlights a need to further evaluate its efficacy and long-term viability for those areas identified at high risk.

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Section: Introductionmentioning

confidence: 99%

Climate change and soil wetness limitations for agriculture: Spatial risk assessment framework with application to Scotland

Brown

2017

Geoderma

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Modeling subsurface drainage for salt load management in southeastern Australia

Wahba

Christen

2006

Irrig Drainage Syst

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Subsurface drainage has been implemented in irrigation areas of South-eastern Australia to control water logging and land salinisation. Subsurface drainage has been identified as a major salt exporter from irrigated areas.The water table management simulation model DRAINMOD-S was evaluated to simulate daily water table depth, drain outflow, and salt loads by using experimental field data from a two year field trial was carried out in the Murrumbidgee Irrigation Area South-eastern Australia to study different options for subsurface drainage system design and management to reduce salt load export. Three subsurface drainage systems were modeled, deep widely spaced pipe drains, shallow closely spaced drains and deep pipe drains that were managed with weirs to prevent flow when the water table fell below 1.2 m. The reliability of the model has been evaluated by comparing observed and simulated values.Good agreement was found between the observed and simulated values. The model confirmed the field observations that shallow drains had the lowest salt load and that by managing deep drains with weirs salt loads could be significantly reduced.This work shows the value of the DRAINMOD-S model in being able to describe various drainage design and management strategies under the semi-arid conditions of South-eastern Australia. The model can now be used to investigate design and management options in detail for different site conditions. This will assist decision makers in providing appropriate subsurface drainage management policies to meet drainage disposal constraints within integrated water resources management planning.

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Drainage Simulation Models

Skaggs

2015

Agronomy Monographs

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Drainage models to predict soil water regimes in drained soils: a UK perspective

Cited by 3 publications

References 12 publications

Climate change and soil wetness limitations for agriculture: Spatial risk assessment framework with application to Scotland

Climate change and soil wetness limitations for agriculture: Spatial risk assessment framework with application to Scotland

Modeling subsurface drainage for salt load management in southeastern Australia

Drainage Simulation Models

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