Assessment of rice hydraulic loading impacts on groundwater and salinity levels

Shahbaz Khan, Tariq Rana, Jason Carroll, Hamza Gabriel

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Abstract This paper describes the impact of ricehydraulic loading (percentage area under rice crop) ongroundwater levels and salinity in the Murrumbidgee irrigationarea (MIA), Australia using a MODFLOW-basedmodelling approach. The model simulations show that thegroundwater levels will be in equilibrium after a fall ofapproximately 1 m under most of the areas, however, thegroundwater salinity levels will rise by more than 1,000ls/cm in most parts of irrigation area. If the rice growingarea is reduced by 50 and 75%, there can be a net decline ingroundwater levels during the first 2 years and then a newquasi-equilibrium will be established. To downscale theseresults at the farm level, SWAGMAN Farm model inconjunction with groundwater outflow rates obtained froma three-dimensional MODFLOW model was applied fordetermining net recharge rates under rice for different areaswithin the MIA. The highest net recharge during 2005'2006 season was 0.84 ML/ha (84 mm) in parts of theirrigation system, whereas the average net recharge due torice hydraulic loading for the whole MIA during 2005'2006 season was estimated as 0.34 ML/ha (34 mm).
Original languageEnglish
Pages (from-to)23-39
Number of pages17
JournalPaddy and Water Environment
Volume8
Issue number1
DOIs
Publication statusPublished - 2010

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Groundwater
recharge
fluid mechanics
groundwater
rice
Hydraulics
salinity
hydraulics
Farms
farm
farms
Irrigation
Crops
simulation models
outflow
irrigation
crop
crops
simulation
rate

Cite this

Khan, Shahbaz ; Rana, Tariq ; Carroll, Jason ; Gabriel, Hamza. / Assessment of rice hydraulic loading impacts on groundwater and salinity levels. In: Paddy and Water Environment. 2010 ; Vol. 8, No. 1. pp. 23-39.
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abstract = "Abstract This paper describes the impact of ricehydraulic loading (percentage area under rice crop) ongroundwater levels and salinity in the Murrumbidgee irrigationarea (MIA), Australia using a MODFLOW-basedmodelling approach. The model simulations show that thegroundwater levels will be in equilibrium after a fall ofapproximately 1 m under most of the areas, however, thegroundwater salinity levels will rise by more than 1,000ls/cm in most parts of irrigation area. If the rice growingarea is reduced by 50 and 75{\%}, there can be a net decline ingroundwater levels during the first 2 years and then a newquasi-equilibrium will be established. To downscale theseresults at the farm level, SWAGMAN Farm model inconjunction with groundwater outflow rates obtained froma three-dimensional MODFLOW model was applied fordetermining net recharge rates under rice for different areaswithin the MIA. The highest net recharge during 2005'2006 season was 0.84 ML/ha (84 mm) in parts of theirrigation system, whereas the average net recharge due torice hydraulic loading for the whole MIA during 2005'2006 season was estimated as 0.34 ML/ha (34 mm).",
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Assessment of rice hydraulic loading impacts on groundwater and salinity levels. / Khan, Shahbaz; Rana, Tariq; Carroll, Jason; Gabriel, Hamza.

In: Paddy and Water Environment, Vol. 8, No. 1, 2010, p. 23-39.

Research output: Contribution to journalArticle

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T1 - Assessment of rice hydraulic loading impacts on groundwater and salinity levels

AU - Khan, Shahbaz

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AU - Carroll, Jason

AU - Gabriel, Hamza

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N2 - Abstract This paper describes the impact of ricehydraulic loading (percentage area under rice crop) ongroundwater levels and salinity in the Murrumbidgee irrigationarea (MIA), Australia using a MODFLOW-basedmodelling approach. The model simulations show that thegroundwater levels will be in equilibrium after a fall ofapproximately 1 m under most of the areas, however, thegroundwater salinity levels will rise by more than 1,000ls/cm in most parts of irrigation area. If the rice growingarea is reduced by 50 and 75%, there can be a net decline ingroundwater levels during the first 2 years and then a newquasi-equilibrium will be established. To downscale theseresults at the farm level, SWAGMAN Farm model inconjunction with groundwater outflow rates obtained froma three-dimensional MODFLOW model was applied fordetermining net recharge rates under rice for different areaswithin the MIA. The highest net recharge during 2005'2006 season was 0.84 ML/ha (84 mm) in parts of theirrigation system, whereas the average net recharge due torice hydraulic loading for the whole MIA during 2005'2006 season was estimated as 0.34 ML/ha (34 mm).

AB - Abstract This paper describes the impact of ricehydraulic loading (percentage area under rice crop) ongroundwater levels and salinity in the Murrumbidgee irrigationarea (MIA), Australia using a MODFLOW-basedmodelling approach. The model simulations show that thegroundwater levels will be in equilibrium after a fall ofapproximately 1 m under most of the areas, however, thegroundwater salinity levels will rise by more than 1,000ls/cm in most parts of irrigation area. If the rice growingarea is reduced by 50 and 75%, there can be a net decline ingroundwater levels during the first 2 years and then a newquasi-equilibrium will be established. To downscale theseresults at the farm level, SWAGMAN Farm model inconjunction with groundwater outflow rates obtained froma three-dimensional MODFLOW model was applied fordetermining net recharge rates under rice for different areaswithin the MIA. The highest net recharge during 2005'2006 season was 0.84 ML/ha (84 mm) in parts of theirrigation system, whereas the average net recharge due torice hydraulic loading for the whole MIA during 2005'2006 season was estimated as 0.34 ML/ha (34 mm).

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