Abstract
| Original language | English |
|---|---|
| Pages (from-to) | 23-39 |
| Number of pages | 17 |
| Journal | Paddy and Water Environment |
| Volume | 8 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 2010 |
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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 journal › Article
TY - JOUR
T1 - Assessment of rice hydraulic loading impacts on groundwater and salinity levels
AU - Khan, Shahbaz
AU - Rana, Tariq
AU - Carroll, Jason
AU - Gabriel, Hamza
N1 - Imported on 12 Apr 2017 - DigiTool details were: Journal title (773t) = Paddy and Water Environment. ISSNs: 1611-2490;
PY - 2010
Y1 - 2010
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).
U2 - 10.1007/s10333-009-0171-0
DO - 10.1007/s10333-009-0171-0
M3 - Article
VL - 8
SP - 23
EP - 39
JO - Paddy and Water Environment
JF - Paddy and Water Environment
SN - 1611-2490
IS - 1
ER -