Sustainable use of groundwater for irrigation: a numerical analysis of the subsoil water fluxes

Ahmad, Mobin-ud-Din; Bastiaanssen, W.G.M.; Feddes, R.A.

doi:10.1002/ird.59

Cited by 69 publications

(39 citation statements)

References 13 publications

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“…From Figure 4, three distinctly different phases for the water fluxes at the water table can be observed throughout J u l-9 8 A u g -9 8 S e p -9 8 O c t-9 8 N o v -9 8 D e c -9 8 J a n -9 9 F e b -9 9 M a r-9 9 A p r-9 9 M a y -9 9 Water depth (mm) (Ahmad et al, 2002). Figure 5 presents several soil water content and soil water potential profiles after a rainfall.…”

Section: Temporal Pattern Of Capillary Upflow and Percolationmentioning

confidence: 99%

Water fluxes at a fluctuating water table and groundwater contributions to wheat water use in the lower Yellow River flood plain, China

Yang

Wan

Deng

et al. 2007

Hydrological Processes

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Abstract:Capillary upflow from and deep percolation to a water table may be important in crop water supply in irrigated areas of the lower Yellow River flood plain, north China. These fluxes at the water table and the variations of the capillary upflow in relation to crop evapotranspiration need to be investigated to quantify the effect of a water table on soil water balance and to improve agricultural water management. A large weighing lysimeter was used to determine daily crop evapotranspiration, daily capillary upflow from and daily percolation to a fluctuating water table during a rotation period with wheat growing in a dry season and maize in a rainy season. The water table depth varied in the range 0Ð7-2Ð3 m during the maize growth period and 1Ð6-2Ð4 m during the wheat growth period. Experimental results showed that the capillary upflow and the percolation were significant components of the soil water balance. Three distinctly different phases for the water fluxes at the water table were observed through the rotation period: water downward period, the period of no or small water fluxes, and water upward period. It implied that the temporal pattern of these water fluxes at the water table was intimately associated with the temporal distribution of rainfall through the rotation period. An empirical equation was determined to estimate the capillary upflow in relation to wheat evapotranspiration and root zone soil water content for local irrigation scheduling. Coupled with the FAO-Penman-Monteith equation, the equation offers a fast and low cost solution to assess the effect of capillary upflow from a water table on wheat water use.

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Section: Temporal Pattern Of Capillary Upflow and Percolationmentioning

confidence: 99%

Water fluxes at a fluctuating water table and groundwater contributions to wheat water use in the lower Yellow River flood plain, China

Yang

Wan

Deng

et al. 2007

Hydrological Processes

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“…The SWAP model has been applied and tested under many different conditions and locations. Ahmad et al used the SWAP model to calculate the soil moisture content and vertical soil water fluxes in the unsaturated zone for the cotton-wheat and rice-wheat cropping system of Punjab, Pakistan [11]. Singh et al applied the SWAP model to estimate the components of field water balance for water productivity analysis in the Sirsa district, India [12].…”

Section: Introductionmentioning

confidence: 99%

Application of the SWAP model to simulate the field water cycle under deficit irrigation in Beijing, China

Feng

Huo

et al. 2011

Mathematical and Computer Modelling

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a b s t r a c tThe evaluation of the field water cycle under deficit irrigation plays an important role in studying mechanism of field water dynamics, optimization of agricultural water management strategies, and assessment of regional water resources. In this study, the agro-hydrological Soil-Water-Atmosphere-Plant (SWAP) model was used to evaluate the field water cycle for a winter wheat-summer corn double cropping system in Beijing, China under deficit irrigation. A carefully designed field experiment was carried out from 2007 to 2009 with six irrigation treatments. The SWAP model was calibrated with soil water contents of two treatments. The dataset of the main field water balance components including soil water content, profile water storage and water flux through the bottom of the root zone were used to validate the SWAP model. The average root mean square error (RMSE) and the mean relative error (MRE) values of predicted soil water contents were 2.4% and 8.0%, respectively. The dataset of predicted and measured values were close to the 1:1 scale line for both the profile water storage and soil water flux. As an application of the SWAP model, the optimal irrigation management practices for the hydrologic years of 75%, 50% and 25%, respectively, in the Beijing area were obtained. The simulated average amount of water saving and groundwater recharge under the optimal irrigation schedules were about 190 mm and 16.1 mm, respectively. This study indicates that the SWAP model can be used as a powerful tool to simulate the field water cycle and evaluate irrigation practices.Crown

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“…In the Heihe River basin, China, wetlands are now often experiencing extended periods of high soil salinization levels and associated water availability problems due to the impacts of high evaporative conditions, poor surface drainage, human population pressures, and the associated changes in land use [2,3]. Soil salinity limits plant growth [4] and negatively influences soil quality [5,6], resulting in the change of community structure, density, and growth status. Wetland areas decreased by 42% from 1975 to 2010 within the middle Heihe River basin [7].…”

Section: Introductionmentioning

confidence: 99%

Modeling of Soil Water and Salt Dynamics and Its Effects on Root Water Uptake in Heihe Arid Wetland, Gansu, China

Jian-guo

et al. 2015

Water

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Abstract:In the Heihe River basin, China, increased salinity and water shortages present serious threats to the sustainability of arid wetlands. It is critical to understand the interactions between soil water and salts (from saline shallow groundwater and the river) and their effects on plant growth under the influence of shallow groundwater and irrigation. In this study, the Hydrus-1D model was used in an arid wetland of the Middle Heihe River to investigate the effects of the dynamics of soil water, soil salinization, and depth to water table (DWT) as well as groundwater salinity on Chinese tamarisk root water uptake. The modeled soil water and electrical conductivity of soil solution (ECsw) are for ECsw, during the model calibration and validation periods, respectively). The calibrated model was used in scenario analyses considering different DWTs, salinity levels and the introduction of preseason irrigation. The results showed that (I) Chinese tamarisk root distribution was greatly affected by soil water and salt distribution in the soil profile, with about 73.8% of the roots being distributed in the 20-60 cm layer; (II) root water uptake accounted for 91.0% of the potential maximal value when water stress was considered, and for 41.6% when both water and salt stress were considered; (III) root water uptake was very sensitive to fluctuations of the water table, and was greatly reduced when the DWT was either dropped or raised 60% of the 2012 reference depth; (IV) arid wetland vegetation exhibited a high level of groundwater dependence even though shallow groundwater resulted in increased soil salinization and (V) preseason irrigation could effectively increase root water uptake by leaching salts from the root zone. We concluded that a suitable water table and groundwater salinity coupled with proper irrigation are key factors to sustainable development of arid wetlands.

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Sustainable use of groundwater for irrigation: a numerical analysis of the subsoil water fluxes

Cited by 69 publications

References 13 publications

Water fluxes at a fluctuating water table and groundwater contributions to wheat water use in the lower Yellow River flood plain, China

Water fluxes at a fluctuating water table and groundwater contributions to wheat water use in the lower Yellow River flood plain, China

Application of the SWAP model to simulate the field water cycle under deficit irrigation in Beijing, China

Modeling of Soil Water and Salt Dynamics and Its Effects on Root Water Uptake in Heihe Arid Wetland, Gansu, China

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