Impact of the shift from groundwater to surface water irrigation on aquifer dynamics and hydrochemistry in a semi-arid region in the south of Portugal

Stigter, Tibor; Dill, Amélia Carvalho; Ribeiro, Luís; Reis, Eusébio

doi:10.1016/j.agwat.2006.04.004

Cited by 75 publications

(46 citation statements)

References 16 publications

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“…The reduced nitrogen load is directly related to the absence of nitrogen in surface water and, thus, there is a much lower risk of overfertilization; before that time fertilizers were applied in excess to crop requirements in that area because the high levels of nitrogen already present in the groundwater were never taken into account. Stigter et al (2006) also indicated that the shift towards surface water for irrigation influenced the groundwater heads, i.e., a sharp rise of the water table in Campina da Luz; therefore, possibly entering the root zone and damaging the citrus trees at some locations. Nevertheless, climate change will have impact on both groundwater and surface-water resources as source options at the same time.…”

Section: Impact Of Irrigation Source On Groundwater and Adaption Stramentioning

confidence: 99%

“…In semi-arid cases, the degree of nitrate contamination and salinization depends greatly on the irrigation source; surface-water use for irrigation can trigger a groundwater freshening mechanism and thus invert the trend of increasing salinities (Stigter et al 2006). Freshening occurs, mainly attributed to the end of the groundwater extractions and associated recycling process, the increased groundwater discharge and the additional recharge from return flow.…”

Section: Impact Of Irrigation Source On Groundwater and Adaption Stramentioning

confidence: 99%

“…Irrigation return flow can be a little mineralized, but extremely high in nitrate, as was found to occur in a surface-water irrigation district of the Ebro River basin in Spain (Causapé et al 2004). From the report by Stigter et al (2006) on Campina da Luz, a semi-arid region in south Portugal, the shift from groundwater to surface-water irrigation for citrus orchards resulted in the reduction of the nitrogen residual in soil and groundwater. The reduced nitrogen load is directly related to the absence of nitrogen in surface water and, thus, there is a much lower risk of overfertilization; before that time fertilizers were applied in excess to crop requirements in that area because the high levels of nitrogen already present in the groundwater were never taken into account.…”

Section: Impact Of Irrigation Source On Groundwater and Adaption Stramentioning

confidence: 99%

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Impact of climate change on irrigation requirements in terms of groundwater resources

et al. 2010

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Climate change affects not only water resources but also water demand for irrigation. A large proportion of the world's agriculture depends on groundwater, especially in arid and semi-arid regions. In several regions, aquifer resources face depletion. Groundwater recharge has been viewed as a by-product of irrigation return flow, and with climate change, aquifer storage of such flow will be vital. A general review, for a broadbased audience, is given of work on global warming and groundwater resources, summarizing the methods used to analyze the climate change scenarios and the influence of these predicted changes on groundwater resources around the world (especially the impact on regional groundwater resources and irrigation requirements). Future challenges of adapting to climate change are also discussed. Such challenges include water-resources depletion, increasing irrigation demand, reduced crop yield, and groundwater salinization. The adaptation to and mitigation of these effects is also reported, including useful information for water-resources managers and the development of sustainable groundwater irrigation methods. Rescheduling irrigation according to the season, coordinating the groundwater resources and irrigation demand, developing more accurate and complete modeling prediction methods, and managing the irrigation facilities in different ways would all be considered, based on the particular cases.

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Section: Impact Of Irrigation Source On Groundwater and Adaption Stramentioning

confidence: 99%

Section: Impact Of Irrigation Source On Groundwater and Adaption Stramentioning

confidence: 99%

Section: Impact Of Irrigation Source On Groundwater and Adaption Stramentioning

confidence: 99%

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Impact of climate change on irrigation requirements in terms of groundwater resources

et al. 2010

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“…6) suggests that both N and S are used in the study area in the form of (NH 4 )2SO 4 -fertilisers (Bohike et (Fig. 7), highlighting that both elements are mostly originated from the excessive use of Ca(NO 3 ) 2 -fertilizers (Stigter et al, 2006). Therefore, the nitrate contamination is a result of the local hydrogeological setup coupled with the traditionally applied flood irrigation and the complete lack of environmental awareness regarding the over-fertilisation and the utilisation of recycled waste water.…”

Section: Nitratementioning

confidence: 99%

Hydrochemical Investigation of Groundwater Contamination in the Grombalia Shallow Aquifer, Cap Bon Peninsula, Tunisia: Impact of Irrigation with Industrial Waste Water

Moussa¹,

Zouari²

2011

Waste Water - Evaluation and Management

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“…1), so that regional water supply planning, management and quality control was impossible. At the same time, a few aquifers were suffering increasing pressures from human activities, such as nitrate contamination in irrigated areas (Stigter et al, 1998(Stigter et al, , 2006a and saltwater intrusion in coastal sectors (Carreira, 1991;Salgueiro and Ribeiro, 2001).…”

Section: Evolution Of the Use Of Groundwater Through Timementioning

confidence: 99%

Screening of sustainable groundwater sources for integration into a regional drought-prone water supply system

Stigter¹,

Monteiro

Nunes

et al. 2009

Hydrol. Earth Syst. Sci.

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Abstract. This paper reports on the qualitative and quantitative screening of groundwater sources for integration into the public water supply system of the Algarve, Portugal. The results are employed in a decision support system currently under development for an integrated water resources management scheme in the region. Such a scheme is crucial for several reasons, including the extreme seasonal and annual variations in rainfall, the effect of climate change on more frequent and long-lasting droughts, the continuously increasing water demand and the high risk of a single-source water supply policy. The latter was revealed during the severe drought of 2004 and 2005, when surface reservoirs were depleted and the regional water demand could not be met, despite the drilling of emergency wells.For screening and selection, quantitative criteria are based on aquifer properties and well yields, whereas qualitative criteria are defined by water quality indices. These reflect the well's degree of violation of drinking water standards for different sets of variables, including toxicity parameters, nitrate and chloride, iron and manganese and microbiological parameters. Results indicate the current availability of at least 1100 l s −1 of high quality groundwater (55% of the regional demand), requiring only disinfection (900 l s −1 ) or basic treatment, prior to human consumption. These groundwater withdrawals are sustainable when compared to mean annual recharge, considering that at least 40% is preserved for ecological demands. A more accurate and comprehensive analysis of sustainability is performed with the help of steady-state and transient groundwater flow simulations, which account for aquifer geometry, boundary conditions, recharge and discharge rates, pumping activity and seasonCorrespondence to: T. Y. Stigter (tibor.stigter@ist.utl.pt) ality. They permit an advanced analysis of present and future scenarios and show that increasing water demands and decreasing rainfall will make the water supply system extremely vulnerable, with a high risk of groundwater salinization and ecosystem degradation.

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Impact of the shift from groundwater to surface water irrigation on aquifer dynamics and hydrochemistry in a semi-arid region in the south of Portugal

Cited by 75 publications

References 16 publications

Impact of climate change on irrigation requirements in terms of groundwater resources

Impact of climate change on irrigation requirements in terms of groundwater resources

Hydrochemical Investigation of Groundwater Contamination in the Grombalia Shallow Aquifer, Cap Bon Peninsula, Tunisia: Impact of Irrigation with Industrial Waste Water

Screening of sustainable groundwater sources for integration into a regional drought-prone water supply system

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