Geochemical processes controlling water salinization in an irrigated basin in Spain: Identification of natural and anthropogenic influence

Merchán, Daniel; Auqué, Luis F.; Acero, Patricia; Gimeno, M. Concepción; Causapé, J.

doi:10.1016/j.scitotenv.2014.09.041

Cited by 47 publications

(30 citation statements)

References 43 publications

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“…The clearing of natural vegetation for rainfed crop production, especially in arid to semiarid areas, is reported to increase mobilization of salts stored in the vadose zone over millennia due to an increases in soil water leaching (Scanlon et al, 2007). The shift to irrigated agriculture normally enhances this process due to an increase in available water for leaching (Merchán et al, 2015a). The rate at which salts are washed out depends mainly on the available amount of salts and the water leached.…”

Section: Agricultural Pollution Dynamics In Irrigated Areas In Contramentioning

confidence: 99%

Runoff, nutrients, sediment and salt yields in an irrigated watershed in southern Navarre (Spain)

Merchán

Casalí

Lersundi

et al. 2018

Agricultural Water Management

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The environmental impact of irrigated agriculture on water quality was assessed in Landazuria watershed (Navarre, northeast Spain), a 479.5 ha watershed with 53% of irrigated agricultural land. In the framework of a long-term monitoring program, precipitation and discharge were measured at 10-minutes intervals and compound daily water samples were collected during the agricultural years (September to August) 2007-2016, and analysed for nitrate (NO 3-), phosphate (PO 4 3-), sediment and total dissolved solids (TDS) concentrations. Typical agricultural management (including crop surfaces, irrigation and fertilization rates) was obtained from inquiries to farmers. Concentration and yield of the studied variables presented a high degree of variation, both intra-and inter-annual. Median concentration for the entire study period were 185, <0.

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Section: Agricultural Pollution Dynamics In Irrigated Areas In Contramentioning

confidence: 99%

Runoff, nutrients, sediment and salt yields in an irrigated watershed in southern Navarre (Spain)

Merchán

Casalí

Lersundi

et al. 2018

Agricultural Water Management

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“…The deterioration of coastal aquifers due to salinization may endanger future water exploitation . There are a number of mechanisms that have the potential to lead to salinity in coastal regions: (i) agricultural return flows from local groundwater extraction (Bouchaou et al, 2008;Cruz-Fuentes et al, 2014); (ii) a high degree of evaporation in residual saline water (McCaffrey et al, 1987;Han et al, 2014); (iii) recharge/leakage of imported salt water from the sea for fishing industries (Chang and Li, 2011); (iv) seawater intrusion/tidal flat/sea level rising (Werner et al, 2013); (v) saltwater upconing from underlying aquifers (Barlow, 2003;Szynkiewicz et al, 2008) or downward movement of shallow saline groundwater from upper aquifers under extensive pumping (Vengosh and Ben-Zvi, 1994;Guo et al, 1995;Cary et al, 2015); (vi) mixing modern recharged water with the palaeo-seawater (brines) (Yechieli et al, 1992;Han et al, 2011Han et al, , 2012; (vii) sewage effluents (Vengosh et al, 1998);and (viii) water-rock interaction (Jones et al, 1999;Vengosh et al, 2007;de Montety et al, 2008;Mongelli et al, 2013;Merchán et al, 2015). For a reliable water management/protection plan and to prevent further deterioration, it is essential to study the major geochemical processes that modify hydrochemical compositions of waters salinized by seawater intrusion and to elucidate the salinity sources and flow paths that exist in the coastal aquifer.…”

Section: Introductionmentioning

confidence: 99%

Residence times of groundwater and nitrate transport in coastal aquifer systems: Daweijia area, northeastern China

Han

Cao

McCallum

et al. 2015

Science of The Total Environment

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• Examine high nitrate contents in the coastal carbonate aquifer of northeast China • Estimate renewal rates and mean residence times of groundwater in coastal aquifers • Evaluate the relation between groundwater age distribution and nitrate transport • Propose potential pollution patterns of nitrate distribution in the coastal aquifer • Identify anthropogenic input mainly responsible for increasing groundwater salinity a b s t r a c t a r t i c l e i n f o H and CFCs methods were applied to provide a better understanding of the relationship between the distribution of groundwater mean residence time (MRT) and nitrate transport, and to identify sources of nitrate concentrations in the complex coastal aquifer systems. There is a relatively narrow range of isotopic composition (ranging from − 8.5 to − 7.0‰) in most groundwater. Generally higher tritium contents observed in the wet season relative to the dry season may result from rapid groundwater circulation in response to the rainfall through the preferential flow paths. In the well field, the relatively increased nitrate concentrations of groundwater, accompanied by the higher tritium contents in the wet season, indicate the nitrate pollution can be attributed to domestic wastes. The binary exponential and piston-flow mixing model (BEP) yielded feasible age distributions based on the conceptual model. The good inverse relationship between groundwater MRTs (92-467 years) and the NO 3 − concentrations in the shallow Quaternary aquifers indicates that elevated nitrate concentrations are attributable to more recent recharge for shallow groundwater. However, there is no significant relationship between the MRTs (8-411 years) and the NO 3 − concentrations existing in the carbonate aquifer system, due to the complex hydrogeological conditions, groundwater age distributions and the range of contaminant source areas. Nitrate in the groundwater system without denitrification effects could accumulate and be transported for tens of years, through the complex carbonate aquifer matrix and the successive inputs of nitrogen from various sources.

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“…Other factors controlling the salinity level of IRFs include quality, volume and rate of applied water, climate, soils, water table depth, type of aquifer, and the specific agricultural, drainage and irrigation management practices (Tanji and Kielen 2002;Aragues and Tanji 2003;Kass et al 2005;Scanlon et al 2007Scanlon et al , 2010Garcia-Garizabal and Causape 2010;Merchan et al 2015). Irrigation water quality will substantially influence the extent of the groundwater salinization process, ranging from fresh water to saline water depending on the source.…”

Section: Direct Impactsmentioning

confidence: 99%

Impacts of agricultural irrigation on groundwater salinity

et al. 2018

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Agricultural irrigation represents the main use of global water resources. Irrigation has an impact on the environment, and scientific evidence suggests that it inevitably leads to salinization of both soil and aquifers. The effects are most pronounced under arid and semi-arid conditions. In considering the varied impacts of irrigation practices on groundwater quality, these can be classed as either directthe direct result of applying water and accompanying agrochemicals to croplandor indirectthe effects of irrigation abstractions on groundwater hydrogeochemistry. This paper summarizes and illustrates through paradigmatic case studies the main impacts of irrigation practices on groundwater salinity. Typically, a diverse range of groundwater salinization processes operating concomitantly at different time scales (from days to hundreds of years) is involved in agricultural irrigation. Case studies suggest that the existing paradigm for irrigated agriculture of focusing mainly on crop production increases has contributed to widespread salinization of groundwater resources.

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Geochemical processes controlling water salinization in an irrigated basin in Spain: Identification of natural and anthropogenic influence

Cited by 47 publications

References 43 publications

Runoff, nutrients, sediment and salt yields in an irrigated watershed in southern Navarre (Spain)

Runoff, nutrients, sediment and salt yields in an irrigated watershed in southern Navarre (Spain)

Residence times of groundwater and nitrate transport in coastal aquifer systems: Daweijia area, northeastern China

Impacts of agricultural irrigation on groundwater salinity

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