Nitrate probability mapping in the northern aquifer alluvial system of the river Tagus (Portugal) using Disjunctive Kriging

Mendes, María Manuela; Ribeiro, Luís

doi:10.1016/j.scitotenv.2009.10.069

Cited by 42 publications

(15 citation statements)

References 30 publications

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“…Geochemical and isotopic data and signatures have been the subject of variogram analysis and kriging in the past (Samper and Neuman, 1989;Myers et al, 1982;Subyani and Ş en, 1989). More recent work focused on soil water content (Snepvangers et al, 2003) and contaminants such as nitrate (Mendes and Ribeiro, 2010;Chica-Olmo et al, 2014) and arsenic (Gong et al, 2014;Antunes and Albuquerque, 2013;Goovaerts et al, 2005;Lee et al, 2007;James et al, 2014) The geostatistical analyses in this study were performed on the state-wide data set, which was divided into subsets according to depth in order to address the vertical structure of the data. Besides addressing the research questions presented above, the purpose of this paper is to present the data set to the scientific community to solicit further research.…”

Section: Introductionmentioning

confidence: 99%

Geostatistical analysis of tritium, groundwater age and other noble gas derived parameters in California

et al. 2016

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Key characteristics of California groundwater systems related to aquifer vulnerability, sustainability, recharge locations and mechanisms, and anthropogenic impact on recharge are revealed in a spatial geostatistical analysis of a unique data set of tritium, noble gases and other isotopic analyses unprecedented in size at nearly 4000 samples. The correlation length of key groundwater residence time parameters varies between tens of kilometers ((3)H; age) to the order of a hundred kilometers ((4)Heter; (14)C; (3)Hetrit). The correlation length of parameters related to climate, topography and atmospheric processes is on the order of several hundred kilometers (recharge temperature; δ(18)O). Young groundwater ages that highlight regional recharge areas are located in the eastern San Joaquin Valley, in the southern Santa Clara Valley Basin, in the upper LA basin and along unlined canals carrying Colorado River water, showing that much of the recent recharge in central and southern California is dominated by river recharge and managed aquifer recharge. Modern groundwater is found in wells with the top open intervals below 60 m depth in the southeastern San Joaquin Valley, Santa Clara Valley and Los Angeles basin, as the result of intensive pumping and/or managed aquifer recharge operations.

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Section: Introductionmentioning

confidence: 99%

Geostatistical analysis of tritium, groundwater age and other noble gas derived parameters in California

et al. 2016

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“…High NO 3 concentration (>50 mgNO 3 /L) has been recorded in numerous aquifers all over the world, e.g. in Canada [20] and Portugal [21]. However, in the case of the experimental sites, no significant anthropogenic effect was observed in the NO 3 content and the nitrate concentrations did not exceed the maximum concentrations allowed by EU and WHO in water intended for human consumption and the limit value of good quality of groundwater (50 mgNO 3 /L).…”

Section: B Nitrogen Compoundsmentioning

confidence: 99%

Monitoring of Groundwater Chemical Composition in Areas of Crop Production

Fronczyk¹,

Lech²,

Radziemska³

et al. 2016

5th International Conference on Biological, Chemical and Environmental Sciences (BCES-2016) March 24-25, 2016 London (United Ki

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Abstract-The main objective of the research presented in the paper was the monitoring of contaminant indicators in the groundwater in the area of precision cultivation of winter wheat in the northern, southern and central part of Poland. On each of the experimental sites, 6 piezometers were located, from which samples for chemical analysis were taken. The following parameters were determined: pH, electrical conductivity, nitrogen compounds, phosphates, sulphates, and heavy metals (Cu, Pb, Zn).The results obtained revealed that fertilization has impact on the level of phosphorus, which in most of the analyzed samples, according to Polish legal provisions, was characteristic of III Class of groundwater quality (0.5 -1.0 mgPO 4 /L). The concentration of NO 3 was below the highest acceptable concentration of that parameter in drinking water recommended by WHO (50 mg NO 3 /L). Nitrites, copper and lead concentrations did not exceed the maximum limits under Polish legal provisions for water intended for human consumption. In addition, sulphate ions had in most samples a concentration characteristic of III Class of groundwater quality (60 -250 MgSO 4 /L), and in samples collected at the Chociwel site -of IV Class (250 -300 mgSO 4 /L). However, the increased levels of this parameter did not result from fertilization. The study shows that the applied precision nitrogen fertilization could influence the acceptable concentration of nitrates in groundwater, while the inadequacy of the phosphoric fertilizer to the needs of the plants could have resulted in the increased concentrations of phosphate in the analyzed groundwater samples.

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“…The theoretical basis of geostatistics has been described by several authors (Isaaks and Srivastava 1989;Xie et al 2011;Mendes and Ribeiro 2010). The main tool in geostatistics is the variogram, which expresses the spatial dependence between neighboring observations (Isaaks and Srivastava 1989).…”

Section: Geostatisticsmentioning

confidence: 99%

An application of MC-SDSS for water supply management during a drought crisis

Jeihouni

Toomanian

Alavipanah

et al. 2015

Environ Monit Assess

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Climate change influences many countries' rainfall patterns and temperatures. In Iran, population growth has increased water demands. Tabriz is the capital of East Azerbaijan province, in northwestern Iran. A large proportion of the water required for this city is supplied from dams; thus, it is important to find alternatives to supply water for this city, which is the largest industrial city in northwestern Iran. In this paper, the groundwater quality was assessed using 70 wells in Tabriz Township. This work seeks to define the spatial distribution of groundwater quality parameters such as chloride, electrical conductivity (EC), pH, hardness, and sulfate using Geographic Information Systems (GIS) and geostatistics; map groundwater quality for drinking purposes employing multiple-criteria decision-making (MCDM), such as the Analytical Hierarchy Process (AHP) and fuzzy logic, in the study area; and develop an Spatial Decision Support System (SDSS) for managing a water crisis in the region. The map produced by the AHP is more accurate than the map produced using fuzzy logic because in the AHP, priorities were assigned to each parameter based on the weights given by water quality experts. The final map indicates that the groundwater quality increases from the north to the south and from the west to the east within the study area. During critical conditions, the groundwater quality maps and the presented SDSS core can be utilized by East Azerbaijan Regional Water Company to develop an SDSS to drill new wells or to select existing wells to supply drinking water to Tabriz City.

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Nitrate probability mapping in the northern aquifer alluvial system of the river Tagus (Portugal) using Disjunctive Kriging

Cited by 42 publications

References 30 publications

Geostatistical analysis of tritium, groundwater age and other noble gas derived parameters in California

Geostatistical analysis of tritium, groundwater age and other noble gas derived parameters in California

Monitoring of Groundwater Chemical Composition in Areas of Crop Production

An application of MC-SDSS for water supply management during a drought crisis

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