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Categorical indicator kriging for assessing the risk of groundwater nitrate pollution: the case of Vega de Granada aquifer (SE Spain)

Categorical indicator kriging for assessing the risk of groundwater nitrate pollution: the case of Vega de Granada aquifer (SE Spain)
Categorical indicator kriging for assessing the risk of groundwater nitrate pollution: the case of Vega de Granada aquifer (SE Spain)
Groundwater nitrate pollution associated with agricultural activity is an important environmental problem in the management of this natural resource, as acknowledged by the European Water Framework Directive. Therefore, specific measures aimed to control the risk of water pollution by nitrates must be implemented to minimise its impact on the environment and potential risk to human health. The spatial probability distribution of nitrate contents exceeding a threshold or limit value, established within the quality standard, will be helpful to managers and decision-makers.

A methodology based on non-parametric and non-linear methods of Indicator Kriging was used in the elaboration of a nitrate pollution categorical map for the aquifer of Vega de Granada (SE Spain). The map has been obtained from the local estimation of the probability that a nitrate content in an unsampled location belongs to one of the three categories established by the European Water Framework Directive: CL. 1 good quality [Min — 37.5 ppm], CL. 2 intermediate quality [37.5–50 ppm] and CL. 3 poor quality [50 ppm — Max].

The obtained results show that the areas exceeding nitrate concentrations of 50 ppm, poor quality waters, occupy more than 50% of the aquifer area. A great proportion of the area's municipalities are located in these poor quality water areas. The intermediate quality and good quality areas correspond to 21% and 28%, respectively, but with the highest population density. These results are coherent with the experimental data, which show an average nitrate concentration value of 72 ppm, significantly higher than the quality standard limit of 50 ppm. Consequently, the results suggest the importance of planning actions in order to control and monitor aquifer nitrate pollution.
0048-9697
229-239
Chica-Olmo, Mario
ff64f393-e295-440b-8d31-ca6964ee7c33
Luque-Espinar, Juan Antonio
f466a352-0583-4b02-8e84-76ab0ee0b155
Rodriguez Galiano, Victor F.
88495556-2795-456d-b972-31ca79fe4a71
Pardo-Igúzquiza, Eulogio
bbac6d80-cc4a-4aa7-84c5-4f11bc1844e9
Chica-Rivas, Lucía
6024f6a9-04aa-41bb-a236-0cbbda3e82e2
Chica-Olmo, Mario
ff64f393-e295-440b-8d31-ca6964ee7c33
Luque-Espinar, Juan Antonio
f466a352-0583-4b02-8e84-76ab0ee0b155
Rodriguez Galiano, Victor F.
88495556-2795-456d-b972-31ca79fe4a71
Pardo-Igúzquiza, Eulogio
bbac6d80-cc4a-4aa7-84c5-4f11bc1844e9
Chica-Rivas, Lucía
6024f6a9-04aa-41bb-a236-0cbbda3e82e2

Chica-Olmo, Mario, Luque-Espinar, Juan Antonio, Rodriguez Galiano, Victor F., Pardo-Igúzquiza, Eulogio and Chica-Rivas, Lucía (2014) Categorical indicator kriging for assessing the risk of groundwater nitrate pollution: the case of Vega de Granada aquifer (SE Spain). Science of the Total Environment, 470-471, 229-239. (doi:10.1016/j.scitotenv.2013.09.077).

Record type: Article

Abstract

Groundwater nitrate pollution associated with agricultural activity is an important environmental problem in the management of this natural resource, as acknowledged by the European Water Framework Directive. Therefore, specific measures aimed to control the risk of water pollution by nitrates must be implemented to minimise its impact on the environment and potential risk to human health. The spatial probability distribution of nitrate contents exceeding a threshold or limit value, established within the quality standard, will be helpful to managers and decision-makers.

A methodology based on non-parametric and non-linear methods of Indicator Kriging was used in the elaboration of a nitrate pollution categorical map for the aquifer of Vega de Granada (SE Spain). The map has been obtained from the local estimation of the probability that a nitrate content in an unsampled location belongs to one of the three categories established by the European Water Framework Directive: CL. 1 good quality [Min — 37.5 ppm], CL. 2 intermediate quality [37.5–50 ppm] and CL. 3 poor quality [50 ppm — Max].

The obtained results show that the areas exceeding nitrate concentrations of 50 ppm, poor quality waters, occupy more than 50% of the aquifer area. A great proportion of the area's municipalities are located in these poor quality water areas. The intermediate quality and good quality areas correspond to 21% and 28%, respectively, but with the highest population density. These results are coherent with the experimental data, which show an average nitrate concentration value of 72 ppm, significantly higher than the quality standard limit of 50 ppm. Consequently, the results suggest the importance of planning actions in order to control and monitor aquifer nitrate pollution.

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More information

Published date: February 2014
Organisations: Global Env Change & Earth Observation

Identifiers

Local EPrints ID: 360092
URI: http://eprints.soton.ac.uk/id/eprint/360092
ISSN: 0048-9697
PURE UUID: 6e687c5d-9651-4c19-a802-c6e34392e993

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Date deposited: 25 Nov 2013 13:50
Last modified: 14 Mar 2024 15:33

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Contributors

Author: Mario Chica-Olmo
Author: Juan Antonio Luque-Espinar
Author: Victor F. Rodriguez Galiano
Author: Eulogio Pardo-Igúzquiza
Author: Lucía Chica-Rivas

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