Abstract
This paper is the result of a study which was carried out in order to verify if the traditional methods to evaluate the intrinsic vulnerability or vulnerability related parameters, are able to clarify the problem of nitrate pollution in groundwater. In particular, the aim was to evaluate limitations and problems connected to aquifer vulnerability methods applied to nitrate contamination prevision in groundwater. The investigation was carried out by comparing NO3 − concentrations, measured in March and November 2004 in the shallow aquifer, and the vulnerability classes, obtained by using GOD and TOT methods. Moreover, it deals with a comparison between NO3 − concentrations and single parameters (depth to water table, land use and nitrogen input). The study area is the plain sector of Piemonte (Northern Italy), where an unconfined aquifer nitrate contamination exists. In this area the anthropogenic presence is remarkable and the input of N-fertilizers and zootechnical effluents to the soil cause a growing amount of nitrates in groundwater. This approach, used in a large area (about 10,000 km2) and in several monitoring wells (about 500), allowed to compare the efficiency of different vulnerability methods and to verify the importance of every parameter on the nitrate concentrations in the aquifer. Furthermore it allowed to obtain interesting correlations in different hydrogeological situations. Correlations between depth to water table, land use and nitrogen input to the soil with nitrate concentrations in groundwater show unclear situations: in fact these comparisons describe the phenomenon trend and highlight the maximum nitrate concentrations for each circumstance but often show wide ranges of possible nitrate concentrations. The same situation could be observed by comparing vulnerability indexes and nitrate concentrations in groundwater. These results suggest that neither single parameters nor vulnerability methods (GOD and TOT) are able to describe individually the complex phenomena affecting nitrate concentrations in soil, subsoil and groundwater. In particular, the traditional methods for vulnerability analysis do not analyze physical processes in aquifers, such as denitrification and nitrate dilution. According to a recent study in the shallow unconfined aquifer of the Piemonte plain, dilution can be considered as the main cause for nitrate attenuation in groundwater.
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References
ASTM (2002) Standard guide for selection of methods for assessing ground water or aquifer sensitivity and vulnerability. ASTM D6030-96, Philadelphia, ASTM
Baker D, Wallrabenstein L, Richards R (1994) Well vulnerability and agricultural contamination: assessments from a voluntary well testing program. In: Weigmann D (ed) Proceedings of the fourth national conference on pesticides: new directions in research, development and policy. Virginia Water Resources Center, Blacksburg, Virginia
Bekesi G, McConchie J (2002) The use of aquifer-media characteristics to model vulnerability to contamination, Manawatu region, New Zealand. Hydrogeol J 10:322–331
Bove A, Casaccio D, Destefanis E, De Luca DA, Lasagna M, Masciocco L, Ossella L, Tonussi M (2005) Idrogeologia della pianura piemontese “Hydrogeology of Piemonte plain”. Regione Piemonte, Mariogros Industrie Grafiche S.p.A., Torino, 15 p. +1 CD Rom
Clark I, Fritz P (1997) Environmental isotopes in hydrogeology. Lewis Publishers, New York, pp 328
Debernardi L, De Luca DA, Lasagna M (2005) Il processo di denitrificazione naturale nelle acque sotterranee in Piemonte “Natural denitrification in groundwater in the western sector of the Po Plain (northern Italy)”. Proceedings of Aquifer vulnerability and Risk, 2nd International Workshop and 4th National Congress on the Protection and Management of Groundwater—Reggia di Colorno (PR), Italy, 21–23 September 2005, Paper ID 176, 27 pp
De Luca DA, Lasagna M (2005) Aquifer role in reducing nitrate contamination by means of the dilution process. In: Proceedings of the 6th international conference “Sharing a common vision of our water resources”, Menton, France, 7–10 September 2005, Paper EWRA066c, 17 pp
De Luca DA, Verga G (1991) Una metodologia per la valutazione della vulnerabilità degli acquiferi “A methodology to evaluate aquifer vulnerability”. Acque Sotter 29:30–33
Decreto Legislativo (2006) No. 152/2006. Norme in materia ambientale. Suppl. Ord. n. 96 G.U. n. 88 del 14/4/2006
EEA (1999) Groundwater quality and quantity in Europe. Environmental assessment report No 3. European Environment Agency, Copenhagen
Evans TA, Maidment DR (1995) A spatial and statistical assessment of the vulnerability of Texas groundwater to nitrate contamination. CRWR Online Report 95-4, http://www.crwr.utexas.edu/gis/gishydro00/library/evans/rep95_4.htm
Firestone MK (1982) Biological denitrification. Nitrogen agricolture soils. In: Stevenson FJ (ed) pp 289–326. American Society of Agronomy, Madison
Foster S, Hirata R (1988) Groundwater pollution risk assessment. World Health Organization. Pan American Health Organization. Pan American Center for Sanitary Engineering and Environmental Sciences (CEPIS). Lima, Perú. 79 pp
Foster S, Hirata R, Gomes D, D’Elia M, Paris M (2002) Groundwater quality protection: a guide for water utilities, municipal authorities and environment agencies. World Bank Publication: Washington, USA, pp 103
GAO (General Accounting Office) (1992) Groundwater protection: validity and feasibility of EPA’s differential protection strategy. (GAO/PEMD-93-6). General Accounting Office, Washington
Grignani C, Zavattaro L, Sacco D, Bassanino M (2005) A territorial survey to describe mineral N fertilization management in Piedmont (Northern Italy). In: Proceedings of the 14th N-Workshop “N management in agro-systems in relation to the water framework directive”, Maastricht (NL), 24–26 October 2005
Hill AR (1996) Nitrate removal in stream riparian zones. J Environ Qual 25:743–755
Kölle W, Werner P, Strebel O, Böttcher J (1983) Denitrification by pyrite in a reducing aquifer (in German). Vom Wasser 61(1):125–147
Koplin DW (1997) Agricultural chemicals in groundwater of the midwestern United States: relations to land use. J Environ Qual 26:1025–1037
Korom SF (1992) Natural denitrification in the saturated zone: a review. Water Resour Res 28: 1657–1668
Lasagna M (2006) I nitrati nelle acque sotterranee della pianura piemontese: distribuzione, origine, attenuazione e condizionamenti idrogeologici “Nitrate in Piemonte plain groundwater: distribution, origin, attenuation and hydrogeological conditioning”. PhD Thesis, Earth Science Department, University of Torino, Italy, 350 pp
Lasagna M, De Luca DA, Sacchi E, Bonetto S (2006) Studio dell’origine dei nitrati nelle acque sotterranee piemontesi mediante gli isotopi dell’azoto “Study of nitrate origin in Piemonte groundwater using nitrogen isotopes”. Giornale di geologia applicata 2 (2005), pp 137–143
McLay CDA, Dragten R, Sparling G, Selvarajah N (2001) Predicting groundwater nitrate concentrations in a region of mixed agricultural land use: a comparison of three approaches. Environ Pollut 115:191–204
Minnesota Pollution Control Agency, Ground Water and Toxic Unit (1998) Nitrate in Minnesota ground water. A GWMAP perspective. 52 pp
Nightingale H, Bianchi W (1980) Correlation of selected well water quality parameters with soil and aquifer hydrologic properties. Water Resour Bull 16(4):702–709
Nolan BT, Ruddy BC, Hitt KJ, Helsel DR (1998) A national look at nitrate contamination of ground water. Water Cond Purif 39:76–79
Nolan BT, Stoner JD (2000) Nutrients in groundwaters of the conterminous United States, 1992–1995. Environ Sci Technol 34:1156–1165
Poinke HB, Urban JB (1985) Effect of agricultural land-use on groundwater quality in a small Pennsylvania watershed. Ground Water 23:68–80
Postma D, Boesen C, Kristiansen H, Larsen F (1991) Nitrate reduction in an unconfined aquifer: water chemistry, reduction processes, and geochemical modeling. Water Resour Res 27:2027–2045
Regione Piemonte 1988. Land use 1:100000. Available at: http://gis.csi.it/scripts/esrimap.dll?name=Rd&Cmd=ScaD&Sezione=All&IdD=27&Idu=&Indice=All. Accessed 20 July 2006
Sacco D, Zavattaro L, Grignani C (2006) Regional-scale predictions of agricultural n losses in an area with a high livestock density. Ital J Agron 4:689–703
Spalding RF, Exner ME (1993) Occurrence of nitrate in groundwater: a review. J Environ Qual 22:392–402
Starr RC, Gillham RW (1993) Denitrification and organic carbon availability in two aquifers. Ground Water 31(6):934–947
Stigter TY, Ribeiro L, Carvalho Dill AMM (2006) Evaluation of an intrinsic and a specific vulnerability assessment method in comparison with groundwater salinisation and nitrate contamination levels in two agricultural regions in the south of Portugal. Hydrogeol J 14:79–99
Thomasson AJ, Bouma J, Leith H (eds) (1991) Soil and Groundwater Research Report. II. Nitrate in Soils. EUR13501 Office for Official Publications of the European Communities, Luxembourg, pp 544
Tiedje JM, Sextone AJ, Myrold DD, Robinson JA (1982) Denitrification: ecological niches, competition and survival. Antonie van Leeuwenhoek 48:569–583
Zampetti M (1983) Informazioni e dati relativi alla quantità ed alla qualità delle acque sotterranee nella Comunità Europea. In: Proceedings of the international conference inquinamento delle Acque sotterranee da Composti organo-clorurati di Origine industriale. Milano, pp 197–204
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Debernardi, L., De Luca, D.A. & Lasagna, M. Correlation between nitrate concentration in groundwater and parameters affecting aquifer intrinsic vulnerability. Environ Geol 55, 539–558 (2008). https://doi.org/10.1007/s00254-007-1006-1
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DOI: https://doi.org/10.1007/s00254-007-1006-1