The prediction and management of aquatic nitrogen pollution across Europe: an introduction to the Integrated Nitrogen in European Catchments project (INCA)

Abstract. Excess nitrogen in soils, fresh water, estuarine and marine systems contributes to nutrient enrichment in key ecosystems throughout Europe, often leading to detrimental environmental impacts, such as soil acidification or the eutrophication of water bodies. The Integrated Nitrogenmodel for European Catchments (INCA) project aims to develop a generic version of the Integrated Nitrogen in Catchments (INCA) model to simulate the retention and transport of nitrogen within river systems, thereby providing a tool to aid the understanding of nitrogen dynamics and for river-basin management/policy-making. To facilitate the development of the model, 10 partners have tested the INCA model with data collected in study sites located in eight European countries as part of the INCA project. This paper summarises the key nitrogen issues within Europe, describes the main aims and methodology of the INCA project, and sets the project in the context of the current major research initiatives at a European level. Keywords: Europe, European Union, nitrogen, nitrate, ammonium, river basin management, modelling, water chemistry, acidification, eutrophication, Water Framework Directive, INCA.

[1]  Ø. Kaste,et al.  Nitrogen dynamics in runoff from two small heathland catchments representing opposite extremes with respect to climate and N deposition in Norway , 2002 .

[2]  Paul Whitehead,et al.  Quality simulation along river systems (QUASAR): model theory and development , 1997 .

[3]  B. Emmett,et al.  Nitrogen additions (NaNO3 and NH4NO3) at Aber forest, Wales: II. Response of trees and soil nitrogen transformations , 1995 .

[4]  Gregory M. Perry,et al.  The On-Farm Costs of Reducing Groundwater Pollution , 1991 .

[5]  Lucy O'Shea,et al.  An economic approach to reducing water pollution: point and diffuse sources. , 2002, The Science of the total environment.

[6]  Véronique Beaujouan,et al.  Modelling the effect of the spatial distribution of agricultural practices on nitrogen fluxes in rural catchments , 2001 .

[7]  Robert D. Weaver,et al.  Efficacy of Standards vs. Incentives for Managing the Environmental Impacts of Agriculture , 1996 .

[8]  Richard E. Howitt,et al.  Positive Mathematical Programming , 1995 .

[9]  A. W. Morris,et al.  Rivers and coastal research in the Land Ocean Interaction Study , 1997 .

[10]  G. Hornberger,et al.  Modeling the Effects of Acid Deposition: Assessment of a Lumped Parameter Model of Soil Water and Streamwater Chemistry , 1985 .

[11]  P. Whitehead,et al.  Nitrous oxide emission from a range of land uses across Europe , 2002 .

[12]  Gouldson.  EUROPE'S ENVIRONMENT: THE DOBRIS ASSESSMENT , 1996 .

[13]  A. Wade,et al.  Excess nitrogen leaching and C/N decline in the Tillingbourne catchment, southern England , 2002 .

[14]  M. Schaap,et al.  Spatial variability of throughfall water and chemistry and forest floor water content in a Douglas fir forest stand , 2002 .

[15]  Charles T. Driscoll,et al.  Application of pnet-cn/chess to a spruce stand in Solling, Germany , 1995 .

[16]  A. Edwards,et al.  Modelling instream nitrogen variability in the Dee catchment, NE Scotland. , 2001, The Science of the total environment.

[17]  J. H. M. Thornley,et al.  Nitrogen Relations in a Forest Plantation—Soil Organic Matter Ecosystem Model , 1992 .

[18]  P. Loveland,et al.  An empirical map of critical loads of acidity for soils in Great Britain. , 1995, Environmental pollution.

[19]  A. Butturini,et al.  Nitrogen concentrations in a small Mediterranean stream: 1. Nitrate 2. Ammonium , 2002 .

[20]  B. Cosby,et al.  A dynamic model for assessing the impact of coupled sulphur and nitrogen deposition scenarios on surface water acidification , 1997 .

[21]  Andrew P. Whitmore,et al.  Computer simulation of changes in soil mineral nitrogen and crop nitrogen during autumn, winter and spring , 1987, The Journal of Agricultural Science.

[22]  E. Matzner,et al.  Long-term modelling of nitrogen turnover and critical loads in a forested catchment using the INCA model , 2002 .

[23]  E. J. Wilson,et al.  A semi-distributed integrated flow and nitrogen model for multiple source assessment in catchments (INCA): Part II — application to large river basins in south Wales and eastern England , 1998 .

[24]  A. Butturini,et al.  The influence of riparian-hyporheic zone on the hydrological responses in an intermittent stream , 2002 .

[25]  Keith Beven,et al.  Prophecy, reality and uncertainty in distributed hydrological modelling , 1993 .

[26]  S. Langan.  The impact of nitrogen deposition on natural and semi-natural ecosystems , 1999 .

[27]  Penny J Johnes,et al.  Evaluation and management of the impact of land use change on the nitrogen and phosphorus load delivered to surface waters: the export coefficient modelling approach , 1996 .

[28]  N Oreskes,et al.  Verification, Validation, and Confirmation of Numerical Models in the Earth Sciences , 1994, Science.

[29]  P. Loveland,et al.  The sensitivity of surface waters of Great Britain to acidification predicted from catchment characteristics. , 1995, Environmental pollution.

[30]  E. J. Wilson,et al.  A semi-distributed ntegrated itrogen model for multiple source assessment in tchments (INCA): Part I — model structure and process equations , 1998 .

[31]  Lars R. Bakken,et al.  Regulating nonpoint-source pollution from agriculture: An integrated modelling analysis , 1997 .

[32]  Véronique Beaujouan,et al.  Effect on nitrate concentration in stream water of agricultural practices in small catchments in Brittany: II. Temporal variations and mixing processes , 2002 .

[33]  R. Ferrier,et al.  Modelling Surface Water Acidification in the UK: Application of the MAGIC model to the Acid Waters Monitoring Network , 1997 .

[34]  G. Hornberger,et al.  Modelling algal behaviour in the river thames , 1984 .

[35]  H. Scholten,et al.  The preparation of a European land use database , 1994 .

[36]  G. Hornberger,et al.  Time scales of catchment acidification. A quantitative model for estimating freshwater acidification. , 1985, Environmental science & technology.

[37]  A. Edwards,et al.  The prediction and management of water quality in a relatively unpolluted major Scottish catchment: current issues and experimental approaches , 1997 .

[38]  Katri Rankinen,et al.  Hydrological application of the INCA model with varying spatial resolution and nitrogen dynamics in a northern river basin , 2002 .

[39]  D. Stanners,et al.  Europe's environment : the Dobrís assessment , 1995 .

[40]  B. Emmett,et al.  Modelling the ecosystem effects of nitrogen deposition: Model of Ecosystem Retention and Loss of Inorganic Nitrogen (MERLIN , 1997 .

[41]  W. A. Virtue,et al.  Modelling nitrogen dynamics and distributions in the River Tweed, Scotland: an application of the INCA model , 2002 .

[42]  E. J. Wilson,et al.  Excess nitrogen deposition: issues for consideration. , 1988, Environmental pollution.

[43]  P. E. O'connell,et al.  An introduction to the European Hydrological System — Systeme Hydrologique Europeen, “SHE”, 1: History and philosophy of a physically-based, distributed modelling system , 1986 .

[44]  Véronique Beaujouan,et al.  A nitrogen model for European catchments: INCA, new model structure and equations , 2002 .

[45]  C. Beier,et al.  A correlative evaluation of nitrogen cycling in the forest ecosystems of the EC projects NITREX and EXMAN , 1995 .

[46]  B. Whitton,et al.  Conclusions to special issue: Water quality and biology of United Kingdom rivers entering the North Sea: The Land Ocean Interaction Study (LOIS) and associated work , 1998 .

[47]  Véronique Beaujouan,et al.  Effect on nitrate concentration in stream water of agricultural practices in small catchments in Brittany: I. Annual nitrogen budgets , 2002 .

[48]  E. Matzner,et al.  N fluxes in two nitrogen saturated forested catchments in Germany: dynamics and modelling with INCA , 2002 .