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Hydrology and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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Volume 2, issue 4
Hydrol. Earth Syst. Sci., 2, 533–541, 1998
https://doi.org/10.5194/hess-2-533-1998
© Author(s) 1998. This work is licensed under
the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License.

Special issue: The DYNAMO Project

Hydrol. Earth Syst. Sci., 2, 533–541, 1998
https://doi.org/10.5194/hess-2-533-1998
© Author(s) 1998. This work is licensed under
the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License.

  31 Dec 1998

31 Dec 1998

Regional modelling of acidification in Wales; calibration of a spatially distributed model incorporating land use change

R. Collins and A. Jenkins R. Collins and A. Jenkins
  • Institute of Hydrology, Wallingford, Oxon., UK.

Abstract. The Model of Acidification of Groundwater In Catchments (MAGIC) has been calibrated to 94 catchments in Wales, enabling the quantification of regional response to reduced emissions under the second sulphur protocol and incorporating the potential impact of future changes in afforestation. To calibrate the model the methodology utilises, for each site, the best available data derived from databases which are consistent across the whole region but which vary in spatial resolution. The calibrated model closely matches observed stream water chemistry across the region. The predicted future response is a reduction in acidity of surface waters in the region. The recovery is less marked at forested catchments, and some forested sites undergo a further decrease in acid neutralising capacity (ANC). The predictions from the multiple-site method are statistically consistent with those produced by an alternative regional modelling method which is based upon Monte-Carlo procedures. The multiple-site method, however, has the advantage of providing future predictions which are also spatially distributed across the region.

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