Nachlassender Nitratabbau im Grundwasser und deren Folgen - abgestufte modellgestützte Bewertungsansätze
Abstract
In many water catchment areas, denitrification processes in aquifers ensure lower nitrate contamination in groundwater. The denitrification capacity of aquifers mainly depends on organic carbon and iron disulfide which, being finite resources, are susceptible to depletion. This will generally result in increasing nitrate concentrations in groundwater. Within the scope of a DVGW-supported research project, consequences of a decreasing denitrification capacity in aquifers have been investigated and evaluated in 38 water catchment areas. A scaled four-stage evaluation procedure enables adapting to specific regional settings and assessment requirements. Based on measured and predicted nitrate concentrations in raw water, the "sustainability" of groundwater resources management has been assessed. Hydrogeochemical models and methods of varying complexity were applied. Thus, consequences and risks of nitrate pollution in raw water can be identified and assessed, and effects of groundwater protection measures can be shown.
- Publication:
-
Grundwasser
- Pub Date:
- November 2017
- DOI:
- 10.1007/s00767-017-0373-0
- Bibcode:
- 2017Grund..22..293W
- Keywords:
-
- Denitrification;
- Hydrochemical models;
- Porous aquifers;
- Water supply management