Project within IP Catchment Dynamics
Scope and Mission
Worldwide, nitrogen losses from intensive agricultural production and nitrogen inputs from treated or untreated wastewater may reach the hydrological system and end up as unwanted high loads of nitrate in surface water and groundwater with a long-term impact on water quality and on the health of associated ecosystems. High nitrate loads can cause severe eutrophication of groundwater-dependent or surface-runoff-fed ecosystems such as wetlands, rivers and near-coastal areas. Despite these current nitrate pollution problems ongoing global change manifested by rapid shifts of climate and land use may further worsen nitrate threats. For example, our main drinking water resources are threatened as ongoing nitrate inputs deteriorate the quality of groundwater in aquifers used for drinking water production.
Especially the latter fact has caught much attention lately, because Germany was taken to the European Court of Justice and sued over exceeding nitrate limits in groundwater. As a consequence, Germany is going to face considerable fines as high as €850,000 per day if no appropriate measures are taken to lower the nitrate concentrations in groundwater.
Our main motivation to do research on nitrate in the hydrological system is to develop concepts for mechanistic tools that:
(1) Help predict future nitrate concentrations in the hydrological system and
(2) Support regulators and authorities in estimating the effectiveness of measures taken to control nitrate pollution.
Our scientific approach will consider and focus on:
(1) Identifying and predicting land to stream flow and nitrate transfer pathways
(2) Recognizing and quantifying prevailing biogeochemical processes and matrix properties that control mobilization, retention and removal of nitrate in the critical zone, in aquifers, river networks, lakes , and reservoirs as well as their imprint on concentration and loads at the catchment scale
(3) Assessing the impact of hydrological variability (and extreme events) on the fate of nitrate in catchments across scales
(4) Predicting the time gap between nitrate input and nitrate export from catchments or its appearance at certain observation points.
Nitrate research is based on the integration of advanced monitoring techniques and modelling approaches which capture a large range of spatial and temporal scales comprising:
- High frequency monitoring of nitrate and other solute compounds in surface water using advanced in-situ sensor technology
- (High frequency) stable isotope fingerprinting to constrain catchments scale travel times, to delineate nitrogen source contributions and to recognize and quantify prevailing nitrogen turnover processes
- Data driven modelling for identifying dominant transport processes and time lags between input and output signals at the catchment scale as well as long term multi decadal shifts of nitrate loadings
- Deterministic hydrological nitrate modelling for evaluating spatially distributed loading and transport and attenuation processes at catchment scale
Outcomes and Outreach
Tools or tool components that help predict future nitrate concentrations in the hydrological system and that support regulators and authorities in assessing the impact of climate and land use change and estimating the effectiveness of measures taken to control nitrate pollution. Within the project we collaborate nationally (e.g. TU Darmstadt, University Koblenz-Landau) and internationally (e.g. University of Florida, University of Toronto).
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