Grid-based modelling of nutrient inputs from diffuse and point sources for the state of North Rhine-Westphalia (Germany) as a tool for river basin management according to EU-WFD

Tetzlaff, Björn; Haider, J.M.; Kreins, Peter; Kuhr, Petra; Kunkel, Ralf; Wendland, Frank

doi:10.1127/1868-5749/2013/0060

Cited by 7 publications

(7 citation statements)

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“…Scenario LIC also produced very good results since the high risk areas ended, the moderate risk areas decreased in 22 %, while the low risk areas increased in 55 %. Similar results were found by Tetzlaff et al (2013) for the North Rhine-Westphalia (Germany) and Malagó et al (2019) for the Mediterranean river basins. These authors showed that a 50 % decrease of nitrogen surplus on cropland and grass land in the Mediterranean river basins would entail more than 20 % reduction of nitrogen input to coastal waters.…”

Section: Spatially Targeted Scenario Analysissupporting

confidence: 84%

Translating the agricultural N surplus hazard into groundwater pollution risk: Implications for effectiveness of mitigation measures in nitrate vulnerable zones

Cameira

Rolim

Valente

et al. 2021

Agriculture, Ecosystems & Environment

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In the Nitrate Vulnerable Zones farmers are required to implement measures to reduce the nitrogen (N) surplus. Nevertheless, in some cases the status of the water bodies show that the effect of these measures remains insufficient despite the global decrease in N surpluses. The present work aims to contribute with a method that produces an appropriate indicator for the N mitigation measures effectiveness for reducing groundwater nitrate pollution. The Global Risk Index (GRI) results from overlaying the agricultural N surplus hazard and aquifer vulnerability. It includes both irrigation activity and precipitation contribution to water recharge calculated at the municipality level. It integrates a range of regional datasets combined with monitored nitrate (NO 3 − ) concentrations in groundwater under a GIS framework. Results show that the pollution status of the Tagus Vulnerable Zone (TVZ) aquifers has been aggravating in spite of the overall reduction in the N surpluses that resulted from the implementation of the Nitrates Directive measures. Twelve years after the TVZ designation, the GRI indicates high and moderate NO 3 -pollution risk, respectively in 33 % and 66 % of the territory. Scenario analysis indicates the potential of targeted measures for ending high risk areas and reducing moderate risk areas to 13 %. This supports that N mitigation measures must be reformulated and spatially targeted according to site specific hazards and vulnerabilities.

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Section: Spatially Targeted Scenario Analysissupporting

confidence: 84%

Translating the agricultural N surplus hazard into groundwater pollution risk: Implications for effectiveness of mitigation measures in nitrate vulnerable zones

Cameira

Rolim

Valente

et al. 2021

Agriculture, Ecosystems & Environment

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“…Applications of the GROWA model in Germany have proved that plausible grid-related BFI values can be determined in the way described (Kunkel et al 2006;Herrmann et al 2009;Wendland et al 2010;Tetzlaff et al 2013a). Bias in the calibrated BFI values can result from two major sources: First, anthropogenic impacts on the discharge disturb the ''natural'' situation which is in the focus of the model.…”

Section: Environ Earth Scimentioning

confidence: 97%

“…Or they are principal for groundwater quality studies, when groundwater is a relevant pathway for pollution, e.g. Tetzlaff et al (2013a, b), Andjelov et al (2014), Celen et al (2014, Kuhr et al (2013), Zupanc et al (2011. In any case, scientists and practitioners involved in large scale investigations have to cope with data scarcity problems, especially for soil and geological parameters, while precipitation, land use and elevation data are already available at high resolution, at least for most European regions.…”

Section: State Of the Art In Model-based Groundwater Assessments At Lmentioning

confidence: 98%

“…GROWA model results are used for issues related to practical water resources management, e.g. the granting of permits to abstract groundwater on a regional level and for status reviews of groundwater bodies according to the EU WFD (Tetzlaff and Wendland 2008;Tetzlaff et al 2009c) or to simulate runoff as a prerequisite for nutrient transport modelling (Tetzlaff and Wendland 2012;Tetzlaff et al 2013a;Andjelov et al 2014).…”

Section: Environ Earth Scimentioning

confidence: 99%

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Model-based assessment of groundwater recharge in Slovenia

et al. 2015

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The implementation process of the EU water legislation (EU WFD, EU GWD) has put pressure on environmental managers to create, analyse and disseminate hydrological data in recent years. In this context, distributed hydrological model results at the macro scale ([10,000 km 2 ) have gained importance for the Environment Agency of the Republic of Slovenia, too. Within a joint project the distributed water balance model GROWA, developed for Germany, has been adapted to Slovenia by re-calibrating the routine for determining the average annual groundwater recharge rate. This routine consists mainly of a base flow index approach (BFI). This BFI is based on 41 different site conditions in Slovenia, whereas lithology dominates the recharge process. This paper outlines the general GROWA approach, the required input data, and the calibration process. Validated model results for the period 1971-2000, especially total runoff and base flow, are presented and discussed. These results have been used already for practical water management issues in Slovenia on European, national and regional level. It is shown that Slovenian groundwater resources exhibit high regional and seasonal variability. Tendencies of more frequent and more pronounced droughts have been detected. As demonstrated by the results GROWA is a valuable tool for the spatially distributed assessment of groundwater recharge in Slovenia.

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“…Due to the federal political structure in Germany, the 16 German states are responsible for the implementation of the EU Directives in the water sector [4]. In Schleswig-Holstein, the input of phosphorus into surface waters presents a substantial problem [5].…”

Section: Introductionmentioning

confidence: 99%

Implementing a Statewide Deficit Analysis for Inland Surface Waters According to the Water Framework Directive—An Exemplary Application on Phosphorus Pollution in Schleswig-Holstein (Northern Germany)

Tetzlaff

Trepel

et al. 2020

Water

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Deficit analysis—which principally deals with the question “how big are the gaps between current water status and good ecological status?”—has become an essential element of the river basin management plans prescribed by the European Water Framework Directive (WFD). In a research project on behalf of the Ministry of Energy, Agriculture, the Environment, Nature and Digitalization Schleswig-Holstein (MELUND), a deficit analysis based on distributed results from the water balance and phosphorus emission model system GROWA-MEPhos at high spatial resolution was performed. The aim was, inter alia, to identify absolute and relative required reduction in total phosphorus at any river segment or lake within the state territory as well as to highlight significant emission sources. The results of the deficit analysis were successfully validated and show an exceedance of the phosphorus target concentrations in 60% of the analyzed subcatchments. Statewide, 269 tons of phosphorus needs to be reduced yearly, which corresponds to approximately 31% of the total emission. Detailed data as well as maps generated by the deficit analysis benefit the planning and implementation of regionally efficient measures, which are indispensable with regard to meeting the environmental quality objectives set by the WFD.

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Grid-based modelling of nutrient inputs from diffuse and point sources for the state of North Rhine-Westphalia (Germany) as a tool for river basin management according to EU-WFD

Cited by 7 publications

References 0 publications

Translating the agricultural N surplus hazard into groundwater pollution risk: Implications for effectiveness of mitigation measures in nitrate vulnerable zones

Translating the agricultural N surplus hazard into groundwater pollution risk: Implications for effectiveness of mitigation measures in nitrate vulnerable zones

Model-based assessment of groundwater recharge in Slovenia

Implementing a Statewide Deficit Analysis for Inland Surface Waters According to the Water Framework Directive—An Exemplary Application on Phosphorus Pollution in Schleswig-Holstein (Northern Germany)

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