Model based impact analysis of policy options aiming at reducing diffuse pollution by agriculture—a case study for the river Ems and a sub-catchment of the Rhine

Gömann, Horst; Kreins, Peter; Kunkel, Ralf; Wendland, Frank

doi:10.1016/j.envsoft.2004.01.004

Cited by 47 publications

(22 citation statements)

References 2 publications

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“…In the pasture lands, cow is dominant animal that has been grazing mainly in summer season. Average livestock (LU) density obtained from local people consultation and other literatures is estimated to be 2 LU ha −1 (Kreins et al 2003;Gömann et al 2005). Data of average monthly nutrient taken from the six wastewater treatment plants from (Kreis Schleswig-Flensburg 2009 were implemented as point sources in the model.…”

Section: Model Inputsmentioning

confidence: 99%

The impact of agricultural Best Management Practices on water quality in a North German lowland catchment

Lam

Schmalz

Fohrer

2011

Environ Monit Assess

147

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Research on water quality degradation caused by point and diffuse source pollution plays an important role in protecting the environment sustainably. Implementation of Best Management Practices (BMPs) is a conventional approach for controlling and mitigating pollution from diffuse sources. The objectives of this study were to assess the long-term impact of point and diffuse source pollution on sediment and nutrient load in a lowland catchment using the ecohydrological model Soil and Water Assessment Tool (SWAT) and to evaluate the cost and effectiveness of BMPs for water quality improvement in the entire catchment. The study area, Kielstau catchment, is located in the North German lowlands. The water quality is not only influenced by the predominating agricultural land use in the catchment as cropland and pasture, but also by six municipal wastewater treatment plants. Diffuse entries as well as punctual entries from the wastewater treatment plants are implemented in the model set-up. Results from model simulations indicated that the SWAT model performed satisfactorily in simulating flow, sediment, and nutrient load in a daily time step. Two approaches to structural and nonstructural BMPs have been recommended in relation to cost and effectiveness of BMPs in this study. These BMPs include extensive land use management, grazing management practice, field buffer strip, and nutrient management plan. The results showed that BMPs would reduce fairly the average annual load for nitrate and total nitrogen by 8.6% to 20.5%. However, the implementation of BMPs does not have much impact on reduction in the average annual load of sediment and total phosphorus at the main catchment outlet. The results obtained by implementing those BMPs ranged from 0.8% to 4.9% and from 1.1% to 5.3% for sediment and total phosphorus load reduction, respectively. This study also reveals that reduction only in one type of BMP did not achieve the target value for water quality according to the European Water Framework Directive. The combination of BMPs improved considerably water quality in the Kielstau catchment, achieving a 53.9% and a 46.7% load reduction in nitrate and total nitrogen load, respectively, with annual implementation cost of 93,000 Euro.

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Section: Model Inputsmentioning

confidence: 99%

The impact of agricultural Best Management Practices on water quality in a North German lowland catchment

Lam

Schmalz

Fohrer

2011

Environ Monit Assess

147

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“…This incorporation often relies on the assumption of profit maximization (e.g. Ahrends et al, 2008;deVoil et al, 2006;Gömann et al, 2005). However, farmers do not only seek to maximize profits but also try to secure their incomes by minimizing risks (e.g.…”

Section: Introductionmentioning

confidence: 99%

Expanding risk consideration in integrated models – The role of downside risk aversion in irrigation decisions

Finger

2013

Environmental Modelling & Software

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“…The long-term nitrogen balance averaged over several vegetation periods is calculated considering the organic nitrogen fertilization, the mineral nitrogen fertilization, the symbiotic N-fixation, the atmospheric N-inputs and the N-extractions with the crop substance. As a rule, the difference between nitrogen supplies, primarily by mineral fertilizers and farm manure, and nitrogen extractions, primarily by field crops, leads to a positive N-balance (Gömann et al, 2004).…”

Section: Model Toolsmentioning

confidence: 99%

Determination and ranking of target areas in catchments for the implementation of nitrogen reduction measures

Tetzlaff¹,

Kunkel

Schäfer

et al. 2007

Adv. Geosci.

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Abstract. The implementation of the EU Water Framework Directive (EU-WFD) forms the background of the WAgriCoproject (Water Resources Management in Cooperation with Agriculture). WagriCo concentrates on the development of nitrogen management options adapted to hydrological and agro-economic site conditions and at demonstrating new participation approaches and technologies suitable for settingup programmes of measures. The article outlines the conceptual model approach and its application in the pilot region "Große Aue" (Northern Germany). Furthermore the process of delineating priority areas is described, which act as spatial targets for the adaptation of regionally differentiated nutrient reduction measures.

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Model based impact analysis of policy options aiming at reducing diffuse pollution by agriculture—a case study for the river Ems and a sub-catchment of the Rhine

Cited by 47 publications

References 2 publications

The impact of agricultural Best Management Practices on water quality in a North German lowland catchment

The impact of agricultural Best Management Practices on water quality in a North German lowland catchment

Expanding risk consideration in integrated models – The role of downside risk aversion in irrigation decisions

Determination and ranking of target areas in catchments for the implementation of nitrogen reduction measures

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