Results 301 to 310 of about 140,939 (347)
Science of the Total Environment, 2019 Groundwater status in highly urbanized areas is particularly affected by anthropogenic influence due to diffuse pollution deriving from many sources. This makes very often challenging to determine whether the observed groundwater conditions are the result of localized pollutant sources (PS-Point Sources).
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Diffuse atrazine pollution in German aquifers
Biodegradation, 2002Until its prohibition in Germany in 1991, atrazine was the most frequently applied herbicide in maize cultivation. Moreover, it was used in orchards and vineyards and as a total herbicide on non-cultivated grounds (railways, factory grounds). Later on, atrazine was substituted mainly by terbutylazine.
Wolfgang, Tappe +2 more
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Enhanced diffusion of pollutants by self-propulsion
Physical Chemistry Chemical Physics, 2011Current environmental models mostly account for the passive participation of pollutants in their environmental propagation. Here we demonstrate the paradigm-changing concept that pollutants can propagate themselves with a rate that is greater than the rate for standard molecular diffusion by five orders of magnitude.
Guanjia, Zhao +2 more
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Pollution by Diffusive Processes
1973The most serious types of pollution are those following the release of the pollutant from points within or on the boundary of a gaseous or liquid medium. The problems to be considered in this paper relate to the determination of the distribution of the pollutant within the medium and along the boundary of the medium.
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Diffusion of Pollution Prevention Policy
The ANNALS of the American Academy of Political and Social Science, 1999Prevention is growing in importance as a method of reducing industrial pollution, though it is by no means easy to do. Diffusion of the prevention approach may be enhanced by increasing the risks associated with doing nothing or sticking to control technologies, while providing settings where trust can grow.
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Natural Wetlands Treating Diffuse Pollution
2006This chapter presents a case study to assess the temporal and spatial hydraulic and biochemical functioning of groundwater-fed ditch ecosystems and their contribution to the overall catchment and particularly nutrient dynamics of a riparian peatland located in the River Eider Valley.
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The problem of agricultural ‘diffuse’ pollution: Getting to the point
Science of The Total Environment, 2019Despite introduction of legislation such as the EU Nitrates and Water Framework Directives (Directives 91/676/EEC and 2000/60/EC respectively), agricultural practices are often still regarded as a major factor in poor water quality across many EU member states.
Simon, Harrison +3 more
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Introduction to the Diffuse Groundwater Pollution papers
Quarterly Journal of Engineering Geology and Hydrogeology, 2004Diffuse pollution from human activities at the land surface remains a major groundwater quality concern for the UK, for our European partners, in North America and now increasingly in the developing world. The impact on the underlying groundwater of leached nitrogen from the gradual intensification of arable farming was recognized in the 1970s.
John Chilton, Tim Besien
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Pollution diffuse par l'agriculture
1994Par nature, l'activité agricole est à l'origine de pollutions diffuses difficiles à identifier et provoquant des dommages très variés. Dans ces conditions, soit on se trouve dans un régime de responsabilité sans faute, soit on a des difficultés à établir un comportement fautif.
Rainelli, Pierre, Weaver, Robert D.
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Urban air pollution—a diffusion equation model
Mathematical Biosciences, 1975Abstract A mathematical model for the occurrence and diffusive propagation of air pollution in an urban air space is proposed. Using a Green's function of the proposed diffusion equation and a Poissonian emission process, a statistical analysis of the resulting density of air pollution is made.
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