Pollutant Spreading in a Small Stream: A Case Study in Mala Nitra Canal in Slovakia

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• 作者：Yvetta Velísková ; Marek Soká? ; Peter Halaj ; Márta Koczka Bara…
• 关键词：Dispersion coefficient ; Field tracer experiments ; Dimensionless dispersion coefficient ; Numerical simulation ; Pollutant spreading
• 刊名：Environmental Processes
• 出版年：2014
• 出版时间：September 2014
• 年：2014
• 卷：1
• 期：3
• 页码：265-276
• 全文大小：961KB
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• 作者单位：Yvetta Velísková (1)
  Marek Soká? (2)
  Peter Halaj (3)
  Márta Koczka Bara (1)
  Renáta Dulovi?ová (1)
  Radoslav Schügerl (1)
  
  1. Institute of Hydrology, Slovak Academy of Sciences, Bratislava, Slovakia
  2. Department of Sanitary and Environmental Engineering, Slovak University of Technology, Bratislava, Slovakia
  3. Department of Landscape Engineering, Slovak Agricultural University, Nitra, Slovakia
  
• 刊物类别：Environmental Science and Engineering; Environmental Management; Waste Management/Waste Technology;
• 刊物主题：Environmental Science and Engineering; Environmental Management; Waste Management/Waste Technology; Water Quality/Water Pollution;
• 出版者：Springer International Publishing
• ISSN：2198-7505

文摘

The Water Framework Directive requires as an obligatory goal to achieve and to keep “good water quality-status within the defined period (for Slovakia—up to the year 2015). For surface waters, the main criterion is the ecological and chemical status of the water. Mathematical and numerical modelling allows evaluating various situations of contaminants spreading in rivers (from everyday wastewater disposal through fatal accidents and discharges of the toxic substances) without immediate destructive impact to the environment. Determination of longitudinal and transverse dispersion coefficient values, as the main hydrodynamic characteristics of the dispersion, has the highest extent of uncertainty for hydrodynamic models simulating pollutant transport in streams. This paper deals with the determination of dispersion coefficients based on field tracer experiments performed in a small modified stream (basic hydrodynamic parameters during the experiments were: discharge Q--.138-.553 m3.s?, depth h--.29-.48 m, width B--.2-.9 m). During the experiments, various conditions and situations were taken into account, e.g., continuous and instantaneous pollution source, as well as various positions of pollution source along the river width, among others. Field measurements were evaluated using three different methods for dispersion coefficient determination: based on statistical evaluation, based on analytical solutions of advection–dispersion equation, and using numerical models. The dimensionless dispersion coefficients values were determined, which can be used for numerical simulation of pollutant transport in similar types of streams. Keywords Dispersion coefficient Field tracer experiments Dimensionless dispersion coefficient Numerical simulation Pollutant spreading