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1

Mathematical model development for non-point source in-stream pollutant transport

Adu Joy, Kumarasamy Muthukrishna Vellaisamy

Archives of Environmental Protection

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2020

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Vol. 46, no. 2

91--99

EN

Non-point source pollution is a primary cause for concern globally. Various models have been developed to tackle this situation with much emphasis placed on best management practices. This practice has, however, proven to be insufficient to solve the NPS pollution situation. Existing non-point source models are watershed- -based and complicated both in operation, parameter estimation and data requirements. A non-point source model is proposed using the concept of the Hybrid Cells in Series model. The model is a three-parameter model made up of three zones, which describes pure advection through time delay in a plug zone, with combined advection and dispersion occurring when the other two zones are considered as thoroughly mixed. The proposed model is tested using synthetic data and field data from the Snake River, Colorado, USA, obtained from literature. Simulations were performed at four sample points; two from the tracer injection point along the Snake River before a confluence and two further downstream after the confluence. A regression analysis was carried out to determine the model’s capability to simulate pollutant transport for the four sampling points. The coefficients of determination are 0.98, 0.94, 0.84 and 0.97 while the standard error for each reach is 2.28E-2, 2.70E-2, 2.32E-2 and 9.35E-3 respectively. The results show good agreement between the measured and the simulated data. The response of the C-t profiles produced by the proposed model for both synthetic and field data demonstrates its ability to effectively simulate pollutant transport in natural rivers subject to non-point source pollution.

2

Migracja zanieczyszczeń w rejonie starego składowiska odpadów z pionową przesłoną przeciwfiltracyjną

Wychowaniak D.

Przegląd Naukowy Inżynieria i Kształtowanie Środowiska

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2013

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Vol. 22, No. 1

45--55

PL

W artykule przedstawiono i zdefiniowano procesy zachodzące w migracji zanieczyszczeń ze składowiska odpadów w nawodnionym ośrodku gruntowym. Omówiono również sposób zabezpieczenia składowiska przed migracją zanieczyszczeń oraz założenia modelu numerycznego przepływu i migracji zanieczyszczeń na przykładzie starego składowiska odpadów „Łubna”. Przeanalizowano wyniki systematycznych badań monitoringowych jakości wód powierzchniowych i podziemnych w rejonie składowiska z okresu przed i po wykonaniu przesłony przeciwfiltracyjnej.

EN

The paper presents and defines the processes of pollutant transport in subsoil. The landfill’s vertical barrier and assumption of numerical model of groundwater flow and pollutant transport are also discussed, based on example of the old sanitary landfill Łubna localized near Warsaw. The water monitoring results of landfill areas, which includes water chemical analyses from the period before and after the vertical barrier was built, is also analyzed in this paper.

3

Modelowanie migracji zanieczyszczeń w strefie saturacji i aeracji metodą elementów skończonych na przykładzie składowiska odpadów komunalnych w Nowym Dworze

Karwacka K., Pazio-Urbanowicz K.

Biuletyn Państwowego Instytutu Geologicznego

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2011

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nr 445 Hydrogeologia z. 12/1

245--254

PL

Badania modelowe migracji zanieczyszczeń dla składowiska odpadów w Nowym Dworze przeprowadzono w celu wykonania wstępnej oceny wpływu tego obiektu na stan jakościowy wód podziemnych. Badania modelowe przeprowadzono z wykorzystaniem oprogramowania GMS/FEMWATER. Rezultatem przeprowadzonych badań było uzyskanie wstępnej prognozy przestrzennego rozkładu zanieczyszczenia dla czterech różnych wariantów infiltracji odcieków po 35, 50 i 100 lat od rozpoczęcia składowania.

EN

Model tests of for pollutant migration in landfills Nowy Dwór performed in order to comply with the preliminary evaluation of the impact of this object to the status of groundwater quality. Model tests were carried out using the software GMS / FEMWATER. Results of the study was to obtain preliminary estimates the spatial distribution of pollutants for the four different options for effluents infiltration after 35, 50 and 100 years since the start of storage.

4

Advection-dispersion pollutant and dissolved oxygen transport as a part of sewage biodegradation model

Łagód G., Sobczuk H., Suchorab Z.

Environment Protection Engineering

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2009

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Vol. 35, nr 3

305-317

EN

The need to simulate the conditions of transport of the pollutants and the dissolved oxygen in the flux of sewage arises in the modelling of sewage biode´gradation process in gravitational sewer system. In the properly kept sewers, sewage flow velocity is generally uniform, which allows the model describing the pollutant transport to be simplified. The application of further simplifying assumptions, justified by the conditions inside the modelled object, allows us to get the credible results with the acceptable efforts. These simplifications can be considered, depending on the costs of data for model calibration measurement and the numerical calculation costs. The present work is focused on finding the most convenient description of transport and transformation of dissolved and suspended substances by the advection-dispersion formulas, being one-dimensional description of sewage flow. The literature review concerning various treatment of longitudinal dispersion coefficient was presented. The influence of flow conditions in the modelled system on the dispersion coefficient was also shown. Finally, the matrix description of pollutant fraction transport and biodegradation in gravitational sanitation conduit based on advection-dispersion equation, along with the example of numerical procedure, was described.

5

Transitional, entraining, cloudy, and coastal boundary layers

Angevine W.

Acta Geophysica

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2008

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Vol. 56, no. 1

2-20

EN

Atmospheric boundary layers are marvelously varied and complex. Recent re-search has examined some of that variety. Boundary layers over land undergo drastic changes throughout the day as the sun rises and sets, and as clouds form and dissipate. Air is entrained at the top of the boundary layer at varying rates. As air moves over the coast, the boundary layer reacts to changes in surface forcing. All of these changes affect pollutant transport and weather formation. In this paper, research attempting to understand transitional, cloud-topped, and coastal boundary layers, and boundary-layer top entrainment, is reviewed.

6

Model przepływu wód podziemnych i transportu zanieczyszczeń dla składowiska z bentonitową przesłoną pionową

Wiencław E., Koda E.

Przegląd Geologiczny

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2005

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Vol. 53, nr 9

770--775

EN

The numerical modelling of groundwater flow and pollutant transport was performed for the old sanitary landfill surrounded by a vertical bentonite barrier. The recirculation system of leachate applied on the landfill was also included in transport modelling. The simulation, using FEMWATER software, aimed at assessment of the vertical bentonite barrier influence on shaping of groundwater level in subsoil on surroundings, as well as estimating the infiltration time of leachate in the waste body during recirculation. The results of groundwater monitoring were used for verification and calibration of the numerical model.