Modelling seasonal changes of longitudinal dispersion at the Okna River
Aim of the study: This study presents an opportunity to determine a value of longitudinal dispersion and is focused on the comparison of seasonal variation of the longitudinal dispersion predetermined by natural conditions of the river aquatic zone. Material and methods: The dispersion of a pol...
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Publishing House of the University of Agriculture in Krakow
2020-06-01
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Online Access: | http://acta.urk.edu.pl/MODELLING-SEASONAL-CHANGES-OF-LONGITUDINAL-DISPERSION-AT-THE-OKNA-RIVER,122201,0,2.html |
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doaj-0562ddca7feb487cacf38af8e9ed096d2021-05-10T12:33:52ZengPublishing House of the University of Agriculture in KrakowActa Scientiarum Polonorum. Formatio Circumiectus1644-07652020-06-01191374610.15576/ASP.FC/2020.19.1.37Modelling seasonal changes of longitudinal dispersion at the Okna RiverMartin Manina0Peter Halaj1Luboš Jurík 2Tatiana Kaletová 3Slovak University of Agriculture in NitraSlovak University of Agriculture in NitraSlovak University of Agriculture in NitraSlovak University of Agriculture in NitraAim of the study: This study presents an opportunity to determine a value of longitudinal dispersion and is focused on the comparison of seasonal variation of the longitudinal dispersion predetermined by natural conditions of the river aquatic zone. Material and methods: The dispersion of a pollutant tracer was simulated by HEC-RAS model and by one dimensional advection-diffusion equation. Determination of longitudinal dispersion coefficient was done on the base of tracer experiments (2 kg NaCl in 10 l H2O) carried out in March, August and October 2019. Both methods were applied to the Okna River localized in the Eastern Slovak Lowland Results and conclusions: Result showed, that model HEC-RAS very sensitive reacted to the changes of dispersion and vegetation in the river. Estimated longitudinal dispersion coefficient for Okna river by equation during the year, was in a range from 0.093 to 1.08 m2s-1 and by the HEC-RAS it was from 0.220 to 1.850 m2s-1. Results could represent different values of longitudinal dispersion simulated by the model or equation. Obtained coefficients have a wide application. A main use of these numbers is with simulation of the spread of accidental pollution in rivers. Also, it can be applied to streams with similar characteristics. Results showed important role of seasonal variation of longitudinal dispersion coefficient that must be assumed in simulation of pollution spreading in rivers.http://acta.urk.edu.pl/MODELLING-SEASONAL-CHANGES-OF-LONGITUDINAL-DISPERSION-AT-THE-OKNA-RIVER,122201,0,2.htmlfield experimenthec-rastracerlongitudinal dispersion |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Martin Manina Peter Halaj Luboš Jurík Tatiana Kaletová |
spellingShingle |
Martin Manina Peter Halaj Luboš Jurík Tatiana Kaletová Modelling seasonal changes of longitudinal dispersion at the Okna River Acta Scientiarum Polonorum. Formatio Circumiectus field experiment hec-ras tracer longitudinal dispersion |
author_facet |
Martin Manina Peter Halaj Luboš Jurík Tatiana Kaletová |
author_sort |
Martin Manina |
title |
Modelling seasonal changes of longitudinal dispersion at the Okna River |
title_short |
Modelling seasonal changes of longitudinal dispersion at the Okna River |
title_full |
Modelling seasonal changes of longitudinal dispersion at the Okna River |
title_fullStr |
Modelling seasonal changes of longitudinal dispersion at the Okna River |
title_full_unstemmed |
Modelling seasonal changes of longitudinal dispersion at the Okna River |
title_sort |
modelling seasonal changes of longitudinal dispersion at the okna river |
publisher |
Publishing House of the University of Agriculture in Krakow |
series |
Acta Scientiarum Polonorum. Formatio Circumiectus |
issn |
1644-0765 |
publishDate |
2020-06-01 |
description |
Aim of the study:
This study presents an opportunity to determine a value of longitudinal dispersion and is focused on the comparison of seasonal variation of the longitudinal dispersion predetermined by natural conditions of the river aquatic zone.
Material and methods:
The dispersion of a pollutant tracer was simulated by HEC-RAS model and by one dimensional advection-diffusion equation. Determination of longitudinal dispersion coefficient was done on the base of tracer experiments (2 kg NaCl in 10 l H2O) carried out in March, August and October 2019. Both methods were applied to the Okna River localized in the Eastern Slovak Lowland
Results and conclusions:
Result showed, that model HEC-RAS very sensitive reacted to the changes of dispersion and vegetation in the river. Estimated longitudinal dispersion coefficient for Okna river by equation during the year, was in a range from 0.093 to 1.08 m2s-1 and by the HEC-RAS it was from 0.220 to 1.850 m2s-1. Results could represent different values of longitudinal dispersion simulated by the model or equation. Obtained coefficients have a wide application. A main use of these numbers is with simulation of the spread of accidental pollution in rivers. Also, it can be applied to streams with similar characteristics. Results showed important role of seasonal variation of longitudinal dispersion coefficient that must be assumed in simulation of pollution spreading in rivers. |
topic |
field experiment hec-ras tracer longitudinal dispersion |
url |
http://acta.urk.edu.pl/MODELLING-SEASONAL-CHANGES-OF-LONGITUDINAL-DISPERSION-AT-THE-OKNA-RIVER,122201,0,2.html |
work_keys_str_mv |
AT martinmanina modellingseasonalchangesoflongitudinaldispersionattheoknariver AT peterhalaj modellingseasonalchangesoflongitudinaldispersionattheoknariver AT lubosjurik modellingseasonalchangesoflongitudinaldispersionattheoknariver AT tatianakaletova modellingseasonalchangesoflongitudinaldispersionattheoknariver |
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1721453217806548992 |