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Determination of surface runoff from the modelled area

100%

Kaletova T., Nemetova Z.

Environment, Earth and Ecology

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2017

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tom 1

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nr 1

Knowledge of surface runoff characteristics allows creating better conditions for landscape management, whether rural or urban. We focused on a determination of a volume of surface water runoff and it velocity in this paper. A direct measurement was done on an experimental area with three different slopes in a laboratory. Results of direct measurements were compared with results from a model SMODERP and NRCS method used in GIS environment. The velocity of surface runoff was also calculated by a mathematical equation used in literature. The results of surface runoff volume from GIS were equal in all cases, but not the velocity. The results of SMODERP simulation and direct measurements are similar. The calculated velocity was the highest in case of first slope, and the lowest in other cases. Differences of the velocity varied in a range 1.10 - 11.06 %. The volume of surface runoff varied more, mainly the results of NRCS Curve Number method in GIS (up to 41 %). The results show that the higher slope, the higher runoff velocity and volume is.

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Modelling seasonal changes of longitudinal dispersion at the Okna River

80%

Manina M., Halaj P., Jurik L., Kaletova T.

Acta Scientiarum Polonorum. Formatio Circumiectus

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2020

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tom 19

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nr 1

Aim of study The problem of investigation of pollution transport along watercourses is not new, but since it is so complex there is still space for fine-tuning in order to apply it to individual watercourses. This study presents an opportunity to determine a value of longitudinal dispersion and is focused on comparing 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. Longitudinal dispersion coefficient was determined based on 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 in the Eastern Slovak Lowland. Result and conclusions Result showed that HEC-RAS modelling correlated to changes of dispersion and vegetation in the river. During the year, the longitudinal dispersion coefficient for Okna river estimated by the equation remained in a range from 0.093 to 1.08 m² ·s⁻¹, and when estimated using the HEC-RAS, from 0.220 to 1.850 m² ·s⁻¹. Results could represent different values of longitudinal dispersion simulated by the model or the equation. The obtained coefficients have a broad range of applications. The main use of these is as input data in the simulation of the spread of accidental pollution in rivers. Also, they can be applied to streams with similar characteristics. Results demonstrated an important role of seasonal variation of longitudinal dispersion coefficient that must be taken into account in the simulation of pollution spreading in rivers.

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Soil water content evaluation and modeling in small catchment with agricultural use

71%

Jurik L., Kaletova T., Halaszova K., Bako A., Ochmanova L.

Acta Scientiarum Polonorum. Formatio Circumiectus

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2013

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tom 12

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nr 3

Due to extreme consequences of drought and flood in soil and landscape is necessary to know hydrological balance and soil water content. We used historical data about discharge, weather and crops from years 1974–1994, as well as measurements of soil moisture in the forest and arable soil, in grassland and Salix viminalis L. According to this information, the baseflow (by ABSCAN), surface runoff (SCS method), water retention and soil water content were calculated and evaluated.

Ograniczanie wyników

2 Acta Scientiarum Polonorum. Formatio Circumiectus

1 Environment, Earth and Ecology

3 Kaletova T.

2 Jurik L.

1 Bako A.

1 Halaj P.

1 Halaszova K.

1 Manina M.

1 Nemetova Z.

1 Ochmanova L.

1 2020

1 2017

1 2013

Determination of surface runoff from the modelled area

Modelling seasonal changes of longitudinal dispersion at the Okna River

Soil water content evaluation and modeling in small catchment with agricultural use