Acta Hydrologica Slovaca, Vol. 21, No. 1, 2020, p. 3 - 8, doi: 10.31577/ahs-2020-0021.01.0001
Scientific Paper, English

Gabriel Földes, Marija Mihaela Labat, Silvia Kohnová: CLM climate scenario and its impact on seasonality changes in short-term rainfall intensities in mountainous regions of Slovakia

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  • The study is focusing on detecting changes in short-term rainfall at 4 selected climatological stations in the mountainous area in the northern part of Slovakia. The aim of the paper was to detect trends and seasonal changes in the future horizons using the outputs of the Community Land Model (CLM) scenario, which is a moderately pessimistic scenario that compares well to current processes in the atmosphere. The scenario was used to compare historical (1960–2000) and simulated future 2070–2100 periods. Finally, the results obtained for the stations from the high mountainous areas, were compared with the results from the southern parts of Slovakia. The results provide an overview of the predicted changes in the seasonality and trends of the short-term rainfall intensities in areas with mountainous climate in Slovakia

    KEY WORDS: short-term rainfall, seasonality, trends, CLM scenario, Slovakia

    Address:
    - Gabriel Földes, Department of Land and Water Resources Management, Faculty of Civil Engineering, Slovak University of Technology, Radlinského 11, 810 05 Bratislava, Slovak Republic (Corresponding author. Tel.: Fax.: Email: gabriel.foldes@stuba.sk)
    - Marija Mihaela Labat, Department of Land and Water Resources Management, Faculty of Civil Engineering, Slovak University of Technology, Radlinského 11, 810 05 Bratislava, Slovak Republic
    - Silvia Kohnová, Department of Land and Water Resources Management, Faculty of Civil Engineering, Slovak University of Technology, Radlinského 11, 810 05 Bratislava, Slovak Republic

     




Acta Hydrologica Slovaca, Vol. 21, No. 1, 2020, p. 9 - 18, doi: 10.31577/ahs-2020-0021.01.0002
Scientific Paper, English

Dana Halmová, Pavla Pekárová: Runoff regime changes in the Slovak Danube River tributaries

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  • This paper deals with a statistical analysis of changes in the hydrological regime of Slovak tributaries of the Danube River at 11 stations over two 30-year periods: 1931–1960 and 1986–2015. We analyzed changes in monthly discharges using the Pardé coefficient method, as well as changes in average daily discharges. The monthly Pardé coefficients may be used to plot so-called regime curves. Their course is essentially determined by the monthly water balances in the catchments, as well as by intra-annual storage effects like snow accumulation and snowmelt. Changes in the course of Pardé coefficients for water stations of Slovak tributaries of the Danube River do not show any major changes, except for the Ipeľ-Holiša and Topľa-Hanušovce stations. From the results of the daily flow rate analysis it is clear that the course of daily flow rates in the monitored stations remains unchanged during the year and in the most of the monitored Slovak stations the daily flow rates decrease, except for the water stations Belá-Podbanské and Váh-Liptovský Mikuláš.

    KEY WORDS: intra-annual flow regime, PARDÉ coefficient, daily and monthly discharge, Slovak Danube tributaries

    Address:
    - Dana Halmová, Institute of Hydrology SAS, Dúbravská cesta č. 9, 841 04 Bratislava, Slovak Republic (Corresponding author. Tel.: Fax.: Email: halmova@uh.savba.sk))
    - Pavla Pekárová, Institute of Hydrology SAS, Dúbravská cesta č. 9, 841 04 Bratislava, Slovak Republic

     




Acta Hydrologica Slovaca, Vol. 21, No. 1, 2020, p. 19 - 28, doi: 10.31577/ahs-2020-0021.01.0003
Scientific Paper, English

Jakub Mészáros, Pavla Pekárová, Ján Pekár: Estimation of discharge with long return period using historical flood records

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  • Records of historical catastrophic floods provide extremely valuable knowledge about the frequency of occurrence of such events on the rivers that do not have a series of discharge observations long enough, or observations are completely absent. In this paper we present knowledge about historical floods on the Teplica River in Sobotište and its catchment. Based on statistical processing of the series of maximum annual discharge from the water gauge Sobotište-Teplica, we present the impact of the inclusion of historical floods on the estimation of the T-year design discharge values.

    KEY WORDS: historical floods, T-year values, LP3 distribution, Teplica River

    Address:
    - Jakub Mészáros, Institute of Hydrology SAS, Dúbravská cesta č. 9, 841 04 Bratislava, Slovak Republic (Corresponding author. Tel.: Fax.: Email: hydrjaku@uh.savba.sk)
    - Pavla Pekárová, Institute of Hydrology SAS, Dúbravská cesta č. 9, 841 04 Bratislava, Slovak Republic
    - Ján Pekár, Comenius University in Bratislava, Faculty of Mathematics, Physics, and Informatics, Department of Applied Mathematics and Statistics, Mlynská dolina, 842 48 Bratislava, Slovak Republic

     




Acta Hydrologica Slovaca, Vol. 21, No. 1, 2020, p. 29 - 38, doi: 10.31577/ahs-2020-0021.01.0004
Scientific Paper, English

Veronika Bačová Mitková: Bivariate joint probability analysis of flood hazard at river confluence

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  • Assessing the statistical significance of floods in the complex hydrological conditions that exist at the confluence of the main river and its tributaries, as well as the choice of hydrological design parameters for flood protection in these areas is one of the main tasks in the current hydrology. The main aim of this paper is a joint bivariate frequency analysis of annual peak discharges and synchronously occurred maximum discharges at the main river and its tributary. The annual maximum and daily maximum discharges of the Morava River, as main river, and its tributary Myjava River were analysed. We selected the most appropriate copula function for our bivariate analysis. Selected copulas were used to illustrate the joint occurrence probabilities and joint return periods of the discharge pairs and consequently to determine the joint probabilities of measured discharges. Results of such analyses provide comprehensive information about flood situations where a devastating effect may be increased in the case were floods occur at the same time on the main river and its tributary. And at the same time, the results obtained by the bivariate analysis of the variables which characterize the hydrological regime can contribute to a more reliable assessment of the flood risks.

    KEY WORDS: maximal mean daily discharge, annual peak discharges, corresponding discharge, joint probability distribution, copula function.

    Address:
    - Veronika Bačová Mitková, Institute of Hydrology SAS, Dúbravská cesta č. 9, 841 04 Bratislava, Slovak Republic (Corresponding author. Tel.: Fax.: Email: mitkova@uh.savba.sk)

     




Acta Hydrologica Slovaca, Vol. 21, No. 1, 2020, p. 39 - 47, doi: 10.31577/ahs-2020-0021.01.0005
Scientific Paper, English

Mária Ďurigová, Kamila Hlavčová: The detection of changes in the upper Váh river basin according to a decadal analysis

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  • In changing climate conditions, hydrometeorological data analysis is an option for determining identifiers for changes in runoff. Various methods are used for the analysis of hydrometeorological elements, e.g., statistical tests or various hydrological analysis. The aim of the article is to analyse hydrological time data series by comparing their averages over decades. The time data series used were mean monthly, seasonal, and annual discharges; the average total monthly rainfall in a river basin, and the average air temperatures in the river basin. The decadal analysis was applied at 16 stage-discharge gauging stations that are located in the upper section of the Váh river basin in Slovakia. The total monthly rainfall and air temperatures were calculated as the average values for the various catchments. The results show the lowest discharge occurred in the 1980s and the highest in the 2000s. Comparing the winter and summer season discharges, stations located in the eastern part of the area have a higher summer season discharges, while other stations have higher discharges in the winter season. The results of the air temperature analysis indicate an apparent upward trend in all the stations. Between the warmest and the coldest decades, the average difference in each river basin is 1.5°C. The precipitation regime in the earlier decades had a variable or decreasing character. Since the 1980s, there has been a slight increase. The increase in air temperature appears to affect the decreasing flow rate due to increasing evapotranspiration. The increase in precipitation in recent decades has been reflected in some stations by an increase in discharges.

    KEY WORDS: analysis of decades, Váh river basin, climate change

    Address:
    - Mária Ďurigová, Department of Land and Water Resources Management, Faculty of Civil Engineering, Slovak University of Technology in Bratislava, Radlinského 11, 810 05 Bratislava, Slovak Republic (Corresponding author. Tel.: Fax.: Email: maria.durigova@stuba.sk)
    - Kamila Hlavčová, Department of Land and Water Resources Management, Faculty of Civil Engineering, Slovak University of Technology in Bratislava, Radlinského 11, 810 05 Bratislava, Slovak Republic

     




Acta Hydrologica Slovaca, Vol. 21, No. 1, 2020, p. 48 - 55, doi: 10.31577/ahs-2020-0021.01.0006
Scientific Paper, English

Pavla Pekárová, Pavol Miklánek, Ján Pekár, Zuzana Danáčová: Long-term development of discharge and nitrate concentrations in the Little Carpathians headwaters

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  • One of the requirements imposed by the Water Framework Directive 2000/60/EC (WFD, 2000) is to analyze and predict long-term evolution of surface water quality parameters. During 28-years period (1991–2018), the concentrations of selected pollutants were monitored in the Little Carpathians headwater basins by the Institute of Hydrology, SAS. In this study we analyse the long-term development of runoff and nitrates nitrogen concentrations in the Parná River at Horné Orešany water gauge station during the period 1991–2018. Discharges in the Parná River decreased slightly, but the trend is not statistically significant. In the case of nitrate nitrogen concentrations the marked decrease occurred in this river basin from the value of 5.11 mg l-1 during the years 1991–1995 to the value of 2.49 mg l-1 in the years 2015–2018. The relation between discharge and nitrate concentration was used to derive exponential empirical relations for estimation of the nitrate nitrogen concentrations in the stream based on mean daily discharge during the sampling day. These equations can be used for indirect estimation of nitrate nitrogen concentrations when they were not measured directly

    KEY WORDS: runoff, discharge variability, nitrate, long term trends

    Address:
    - Pavla Pekárová, Institute of Hydrology SAS, Dúbravská cesta č. 9, 841 04 Bratislava, Slovak Republic (Corresponding author. Tel.: Fax.: Email: pekarova@uh.savba.sk))
    - Pavol Miklánek, Institute of Hydrology SAS, Dúbravská cesta č. 9, 841 04 Bratislava, Slovak Republic
    - Ján Pekár, Comenius University in Bratislava, Faculty of Mathematics, Physics, and Informatics, Department of Applied Mathematics and Statistics, Mlynská dolina, 842 48 Bratislava, Slovak Republic
    - Zuzana Danáčová, Slovak Hydrometeorological Institute, Jeséniova 17, 833 15 Bratislava, Slovak Republic

     




Acta Hydrologica Slovaca, Vol. 21, No. 1, 2020, p. 56 - 64, doi: 10.31577/ahs-2020-0021.01.0007
Scientific Paper, English

Cyril Siman, Yvetta Velísková: Impact of different proportion of agricultural land in river catchments on nitrogen surface streams pollution

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  • Water quality is threatened particularly in regions where the agricultural landscape is prevailing. This study presents results of the comparison of yearly total nitrogen emissions and contribution of different emission pathways on this emissions into surface streams for three river catchments in Slovakia territory with the contrasting proportion of agricultural land to the total area of the river catchment. For nitrogen yearly emissions and pathways detection, the numerical model MONERIS has been used. Results indicate that in river catchments with a higher proportion of agricultural land higher contribution of nitrogen emission carried out mainly via groundwater (especially in lowland), but also via agricultural erosion and drainage system.

    KEY WORDS: water quality, surface stream, nitrogen emission, MONERIS, river catchment

    Address:
    - Cyril Siman, Institute of Hydrology SAS, Dúbravská cesta č. 9, 841 04 Bratislava, Slovak Republic (Corresponding author. Tel.: Fax.: Email: siman@uh.savba.sk)
    - Yvetta Velísková, Institute of Hydrology SAS, Dúbravská cesta č. 9, 841 04 Bratislava, Slovak Republic

     




Acta Hydrologica Slovaca, Vol. 21, No. 1, 2020, p. 65 - 73, doi: 10.31577/ahs-2020-0021.01.0008
Scientific Paper, English

Viera Kováčová: Assessment of surface water eutrophication at Žitný ostrov region

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  • The purpose of this report is to review the role of nitrogen (N) and phosphorus (P) in the eutrophication of surface water. The work was required by Water Framework Directive 2000/60/ES as part of investigating excessive nutrient enrichment. This report reviews nutrient inputs to surface water; the role of nutrients in the eutrophication of surface water; the response of biota to nutrient enrichment; monitoring of changes due to eutrophication and the management of eutrophication. Monitoring of surface water bodies has been provided in terms of requirements of the Water Framework Directive. With regards of international and national legislative for the ecological status assessment ecological potential, chemical status, biological quality elements, supporting physical-chemical and hydro-morphological quality elements as well as the specific substances have been investigated. The aim of this contribution was to analyse eutrophication problem, factors affecting this process, its consequences and possibilities of prevention. The partial aim was to evaluate eutrophication state of surface water in Žitný ostrov channel network following the assessment physical-chemical and microbiological indicators in monitored period.

    KEY WORDS: surface water, eutrophication, nutrients, nitrogen, phosphorus

    Address:
    - Viera Kováčová, Institute of Hydrology SAS, Dúbravská cesta č. 9, 841 04 Bratislava, Slovak Republic (Corresponding author. Tel.: Fax.: Email: kovacova@uh.savba.sk)

     




Acta Hydrologica Slovaca, Vol. 21, No. 1, 2020, p. 74 - 81, doi: 10.31577/ahs-2020-0021.01.0009
Scientific Paper, English

Lucia Balejčíková, Andrej Tall, Branislav Kandra, Dana Pavelková: Relationship of nitrates and nitrites in the water environment with humans and their activity

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  • Nitrates and nitrites in water pose a health and environmental hazards, in particular when exceeding limits defined in the European Union, i.e. max. 50 mg l-1 of nitrates. It is not recommended to exceed the limit of 10 mg l-1 of nitrates for infants and children. The maximum concentration of nitrites is 0.5 mg l-1 for adults and infants less than 0.1 mg l-1. Our work offers a review of the water quality concerning the relationship between nitrates/nitrites and humans. Basic properties and forms of nitrates, their use for human activities, importance and risks to human health and possibilities of their physicochemical determination are summarized. Our study demonstrates also the novel approaches to the nitrates decontamination in a water environment using various nanomaterials. We aimed at a collection of records from the monitoring of nitrates in selected areas in Slovakia to show good quality of water in various water sources, which over time improves due to the increasingly low fertilization intensity and thus of agriculture production, which is gradually being replaced by imports.

    KEY WORDS: nitrates/nitrites, importance/risk, determination, decontamination, monitoring

    Address:
    - Lucia Balejčíková, Institute of Hydrology SAS, Dúbravská cesta č. 9, 841 04 Bratislava, Slovak Republic (Corresponding author. Tel.: Fax.: Email: balejcikova@uh.savba.sk)
    - Andrej Tall, Institute of Hydrology SAS, Dúbravská cesta č. 9, 841 04 Bratislava, Slovak Republic
    - Branislav Kandra, Institute of Hydrology SAS, Dúbravská cesta č. 9, 841 04 Bratislava, Slovak Republic
    - Dana Pavelková, Institute of Hydrology SAS, Dúbravská cesta č. 9, 841 04 Bratislava, Slovak Republic

     




Acta Hydrologica Slovaca, Vol. 21, No. 1, 2020, p. 82 - 88, doi: 10.31577/ahs-2020-0021.01.0010
Scientific Paper, English

Štefan Rehák, Peter Stradiot, Karol Kňava, Ľubica Kopčová, Viliam Novák: Method of wetlands water regimen diagnosis

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  • Wetlands are territories, permanently or temporary waterlogged; temporary waterlogging must cover majority of the season. Wetlands are ecosystems typical by maximum (potential) evapotranspiration with high solar energy consump-tion; therefore, they are important as local climate stabilizers. In this paper, method of wetland water regimen diagnosis is described, applicable to wetlands with so called autonomous water regimen. It means, that wetland water regimen is formed mostly by precipitation and (potential) evapotranspiration; such wetlands are hydrodynamically isolated from its neighbourhood. This is typical for majority of wetlands in Slovakia. Method of diagnosis is based on evaluation of water fluxes to and out of the wetland and is illustrated on three typical wetlands.

    KEY WORDS: waterlogging, precipitation, potential evapotranspiration, wetland management

    Address:
    - Štefan Rehák, Institute of Water Resources Research, Nábrežie arm. gen. L. Svobodu 5, 812 49 Bratislava 1, Slovak Republic (Corresponding author. Tel.: Fax.: Email: rehak@vuvh.sk)
    - Peter Stradiot, Institute of Water Resources Research, Nábrežie arm. gen. L. Svobodu 5, 812 49 Bratislava 1, Slovak Republic
    - Karol Kňava, Institute of Water Resources Research, Nábrežie arm. gen. L. Svobodu 5, 812 49 Bratislava 1, Slovak Republic
    - Ľubica Kopčová, Institute of Water Resources Research, Nábrežie arm. gen. L. Svobodu 5, 812 49 Bratislava 1, Slovak Republic
    - Viliam Novák, Institute of Hydrology SAS, Dúbravská cesta č. 9, 841 04 Bratislava, Slovak Republic

     




Acta Hydrologica Slovaca, Vol. 21, No. 1, 2020, p. 89 - 97, doi: 10.31577/ahs-2020-0021.01.0011
Scientific Paper, English

Zuzana Műnsterová, Jana Pařílková, Jan Mikulka, Jan Dušek: Reconstruction of electric impedance field of soil with clay anomaly

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  • Electrical impedance characterizes the properties of the examined environment when passing through an alternating electric current. The paper is based on the dependence of the course of real and imaginary components of electrical impedance on the humidity of the porous environment. Different soil environments have various water retention capacities under the same hydrometeorological conditions. This hydrophysical characteristic is used in the presented paper to study the inhomogeneity of the porous environment. The contribution is beneficial in that it proposes a method which, based on simple measurements, allows to evaluate the homogeneity of the porous environment. The method is widely used in water management (e.g. determination of failures of sealing cores in earth dams and dams) but also in hydrological survey and monitoring (e.g. determination of volume humidity).

    KEY WORDS: clay, soil, probe, electrical impedance, Z-meter device

    Address:
    - Zuzana Műnsterová, Brno University of Technology, Faculty of Civil Engineering, Institute of Water Structures, Veveří 95, 602 00 Brno, Czech Republic (Corresponding author. Tel.: Fax.: Email: munsterova.z@fce.vutbr.cz)
    - Jana Pařílková, Brno University of Technology, Faculty of Civil Engineering, Institute of Water Structures, Veveří 95, 602 00 Brno, Czech Republic
    - Jan Mikulka, Brno University of Technology, Faculty of Electrical Engineering and Communication, Department of Theoretical and Experimental Electrical Engineering, Technická 3082/12, 616 00 Brno, Czech Republic
    - Jan Dušek, Brno University of Technology, Faculty of Electrical Engineering and Communication, Department of Theoretical and Experimental Electrical Engineering, Technická 3082/12, 616 00 Brno, Czech Republic

     




Acta Hydrologica Slovaca, Vol. 21, No. 1, 2020, p. 98 - 105, doi: 10.31577/ahs-2020-0021.01.0012
Scientific Paper, English

Renáta Dulovičová, Radoslav Schügerl, Yvetta Velísková: Actual values of saturated hydraulic conductivity of channel bed silt and its distribution along Komárňanský channel

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  • This contribution deals with the evaluation of channel bed silt permeability along the Komárňanský channel based on the measurements during the year 2019. Komárňanský channel is the largest one from three great channels of channel network at Žitný ostrov area. The channel bed silt permeability is expressed by parameter of its saturated hydraulic conductivity. This paper describes the current state of channel bed silt distribution along this channel during the year 2019 and simultaneously brings the values of saturated hydraulic conductivity of channel bed silt. The channel bed silts were extracted and obtained by two ways, as a disturbed samples and as an undisturbed samples. The samples were taken in each selected profiles of channel in three layers – top, middle and bottom layer of channel bed silt. The selection of sampling was made in dependency on channel bed silt thickness in the measured profile. The values of channel bed silt saturated hydraulic conductivity from disturbed samples Kd were calculated according to empirical formulas of Bayer-Schweiger and Špaček. The valid values Kd reached from 1.09 x 10-08 – 1.98 x 10-04 m s-1. The values of channel bed silt saturated hydraulic conductivity from undisturbed samples Ku were determined by the laboratory falling head method. The acquired values Ku for Komárňanský channel reached from 3.73 x 10-08 – 2.01 x 10-05 m s-1. The current state of longitudinal distribution of channel bed silt along this channel was demonstrated in the paper graphically and values of saturated hydraulic conductivity were demonstrated numericall

    KEY WORDS: Žitný ostrov channel network, channel bed silt, grain size analysis, silt permeability, saturated hydraulic conductivity

    Address:
    - Renáta Dulovičová, Institute of Hydrology SAS, Dúbravská cesta č. 9, 841 04 Bratislava, Slovak Republic (Corresponding author. Tel.: Fax.: Email: dulovicova@uh.savba.sk)
    - Radoslav Schügerl, Institute of Hydrology SAS, Dúbravská cesta č. 9, 841 04 Bratislava, Slovak Republic
    - Yvetta Velísková, Institute of Hydrology SAS, Dúbravská cesta č. 9, 841 04 Bratislava, Slovak Republic

     




Acta Hydrologica Slovaca, Vol. 21, No. 1, 2020, p. 106 - 112, doi: 10.31577/ahs-2020-0021.01.0013
Scientific Paper, English

Anton Zvala, Tomáš Orfánus, Anežka Čelková: The measurements of saturated hydraulic conductivity of the forest floor under deciduous forest

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  • The aim of the paper is to present and evaluate the measured values of saturated hydraulic conductivity of organic soil horizons under deciduous forest at the examined locality Zelezna studienka. For determination of saturated hydraulic conductivity the single ring method, the falling head method and Guelph infiltrometer were used. The organic matters of forest floor come from dead plant material at various degrees of decomposition and aggregation and significantly influence the initiation processes of infiltration and outflow. The organic soil horizons of forest floor have extremely high porosity, very low bulk density, peculiar texture and structure, are changed according to the degree of mechanical and biochemical decomposition. The average values of saturated hydraulic conductivity were measured in the range from 153.39 cm h-1 for the falling head method up to 392.1 cm h-1 for the single ring method

    KEY WORDS: infiltration measurements, saturated hydraulic conductivity, forest floor, organic soil horizons

    Address:
    - Anton Zvala, Institute of Hydrology SAS, Dúbravská cesta č. 9, 841 04 Bratislava, Slovak Republic (Corresponding author. Tel.: Fax.: Email: zvala@uh.savba.sk)
    - Tomáš Orfánus, Institute of Hydrology SAS, Dúbravská cesta č. 9, 841 04 Bratislava, Slovak Republic
    - Anežka Čelková, Institute of Hydrology SAS, Dúbravská cesta č. 9, 841 04 Bratislava, Slovak Republic

     




Acta Hydrologica Slovaca, Vol. 21, No. 1, 2020, p. 113 - 122, doi: 10.31577/ahs-2020-0021.01.0014
Scientific Paper, English

Dana Baroková, Michaela Červeňanská, Andrej Šoltész: Assessment of the impact of proposed cut-off walls on ground-water level regime during extreme hydrological conditions

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  • The capacity of rivers Váh, Small Danube and the deviation of river Nitra, located in Slovakia, is sufficient in terms of transferring flood flow rates, however defects occur during long-lasting flood situations. If the problem is ignored, different processes may eventually endanger the adjacent territory or may lead to contamination of water and soil as a result of flooding a nearby sewage treatment plant. For these reasons an additional sealing of dykes was proposed. The article deals with the impacts of suspended cut-off walls on groundwater flow and level regime in a wider area for both steady and unsteady scenarios.

    KEY WORDS: cut-off wall, numerical simulation, groundwater, flood, TRIWACO

    Address:
    - Dana Baroková, Department of Hydraulic Engineering, Faculty of Civil Engineering, Slovak University of Technology in Bratislava, Radlinského 11, 810 05 Bratislava, Slovak Republic (Corresponding author. Tel.: Fax.: Email: dana.barokova@stuba.sk)
    - Michaela Červeňanská, Department of Hydraulic Engineering, Faculty of Civil Engineering, Slovak University of Technology in Bratislava, Radlinského 11, 810 05 Bratislava, Slovak Republic
    - Andrej Šoltész, Department of Hydraulic Engineering, Faculty of Civil Engineering, Slovak University of Technology in Bratislava, Radlinského 11, 810 05 Bratislava, Slovak Republic

     




Acta Hydrologica Slovaca, Vol. 21, No. 1, 2020, p. 123 - 129, doi: 10.31577/ahs-2020-0021.01.0015
Scientific Paper, English

Radoslav Schügerl, Yvetta Velísková, Valentín Sočuvka, Renáta Dulovičová: Effect of aquatic vegetation on Manning´s roughness coefficient value – Case study at the Šúrsky channel

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  • Vegetation growing in the water along watercourses has been the subject of several studies since it was recognized that it could have a significant impact on the water flowIncreased bed roughness caused by aquatic vegetation is a very often phenomenon in case of flow in natural open channel during the growing season. Vegetation impedes the water flow and may increase flood risks. Thus, determining the effect of aquatic vegetation on flow conditions in streams is very important for estimation of hydrodynamics in natural streams. Occurance of aquatic vegetation is more often in case of lowland streams. The purpose of this paper is to investigate and determine how aquatic vegetation influences flow resistance, water depth and discharge in the Šúrsky channel at the Podunajská lowland area. Measurements performed during three various times of year 2019 at this stream were used for an evaluation of vegetation impact on flow conditions in this stream. The Manning´s coefficient was used as one way of quantifying this impact. The results show variation of this parameter during the winter and summer season.

    KEY WORDS: aquatic vegetation, water-level, discharge, Manning´s roughness coefficient

    Address:
    - Radoslav Schügerl, Institute of Hydrology SAS, Dúbravská cesta č. 9, 841 04 Bratislava, Slovak Republic (Corresponding author. Tel.: Fax.: Email: schugerl@uh.savba.sk)
    - Yvetta Velísková, Institute of Hydrology SAS, Dúbravská cesta č. 9, 841 04 Bratislava, Slovak Republic
    - Valentín Sočuvka, Institute of Hydrology SAS, Dúbravská cesta č. 9, 841 04 Bratislava, Slovak Republic
    - Renáta Dulovičová, Institute of Hydrology SAS, Dúbravská cesta č. 9, 841 04 Bratislava, Slovak Republic

     




AHS Editorial Office
Institute of Hydrology SAS
Dúbravská cesta 9
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Slovak Republic
web: www.ih.sav.sk/ah
email: Yvetta.Veliskova@savba.sk

Journal of Hydrology and Hydromechanics
Institute of Hydrology SAS
Dúbravská cesta 9
841 04 Bratislava
Slovak Republic
web: www.ih.sav.sk/jhh

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