Delimiting sub-areas in water bodies using multivariate data analysis on the example of Lake Balaton (W Hungary)

Kovács, József; Nagy, Mária Orbánné; Czauner, Brigitta; Kovács, Ilona Székely; Borsodi, Andrea K.; Hatvani, István Gábor

doi:10.1016/j.jenvman.2012.06.002

Cited by 20 publications

(13 citation statements)

References 23 publications

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“…In Hungary, even though the standard monitoring network for surface water quality has been operated for rivers and large lakes and satisfies the standards for confidence of Water Framework Directive, it ignores small watercourses and may not be adequate for precise and accurate characterization Assessing the flow alteration of temporary streams 7 for water quality (László et al 2007). Single surface waters are generally considered one 'water body' and is not a common practice of delineating them based on water quality parameters aside from some exceptions (Kovács et al 2012). Coastal water bodies in the Basque country were split into different stretches, using the salinity gradient as a characterization factor in order to fit the classification of the various water bodies to their hydrographical properties (Muxika et al 2007).…”

Section: Discussionmentioning

confidence: 99%

Assessing the flow alteration of temporary streams under current conditions and changing climate by Soil and Water Assessment Tool model

Tzoraki

Girolamo

Gamvroudis

et al. 2015

International Journal of River Basin Management

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A new approach, the 'Naturalness Status' (NS), is suggested to classify the hydrologic alteration of temporary rivers from natural conditions based on the Hydrological Status Tool (HS-Tool). The HS-Tool considers two metrics: the degree and the predictability of dry flow conditions for both natural flow and its alterations, at each water body in actual and natural conditions. The Soil and Water Assessment Tool (SWAT) model is simulating the river flow of Evrotas water bodies, Greece, under natural, actual and climate-impacted conditions. The majority of Evrotas water bodies (72%) experience good (low-impacted) NS for the examined period (1990 -2010), despite their intermittent flow regime. Severe flow alteration is predicted for 57% of Evrotas water bodies (high-impacted NS), while selecting the KNMI-RACMO2 future climate projections scenario (2020-2060) as input into the SWAT model. Hydrologic extreme drought phenomena or anthropogenic pressures in water regime can be quantified by the NS. The method is intended to be used in basin decision-making analysis at fulfilling the Water Framework Directive goals.

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Section: Discussionmentioning

confidence: 99%

Assessing the flow alteration of temporary streams under current conditions and changing climate by Soil and Water Assessment Tool model

Tzoraki

Girolamo

Gamvroudis

et al. 2015

International Journal of River Basin Management

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“…Combining only CA and PCA, Fan et al (2010) and Razmkhah et al (2010) sought the spatio-temporal variability between riverine sampling sites. Hatvani et al (2011;2014a) also used CA to group similar sampling sites in the Kis-Balaton Water Protection System (the mitigation wetland of Lake Balaton, Hungary) and the shallow groundwater system of the Seewinkel (Hatvani et al 2014c), while Kovács et al (2012a) used a special coded CA to determine the water quality areas of Lake Balaton.…”

Section: Introductionmentioning

confidence: 99%

Optimization of the monitoring network on the River Tisza (Central Europe, Hungary) using combined cluster and discriminant analysis, taking seasonality into account

Tanos

Kovács

et al. 2015

Environ Monit Assess

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The most essential requirement for water management is efficient and informative monitoring. Operating water quality monitoring networks is a challenge from both the scientific and economic points of view, especially in the case of river sections ranging over hundreds of kilometers. Therefore, spatio-temporal optimization is vital. In the present study, the optimization of the monitoring system of the River Tisza, the second largest river in Central Europe, is presented using a generally applicable and novel method, combined cluster and discriminant analysis (CCDA). This area for the study was chosen because, spatial inhomogeneity of a river's monitoring network can more easily be studied in a mostly natural watershed - as in the case of the River Tisza - since the effects of man-made obstacles: e.g water barrage systems, hydroelectric power plants, artificial lakes, etc. are more pronounced. Furthermore, since the temporal sampling frequency was bi-weekly, the opportunity of optimizing the monitoring system on a temporal (monthly) scale arose. In the research, 15 water quality parameters measured at 14 sampling sites in the Hungarian section of the River Tisza were assessed for the time period 1975-2005. First, four within-year sections ("hydrochemical seasons") were determined, characterized with unequal lengths, namely 2, 4, 2, and 4 months long starting with spring. Homogeneous groups of sampling sites were determined in space for every season, with the main separating factors being the tributaries and man-made obstacles. Similarly, an overall pattern of homogeneity was determined. As an overall result, the 14 sampling sites could be grouped into 11 homogeneous groups leading to the possibility of reducing the number of sampling locations and thus making the monitoring system more cost-efficient.

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“…This is a widely known multivariate classification method in which each case starts in a separate cluster and joins up to the other clusters as the linkage distance grows, until only one cluster remains [41]. This method has been successfully applied in hydrology [42][43][44][45], hydrogeology [46], geology [47][48][49][50][51], chemistry [52] and anthropology [53] to find similar and homogeneous groups of observations. The validity of the groupings was verified using linear discriminant analysis (LDA), which separates the observations with linear planes resulting in a percentage of correctly classified cases [54,55].…”

Section: Discussionmentioning

confidence: 99%

Effects of the introduction of pre-treated wastewater in a shallow lake reed stand

et al. 2016

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Reed stands may be employed in the amelioration of water quality or even in the treatment of wastewater. In this study, the nutrient concentrations of (i) the above- and below-ground Common Reed (Phragmites australis) biomass, and (ii) surface and interstitial water were analyzed in a natural stand used in wastewater treatment. The reed stand was located in Hungarian part of Lake Fertő/Neusiedler See, by the shore near Fertőrákos Bay. The nitrate, phosphate and dissolved organic nitrogen concentrations of surface water were found to be higher on the inlet side of the reed stand compared to the outlet. The N and P concentrations in the above-ground biomass and P concentrations in the below-ground biomass increased after the introduction of pre-treated wastewater. The inter-annual differences in the characteristics of sediment interstitial water and in the nutrient content of reed tissues were assessed using statistical methods. The samples taken before and after the introduction of the pre-treated wastewater in the parcel formed different clusters. The results of the study provide further evidence that the nutrient retention capacity of natural stands of P. australis may be employed in the treatment of wastewater while protecting and preserving the valuable natural assets of the lake.

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Delimiting sub-areas in water bodies using multivariate data analysis on the example of Lake Balaton (W Hungary)

Cited by 20 publications

References 23 publications

Assessing the flow alteration of temporary streams under current conditions and changing climate by Soil and Water Assessment Tool model

Assessing the flow alteration of temporary streams under current conditions and changing climate by Soil and Water Assessment Tool model

Optimization of the monitoring network on the River Tisza (Central Europe, Hungary) using combined cluster and discriminant analysis, taking seasonality into account

Effects of the introduction of pre-treated wastewater in a shallow lake reed stand

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