Assessing water-quality data: The relationship between the water quality amelioration of Lake Balaton and the construction of its mitigation wetland

Hatvani, István Gábor; Clement, Adrienne; Kovács, József; Kovács, Ilona Székely; Korponai, János

doi:10.1016/j.jglr.2013.12.010

Cited by 40 publications

(35 citation statements)

References 29 publications

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“…This is why its samples remained in one group while those in the parcel separated in both time (before and after) and space (inlet and outlet) after the introduction of the pre-treated wastewater. This situation is similar to the one witnessed in a constructed wetland, the Kis-Balaton Water Protection System [75][76][77].…”

Section: Reedssupporting

confidence: 76%

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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Section: Reedssupporting

confidence: 76%

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

et al. 2016

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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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“…Similarity is useful in many cases, e.g. [29,30]. Nonetheless, if the goal is to find not only similarly behaving sampling sites, but even homogeneous groups of sampling sites, one has to find even the most minute differences.…”

Section: Ccda Methodsmentioning

confidence: 99%

Interpretation of sedimentological processes of coarse-grained deposits applying a novel combined cluster and discriminant analysis

Farics

Kovács

et al. 2017

Open Geosciences

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Abstract:The main aim of this paper is to determine the depositional environments of an Upper-Eocene coarsegrained clastic succession in the Buda Hills, Hungary. First of all, we measured some commonly used parameters of samples (size, amount, roundness and sphericity) in a much more objective overall and faster way than with traditional measurement approaches, using the newly developed Rock Analyst application. For the multivariate data obtained, we applied Combined Cluster and Discriminant Analysis (CCDA) in order to determine homogeneous groups of the sampling locations based on the quantitative composition of the conglomerate as well as the shape parameters (roundness and sphericity). The result is the spatial pattern of these groups, which assists with the interpretation of the depositional processes. According to our concept, those sampling sites which belong to the same homogeneous groups were likely formed under similar geological circumstances and by similar geological processes. In the Buda Hills, we were able to distinguish various sedimentological environments within the area based on the results: fan, intermittent stream or marine.

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Assessing water-quality data: The relationship between the water quality amelioration of Lake Balaton and the construction of its mitigation wetland

Cited by 40 publications

References 29 publications

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

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

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

Interpretation of sedimentological processes of coarse-grained deposits applying a novel combined cluster and discriminant analysis

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