@article{MTMT:30326045, title = {Shallow ground temperature measurements on the highest volcano on Earth, Mt. Ojos del Salado, Arid Andes, Chile}, url = {https://m2.mtmt.hu/api/publication/30326045}, author = {Nagy, Balázs and Ignéczi, Ádám and Kovács, József and Szalai, Zoltán and Mari, László}, doi = {10.1002/ppp.1989}, journal-iso = {PERMAFROST PERIGLAC}, journal = {PERMAFROST AND PERIGLACIAL PROCESSES}, volume = {30}, unique-id = {30326045}, issn = {1045-6740}, keywords = {active layer, aeolian processes, Andes, ground ice, ground temperature, permafrost}, year = {2019}, pages = {3-18}, orcid-numbers = {Ignéczi, Ádám/0000-0003-1529-8383; Kovács, József/0000-0002-6797-2504; Szalai, Zoltán/0000-0001-5267-411X; Mari, László/0000-0002-3382-7800} } @article{MTMT:3300740, title = {Chemical durability of lead-bearing glazes in sulphuric acid solutions — Laboratory experiments performed on Zsolnay architectural ceramics from Budapest (Hungary)}, url = {https://m2.mtmt.hu/api/publication/3300740}, author = {Baricza, Ágnes and Bajnóczi, Bernadett and Kovács, József and May, Zoltán and Szabó, Máté Zoltán and Szabó, Csaba and Tóth, Mária}, doi = {10.1080/15583058.2017.1396381}, journal-iso = {INT J ARCHIT HERIT}, journal = {INTERNATIONAL JOURNAL OF ARCHITECTURAL HERITAGE}, volume = {12}, unique-id = {3300740}, issn = {1558-3058}, keywords = {SURFACES; KINETICS; particulate matter; AQUEOUS-SOLUTIONS; DEPOSITION; DISSOLUTION; Corrosion; principal component analysis; URBAN-ENVIRONMENT; Buildings; SILICATE-GLASSES; Chemical durability; Zsolnay; Architectural ceramic; tile; lead glaze}, year = {2018}, eissn = {1558-3066}, pages = {216-236}, orcid-numbers = {Bajnóczi, Bernadett/0000-0003-0006-7611; Kovács, József/0000-0002-6797-2504; Szabó, Csaba/0000-0002-1580-6344} } @article{MTMT:3168501, title = {Taphonomical and palaeoecological investigation of the Late Cretaceous (Maastrichtian) Tuştea vertebrate assemblage (Romania; Haţeg Basin) - insights into a unique dinosaur nesting locality}, url = {https://m2.mtmt.hu/api/publication/3168501}, author = {Botfalvai, Gábor and Csiki-Sava, Z and Grigorescu, D and Vasile, Ş}, doi = {10.1016/j.palaeo.2016.12.003}, journal-iso = {PALAEOGEOGR PALAEOCL}, journal = {PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY}, volume = {468}, unique-id = {3168501}, issn = {0031-0182}, year = {2017}, eissn = {1872-616X}, pages = {228-262}, orcid-numbers = {Botfalvai, Gábor/0000-0002-5479-9036} } @article{MTMT:3215600, title = {Hydraulic evaluation of the hypogenic karst area in Budapest (Hungary)}, url = {https://m2.mtmt.hu/api/publication/3215600}, author = {Erhardt, Ildikó and Ötvös, V and Erőss, Anita and Czauner, Brigitta and Simon, Szilvia and Mádlné Szőnyi, Judit}, doi = {10.1007/s10040-017-1591-3}, journal-iso = {HYDROGEOL J}, journal = {HYDROGEOLOGY JOURNAL}, volume = {25}, unique-id = {3215600}, issn = {1431-2174}, keywords = {SYSTEM; REGION; Hungary; BASIN; karst; FAULTS; Gravity-driven groundwater flow; THERMAL-KARST; Groundwater hydraulics}, year = {2017}, eissn = {1435-0157}, pages = {1871-1891}, orcid-numbers = {Erőss, Anita/0000-0002-2395-3934; Czauner, Brigitta/0000-0001-6591-8611; Simon, Szilvia/0000-0002-3811-9141; Mádlné Szőnyi, Judit/0000-0002-5628-4386} } @article{MTMT:3302122, title = {Interpretation of sedimentological processes of coarse-grained deposits applying a novel combined cluster and discriminant analysis}, url = {https://m2.mtmt.hu/api/publication/3302122}, author = {Farics, Éva and Farics, D and Kovács, József and Haas, János}, doi = {10.1515/geo-2017-0040}, journal-iso = {OPEN GEOSCI}, journal = {OPEN GEOSCIENCES}, volume = {9}, unique-id = {3302122}, issn = {2391-5447}, year = {2017}, eissn = {2391-5447}, pages = {525-538}, orcid-numbers = {Kovács, József/0000-0002-6797-2504; Haas, János/0000-0003-0929-8889} } @article{MTMT:3194648, title = {The role of annual periodic behavior of water quality parameters in primary production. chlorophyll-a estimation}, url = {https://m2.mtmt.hu/api/publication/3194648}, author = {Kovács, József and Tanos, Péter and Várbíró, Gábor and Anda, Angéla and Molnár, Sándor and Hatvani, István Gábor}, doi = {10.1016/j.ecolind.2017.03.002}, journal-iso = {ECOL INDIC}, journal = {ECOLOGICAL INDICATORS}, volume = {78}, unique-id = {3194648}, issn = {1470-160X}, year = {2017}, eissn = {1872-7034}, pages = {311-321}, orcid-numbers = {Kovács, József/0000-0002-6797-2504; Tanos, Péter/0000-0001-6395-1389; Várbíró, Gábor/0000-0001-5907-3472; Hatvani, István Gábor/0000-0002-9262-7315} } @article{MTMT:3290776, title = {Statistically optimal grouping using combined cluster and discriminant analysis (CCDA) on a geochemical database of thermal karst waters in Budapest}, url = {https://m2.mtmt.hu/api/publication/3290776}, author = {Kovács, József and Erőss, Anita}, doi = {10.1016/j.apgeochem.2017.05.009}, journal-iso = {APPL GEOCHEM}, journal = {APPLIED GEOCHEMISTRY}, volume = {84}, unique-id = {3290776}, issn = {0883-2927}, abstract = {Budapest, the capital of Hungary, is famous for its abundant thermal waters. The monitoring network of the thermal karst waters of Budapest consists of 27 sampling locations, from which data for six geochemical parameters and temperature were available for the period 1960-2010. Based on this data, the optimal grouping for the sampling locations was sought using combined cluster and discriminant analysis. Furthermore, the homogeneity of the obtained groups, as well as temporal changes in the overall monitoring system were investigated. The seven groups found are in accordance with the previously established hydrogeological conditions, i.e. the grouping can be considered as optimal. The results obtained using combined cluster and discriminant analysis on the geochemical and temperature database of Budapest have important practical implications, since the thermal waters are an intensely used resource. Any artificial intervention will influence locations belonging to the same group, and therefore the optimal grouping of sampling locations will help in the planning of further activities, This case study might serve as an example in other settings where multiple measurements at multiple sampling locations from a monitoring network are available. (C) 2017 Elsevier Ltd. All rights reserved.}, keywords = {AREAS; Hungary; QUALITY; GROUNDWATER; Budapest; Temporal differences; Combined cluster and discriminant analysis; Thermal karst Waters; Optimal grouping; Homogeneous groups}, year = {2017}, eissn = {1872-9134}, pages = {76-86}, orcid-numbers = {Kovács, József/0000-0002-6797-2504; Erőss, Anita/0000-0002-2395-3934} } @article{MTMT:3090785, title = {Developments in water quality monitoring and management in large river catchments using the Danube River as an example}, url = {https://m2.mtmt.hu/api/publication/3090785}, author = {Chapman, DV and Bradley, C and Gettel, GM and Hatvani, István Gábor and Hein, T and Kovács, József and Liska, I and Oliver, DM and Tanos, Péter and Trásy, Balázs and Várbíró, Gábor}, doi = {10.1016/j.envsci.2016.06.015}, journal-iso = {ENVIRON SCI POLICY}, journal = {ENVIRONMENTAL SCIENCE & POLICY}, volume = {64}, unique-id = {3090785}, issn = {1462-9011}, year = {2016}, eissn = {1873-6416}, pages = {141-154}, orcid-numbers = {Hatvani, István Gábor/0000-0002-9262-7315; Kovács, József/0000-0002-6797-2504; Tanos, Péter/0000-0001-6395-1389; Várbíró, Gábor/0000-0001-5907-3472} } @article{MTMT:2971764, title = {Characterisation of the large-scale production process of oyster mushroom (Pleurotus ostreatus) with the analysis of succession and spatial heterogeneity of lignocellulolytic enzyme activities}, url = {https://m2.mtmt.hu/api/publication/2971764}, author = {Bánfi, Renáta and Pohner, Zsuzsanna and Kovács, József and Luzics, Szabina and Nagy, A and Dudás, M and Tanos, Péter and Márialigeti, Károly and Vajna, Balázs}, doi = {10.1016/j.funbio.2015.10.003}, journal-iso = {FUNGAL BIOL-UK}, journal = {FUNGAL BIOLOGY}, volume = {119}, unique-id = {2971764}, issn = {1878-6146}, year = {2015}, eissn = {1878-6162}, pages = {1354-1363}, orcid-numbers = {Kovács, József/0000-0002-6797-2504; Tanos, Péter/0000-0001-6395-1389; Márialigeti, Károly/0000-0003-1536-5160; Vajna, Balázs/0000-0002-5604-7997} } @article{MTMT:2963171, title = {Heat potential evaluation of effluent and used thermal waters in Budapest, Hungary}, url = {https://m2.mtmt.hu/api/publication/2963171}, author = {Erőss, Anita and Zsemle, Ferenc and Pulay, Eszter}, doi = {10.1556/24.58.2015.1-2.4}, journal-iso = {CENT EUR GEOL}, journal = {CENTRAL EUROPEAN GEOLOGY}, volume = {58}, unique-id = {2963171}, issn = {1788-2281}, year = {2015}, eissn = {1789-3348}, pages = {62-71}, orcid-numbers = {Erőss, Anita/0000-0002-2395-3934; Zsemle, Ferenc/0000-0002-1662-4200} } @article{MTMT:2813140, title = {The chemical characterization of the thermal waters in Budapest, Hungary by using multivariate exploratory techniques}, url = {https://m2.mtmt.hu/api/publication/2813140}, author = {Déri-Takács, Judit and Erőss, Anita and Kovács, József}, doi = {10.1007/s12665-014-3904-3}, journal-iso = {ENVIRON EARTH SCI}, journal = {ENVIRONMENTAL EARTH SCIENCES}, volume = {74}, unique-id = {2813140}, issn = {1866-6280}, keywords = {chemical composition; chemical analysis; Budapest; water quality; Multivariant analysis; Chemical compositions; Thermal waters; hydrochemistry; Multivariate exploratory techniques; Hypogenic karst}, year = {2015}, eissn = {1866-6299}, pages = {7475-7486}, orcid-numbers = {Erőss, Anita/0000-0002-2395-3934; Kovács, József/0000-0002-6797-2504} } @article{MTMT:2949396, title = {Potential maps for the hydrogeologic prerequisites of the installation of deep geothermal doublets and groundwater source heat pump systems in Budapest, Hungary}, url = {https://m2.mtmt.hu/api/publication/2949396}, author = {Mádlné Szőnyi, Judit and Virág, Magdolna and Zsemle, Ferenc}, doi = {10.1556/24.58.2015.1-2.8}, journal-iso = {CENT EUR GEOL}, journal = {CENTRAL EUROPEAN GEOLOGY}, volume = {58}, unique-id = {2949396}, issn = {1788-2281}, year = {2015}, eissn = {1789-3348}, pages = {114-128}, orcid-numbers = {Mádlné Szőnyi, Judit/0000-0002-5628-4386; Virág, Magdolna/0000-0001-6104-1963; Zsemle, Ferenc/0000-0002-1662-4200} } @article{MTMT:2938558, title = {Spatial Optimization of Monitoring Networks on the Examples of a River, a Lake-Wetland System and a Sub-Surface Water System}, url = {https://m2.mtmt.hu/api/publication/2938558}, author = {Kovács, József and Kovács, Solt and Hatvani, István Gábor and Magyar, Norbert and Tanos, Péter and Korponai, János and Blaschke, AP}, doi = {10.1007/s11269-015-1117-5}, journal-iso = {WATER RESOUR MANAG}, journal = {WATER RESOURCES MANAGEMENT}, volume = {29}, unique-id = {2938558}, issn = {0920-4741}, abstract = {Monitoring systems in general have to meet numerous requirements, the most important of which are representativeness and cost efficiency. The aim of the study, therefore, was to present the spatial optimization of the monitoring networks of a river (the Danube), a wetland-lake system (Kis-Balaton & Lake Balaton), and a sub-surface water system in the watershed of Lake Neusiedl/Fertő over a period of approximately two decades using a novel method, Combined cluster and discriminant analysis (CCDA). In the case of the river the results show that the monitoring network yields redundant information on certain sections, so that of 12 sampling sites 3 can be discarded. It was not, however, enough to consider just the tributaries when it comes to optimization. In the case of the wetland (Kis-Balaton) one pair of sampling sites out of 12, while in the case of Lake Balaton 5 out of 10 can be abandoned. For the sub-surface water system, however, all the 50 sites contained exclusive information; hence, all of these were shown to be necessary. In addition, neighboring sampling sites were compared pairwise using CCDA and the corresponding results were visualized in diagrams or so called “difference maps” indicating the location of the biggest differences. This approach also indicates the researcher where to place new sampling sites should the possibility arise. The discussed methodology proved to be highly useful in the optimization of the monitoring networks of the presented water systems.}, year = {2015}, eissn = {1573-1650}, pages = {5275-5294}, orcid-numbers = {Kovács, József/0000-0002-6797-2504; Hatvani, István Gábor/0000-0002-9262-7315; Tanos, Péter/0000-0001-6395-1389; Korponai, János/0000-0003-0211-192X} } @article{MTMT:2791757, title = {Detection and evaluation of changes induced by the diversion of River Danube in the territorial appearance of latent effects governing shallow-groundwater fluctuations}, url = {https://m2.mtmt.hu/api/publication/2791757}, author = {Kovács, József and Márkus, László and Szalai, József and Kovácsné Székely, Ilona}, doi = {10.1016/j.jhydrol.2014.11.052}, journal-iso = {J HYDROL}, journal = {JOURNAL OF HYDROLOGY}, volume = {520}, unique-id = {2791757}, issn = {0022-1694}, keywords = {NUMBER; Cluster Analysis; TIME-SERIES; time series analysis; Dynamic factor analysis; FACTOR MODEL; Shallow-groundwater spatial distribution of background effects; DYNAMIC-FACTOR; AGRICULTURAL AREA ADJACENT; GABCIKOVO/Bos Water Barrage System; EVERGLADES-NATIONAL-PARK}, year = {2015}, eissn = {1879-2707}, pages = {314-325}, orcid-numbers = {Kovács, József/0000-0002-6797-2504; Márkus, László/0000-0002-2883-5048} } @article{MTMT:2969005, title = {Basin-scale conceptual groundwater flow model for an unconfined and confined thick carbonate region}, url = {https://m2.mtmt.hu/api/publication/2969005}, author = {Mádlné Szőnyi, Judit and Tóth, Ádám}, doi = {10.1007/s10040-015-1274-x}, journal-iso = {HYDROGEOL J}, journal = {HYDROGEOLOGY JOURNAL}, volume = {23}, unique-id = {2969005}, issn = {1431-2174}, abstract = {Application of the gravity-driven regional groundwater flow (GDRGF) concept to the hydrogeologically complex thick carbonate system of the Transdanubian Range (TR), Hungary, is justified based on the principle of hydraulic continuity. The GDRGF concept informs about basin hydraulics and groundwater as a geologic agent. It became obvious that the effect of heterogeneity and anisotropy on the flow pattern could be derived from hydraulic reactions of the aquifer system. The topography and heat as driving forces were examined by numerical simulations of flow and heat transport. Evaluation of groups of springs, in terms of related discharge phenomena and regional chloride distribution, reveals the dominance of topography-driven flow when considering flow and related chemical and temperature patterns. Moreover, heat accumulation beneath the confined part of the system also influences these patterns. The presence of cold, lukewarm and thermal springs and related wetlands, creeks, mineral precipitates, and epigenic and hypogenic caves validates the existence of GDRGF in the system. Vice versa, groups of springs reflect rock–water interaction and advective heat transport and inform about basin hydraulics. Based on these findings, a generalized conceptual GDRGF model is proposed for an unconfined and confined carbonate region. An interface was revealed close to the margin of the unconfined and confined carbonates, determined by the GDRGF and freshwater and basinal fluids involved. The application of this model provides a background to interpret manifestations of flowing groundwater in thick carbonates generally, including porosity enlargement and hydrocarbon and heat accumulation. © 2015, Springer-Verlag Berlin Heidelberg.}, keywords = {Hungary; groundwater flow; Hydraulic properties; Carbonate rocks; Geological agency}, year = {2015}, eissn = {1435-0157}, pages = {1359-1380}, orcid-numbers = {Mádlné Szőnyi, Judit/0000-0002-5628-4386; Tóth, Ádám/0000-0002-7300-6687} } @CONFERENCE{MTMT:2891682, title = {Multidimensional Data Analysis of Natural Springs in a Carbonate Region}, url = {https://m2.mtmt.hu/api/publication/2891682}, author = {Kovácsné Bodor, Petra and Tóth, Ádám and Kovács, József and Mádlné Szőnyi, Judit}, booktitle = {1st EAGE/TNO Workshop - Basin Hydrodynamic Systems in Relation to their Contained Resources}, doi = {10.3997/2214-4609.201412324}, unique-id = {2891682}, year = {2015}, orcid-numbers = {Tóth, Ádám/0000-0002-7300-6687; Kovács, József/0000-0002-6797-2504; Mádlné Szőnyi, Judit/0000-0002-5628-4386} } @article{MTMT:2922356, title = {Optimization of the monitoring network on the River Tisza (Central Europe, Hungary) using combined cluster and discriminant analysis, taking seasonality into account}, url = {https://m2.mtmt.hu/api/publication/2922356}, author = {Tanos, Péter and Kovács, József and Kovács, Solt and Anda, Angéla and Hatvani, István Gábor}, doi = {10.1007/s10661-015-4777-y}, journal-iso = {ENVIRON MONIT ASSESS}, journal = {ENVIRONMENTAL MONITORING AND ASSESSMENT}, volume = {187}, unique-id = {2922356}, issn = {0167-6369}, year = {2015}, eissn = {1573-2959}, orcid-numbers = {Tanos, Péter/0000-0001-6395-1389; Kovács, József/0000-0002-6797-2504; Hatvani, István Gábor/0000-0002-9262-7315} } @article{MTMT:2477872, title = {The Water Framework Directive: Can more information be extracted from groundwater data? A case study of Seewinkel, Burgenland, eastern Austria}, url = {https://m2.mtmt.hu/api/publication/2477872}, author = {Hatvani, István Gábor and Magyar, Norbert and Zessner, M and Kovács, József and Blaschke, A P}, doi = {10.1007/s10040-013-1093-x}, journal-iso = {HYDROGEOL J}, journal = {HYDROGEOLOGY JOURNAL}, volume = {22}, unique-id = {2477872}, issn = {1431-2174}, abstract = {Water protection is one of the most important goals in environmental protection. The Clean Water Act in the USA and the Water Framework Directive (WFD) in Europe are the legal frameworks to facilitate the achievement of this goal. The question is raised of whether more information can be extracted from WFD-related groundwater data. To answer it, a methodology has been developed that is easy to use and could be implemented into official practice. A case study is presented in which the groundwater data of a sodic area in Austria (Seewinkel) is assessed. Eighteen parameters in groundwater sampled from 23 wells (1991-2011) were analyzed. With basic statistics, trend-, cluster-, Wilks’ λ and spatial sampling density analysis, local phosphorus and boron phenomena were described, along with the determining role of sulphate, groundwater flow, and the oxygen gradient in the area. As a final step, the spatial sampling density was determined. Regarding the current set of parameters, all the sampling sites are necessary and only in the case of certain parameters (Ca2+, Mg2+, K+, NO3-, pH) could one sampling site be abandoned. The methodology applied brings a new perspective to exploring groundwater data collected according to the requirements of the WFD.}, keywords = {Austria; Groundwater management; multivariate data analysis; Spatial sampling density analysis; European Water Framework Directive (WFD)}, year = {2014}, eissn = {1435-0157}, pages = {779-794}, orcid-numbers = {Hatvani, István Gábor/0000-0002-9262-7315; Kovács, József/0000-0002-6797-2504} } @mastersthesis{MTMT:2538169, title = {Application of state-of-the-art geomathematical methods in water protection Application of state-of-the-art geomathematical methods in water protection - on the example of the data series of the Kis-Balaton Water Protection System}, url = {https://m2.mtmt.hu/api/publication/2538169}, author = {Hatvani, István Gábor}, unique-id = {2538169}, abstract = {Lakes are sensitive to environmental changes and anthropogenic effects, and Lake Balaton, the largest shallow freshwater lake in Central Europe, is no exception. To protect it (and primarily Keszthely Bay) against elevated nutrient loads, the Kis-Balaton Water Protection System (KBWPS) was constructed as a mitigation wetland at the mouth of the River Zala, the largest tributary of the lake. This work aims to demonstrate the applicability of various multivariate state-of-the art geomathematical methods in water protection, and in parallel to explore the long-term time series of the KBWPS to describe its main processes related to water quality. In the course of the research the time series of a total of 24 weekly and 3 daily sampled natural parameters (variables) were used from 14 sampling sites for various time intervals, out of which the longest was 1977-2009. The analyzed dataset comprised approx. 250,000 data. The methods used comprised the following: descriptive statistics, cluster-, discriminant-, principal component-, dynamic factor-, variogram-, wavelet spectrum and autocorrelation analysis. First the descriptive statistics were formed, after which the sampling sites were clustered for each year, showing that the border between the two Phases changes dynamically, and furthermore, when the runoff in the system was low, Keszthely Bay behaved as a separate entity. In the years with high runoff, however, it displayed a similarity rather to the wetland area of the KBWPS. These results were verified in more than 95% of the cases with discriminant analysis. Secondly, PCA showed that, from the perspective of stochastic relations, the parameters of Keszthely Bay which stand in connection to eutrophication decreased in influence after the settling of the KBWPS. Furthermore, the eutrophication processes moved upstream from Keszthely Bay to the hypertrophic area of KBWPS. This study confirms that the effects of the KBWPS - together with other load reduction measures – have had a beneficial effect on the oligotrophication of Lake Balaton. As for the River Zala, the main input of the KBWPS, it was pointed out that the role of the diffuse and point-source nutrient loads governing most of the river’s processes changed in 1991 because of the socio- economic changes and the measures taken to reduce point source nutrient loads. The penultimate step in the process was periodicity and autocorrelation analyses, which in fact pointed out that the incomplete Phase II is unable to conserve the periodicity of the system and sustain a high autocorrelation because of the shading provided by the macrophyte cover, as well as the extra inflows. As a final step the practice of temporal sampling frequency estimation was described in order to suggest a sampling frequency that is suitable for estimating annual nutrient loads and which nevertheless produces a dataset within which environmental processes can be followed. The results pointed towards a three-day sampling frequency for the whole KBWPS in the case of total phosphorus and total nitrogen (if the purpose of the monitoring is nutrient estimation). This reduction in sampling frequency would make an approx. 50% cost reduction possible. The main achievement of this study was that it pointed out changes in the KBWPS over a long time period using various stochastic methods, most of which have individually never before been applied to such a system, much less in an integrated way. It also underlines the importance of the completion of the unfinished constructional Phase II, so its buffer capacity could be enlarged. Hopefully my work will be of assistance to scientists who wish to gain broader perspectives on both the processes evolving in the KBWPS, and also on the further oligotrophication of Keszthely Bay.}, keywords = {Hungary, Lake Balaton; time series analysis; water quality; Stochastic modeling; Kis-Balaton Water Protection System (KBWPS); multivariate data analysis}, year = {2014}, orcid-numbers = {Hatvani, István Gábor/0000-0002-9262-7315} } @article{MTMT:2482550, title = {Assessing water-quality data: the relationship between the water quality amelioration of Lake Balaton and the construction of its mitigation wetland}, url = {https://m2.mtmt.hu/api/publication/2482550}, author = {Hatvani, István Gábor and Clement, Adrienne and Kovács, József and Kovácsné Székely, Ilona and Korponai, János}, doi = {10.1016/j.jglr.2013.12.010}, journal-iso = {J GREAT LAKES RES}, journal = {JOURNAL OF GREAT LAKES RESEARCH}, volume = {40}, unique-id = {2482550}, issn = {0380-1330}, year = {2014}, eissn = {0380-1330}, pages = {115-125}, orcid-numbers = {Hatvani, István Gábor/0000-0002-9262-7315; Clement, Adrienne/0000-0003-1708-8865; Kovács, József/0000-0002-6797-2504; Korponai, János/0000-0003-0211-192X} } @article{MTMT:2491950, title = {Classification into homogeneous groups using combined cluster and discriminant analysis}, url = {https://m2.mtmt.hu/api/publication/2491950}, author = {Kovács, József and Kovács, Solt and Magyar, Norbert and Tanos, Péter and Hatvani, István Gábor and Anda, Angéla}, doi = {10.1016/j.envsoft.2014.01.010}, journal-iso = {ENVIRON MODELL SOFTW}, journal = {ENVIRONMENTAL MODELLING & SOFTWARE}, volume = {57}, unique-id = {2491950}, issn = {1364-8152}, year = {2014}, eissn = {1873-6726}, pages = {52-59}, orcid-numbers = {Kovács, József/0000-0002-6797-2504; Tanos, Péter/0000-0001-6395-1389; Hatvani, István Gábor/0000-0002-9262-7315} } @inproceedings{MTMT:2719983, title = {Környezetváltozás a Száraz-Andokban. Az Ojos del Salado monitoring vizsgálata}, url = {https://m2.mtmt.hu/api/publication/2719983}, author = {Nagy, Balázs and Mari, László and Kovács, József and Nemerkényi, Zsombor and Heiling, Zs}, booktitle = {HUNGEO 2014 Magyar Földtudományi szakemberek XII. találkozója}, doi = {10.13140/2.1.3493.8244}, unique-id = {2719983}, year = {2014}, pages = {53-62}, orcid-numbers = {Mari, László/0000-0002-3382-7800; Kovács, József/0000-0002-6797-2504} } @article{MTMT:2715851, title = {Globotalicypridea mirabilis sp. nov. – the first non-marine ostracod taxon from the Upper Cretaceous of the Haţeg Basin, Romania}, url = {https://m2.mtmt.hu/api/publication/2715851}, author = {Silye, Lóránd and Colin, J-P and Codrea, V}, doi = {10.1016/j.annpal.2014.05.001}, journal-iso = {ANN PALEONTOL}, journal = {ANNALES DE PALEONTOLOGIE}, volume = {100}, unique-id = {2715851}, issn = {0753-3969}, year = {2014}, eissn = {1778-3666}, pages = {273-280}, orcid-numbers = {Silye, Lóránd/0000-0001-7306-6041} } @article{MTMT:2194328, title = {Application of multivariate statistical methods in determining spatial changes in water quality in the Austrian part of Neusiedler See}, url = {https://m2.mtmt.hu/api/publication/2194328}, author = {Magyar, Norbert and Hatvani, István Gábor and Kovácsné Székely, Ilona and Herzig, A and Dinka, Mária and Kovács, József}, doi = {10.1016/j.ecoleng.2013.02.005}, journal-iso = {ECOL ENG}, journal = {ECOLOGICAL ENGINEERING}, volume = {55}, unique-id = {2194328}, issn = {0925-8574}, abstract = {The aim of the present study was to distinguish areas with different chemical properties in Neusiedler See, to determine which background processes are responsible for this pattern, and to discover their spatial distribution. Uni- and multivariate data analysis was applied to the data concerning 13 mainly chemical and some biological parameters for the time period 2000–2009 from 33 sampling sites. The sampling sites were first clustered then grouped. Besides reed belt and open water areas, smaller localities, which are influenced by water inputs (the treatment plant, the river Wulka, the channels of weekend houses) were also distinguished. Using Wilks’ lambda distribution it was determined that the main components (ions) have a greater effect on forming the cluster groups than those parameters which stand in close relation to biological processes. These results concurred with those obtained from the principal component analysis (PCA) conducted on the whole lake and on the groups as well. It can be stated that most of the variance in the dataset can be explained by the main components (ions). The spatial distribution of the principal component scores was visualized with isoline maps. The results of this research lead us to the view that Neusiedler See cannot be treated as one homogeneous system. This exceptional variability originates from the lake's shallow water depth, its unstable water balance, and anthropogenic activity (agriculture, tourism, sewage treatment) in the lake's vicinity.}, keywords = {GROWTH; PLANTS; Chemistry; BIOMASS; constructed wetlands; Cluster Analysis; STANDS; principal component analysis; water quality; SPATIAL VARIABILITY; RIVER-BASIN; Neusiedler See; NUTRIENT-UPTAKE; LAKE FERTO/NEUSIEDLER SEE; REED PHRAGMITES-AUSTRALIS}, year = {2013}, eissn = {1872-6992}, pages = {82-92}, orcid-numbers = {Hatvani, István Gábor/0000-0002-9262-7315; Kovács, József/0000-0002-6797-2504} } @inbook{MTMT:1897650, title = {Hypogenic karst development in a hydrogeological context, Buda Thermal Karst, Budapest, Hungary}, url = {https://m2.mtmt.hu/api/publication/1897650}, author = {Erőss, Anita and Mádlné Szőnyi, Judit and Anita, É CSOMA}, booktitle = {Groundwater Quality Sustainability}, unique-id = {1897650}, year = {2012}, pages = {119-133}, orcid-numbers = {Erőss, Anita/0000-0002-2395-3934; Mádlné Szőnyi, Judit/0000-0002-5628-4386} } @{MTMT:1922453, title = {Analysis of Water Quality Data for Scientists}, url = {https://m2.mtmt.hu/api/publication/1922453}, author = {Kovács, József and Tanos, Péter and Korponai, János and Kovácsné Székely, Ilona and Gondár, K and Gondár-Sőregi, K and Hatvani, István Gábor}, booktitle = {Water Quality Monitoring and Assessment}, doi = {10.5772/32173}, unique-id = {1922453}, year = {2012}, pages = {65-94}, orcid-numbers = {Kovács, József/0000-0002-6797-2504; Tanos, Péter/0000-0001-6395-1389; Korponai, János/0000-0003-0211-192X; Hatvani, István Gábor/0000-0002-9262-7315} } @article{MTMT:1993546, title = {Delimiting sub-areas in water bodies using multivariate data analysis on the example of Lake Balaton (W Hungary)}, url = {https://m2.mtmt.hu/api/publication/1993546}, author = {Kovács, József and Nagy, M and Czauner, Brigitta and Kovácsné Székely, Ilona and Kériné Borsodi, Andrea and Hatvani, István Gábor}, doi = {10.1016/j.jenvman.2012.06.002}, journal-iso = {J ENVIRON MANAGE}, journal = {JOURNAL OF ENVIRONMENTAL MANAGEMENT}, volume = {110}, unique-id = {1993546}, issn = {0301-4797}, abstract = {The main aim of the European Water Framework Directive (WFD, 2000) is to commit European Union Member states to the achievement of good qualitative and quantitative status for all water bodies by 2015. To achieve this, a reference state has to be determined and appropriate monitoring has to be carried out. Based on the fact that the WFD classifies Lake Balaton, the largest shallow freshwater lake in Central Europe, as one water body, and due to the lack of funds, the number of sampling locations on the lake was decreased. The aim of this study was to determine how many sub-areas with different WFDrelated attributes (in this case, parameters) can be delimited in the so-called one water body of Lake Balaton, so that a number of representative sampling locations might be retained. To determine Lake Balaton’s different water quality areas (i.e. sub-areas of water body) 23 parameters (inorganic compounds) were examined from 10 sampling locations for the time interval 1985e2004 using clusterand discriminant analysis, and Wilks’ lambda distribution. With cluster analysis we were able to determine two time intervals (1985e1997 and 1998e2004) with three patterns of sub-areas, two from the first and one from the latter interval. These patterns pointed to the fact that for the whole investigated time interval (1985e2004) a total of five sub-areas were present, changing in number and alignment. Then the results were verified using discriminant analysis, and the parameters which influenced the sub-areas the most were determined using Wilks’ lambda distribution. The conclusion was that to be able to follow the changes in alignment of the sub-areas and to get a comprehensive picture of Lake Balaton, a minimum of five sampling locations should be retained, one in each sub-area. Based on this study the Water Authorities chose to keep five out of ten sampling locations so that the sub-areas could be described. We consider this a great success and the methodology as an example for setting up sub-areas in a water body.}, year = {2012}, eissn = {1095-8630}, pages = {151-158}, orcid-numbers = {Kovács, József/0000-0002-6797-2504; Czauner, Brigitta/0000-0001-6591-8611; Kériné Borsodi, Andrea/0000-0002-3738-7937; Hatvani, István Gábor/0000-0002-9262-7315} } @article{MTMT:1895896, title = {Introducing sampling frequency estimation using variograms in water research with the example of nutrient loads in the Kis-Balaton Water Protection System (W Hungary)}, url = {https://m2.mtmt.hu/api/publication/1895896}, author = {Kovács, József and Korponai, János and Kovácsné Székely, Ilona and Hatvani, István Gábor}, doi = {10.1016/j.ecoleng.2012.02.004}, journal-iso = {ECOL ENG}, journal = {ECOLOGICAL ENGINEERING}, volume = {42}, unique-id = {1895896}, issn = {0925-8574}, abstract = {In most of the world along with urbanization came the deterioration of surface waters. The case of Hungary's Lake Balaton (the largest shallow freshwater lake in Central Europe) and its catchment area was no exception. In the second part of the twentieth century it became clear that measures had to be taken to prevent further water quality deterioration. In order to do so, the Kis-Balaton Water Protection System (KBWPS) was established. To measure its effectiveness in filtering Lake Balaton's water input, total phosphorus and total nitrogen loads are regularly estimated. In this study the practice of temporal sampling frequency estimation is described using data series from the KBWPS in order to suggest a sampling frequency that is suitable for estimating annual nutrient loads and still produces a dataset from which environmental processes can be followed. In this case, temporal sampling frequency estimation was conducted using variogram analysis, before which trend removal was performed on four sampling sites and two daily sampled parameters for the years 1993–2007. Although the calculations were only carried out on two parameters they are applicable to other environmental parameters as well. Nutrient load estimation is used as a verification tool. The result of the variogram analysis pointed towards a three-day sampling frequency for the whole KBWPS in the case of total phosphorus and total nitrogen (if the purpose of the monitoring is nutrient estimation). This reduction in sampling frequency would make an approximately 50% cost reduction possible. The study gives an example of sampling frequency estimation which is a key question in every aspect of environmental science, so that hopefully it will be useful for scientists dealing with water protection issues.}, year = {2012}, eissn = {1872-6992}, pages = {237-243}, orcid-numbers = {Kovács, József/0000-0002-6797-2504; Korponai, János/0000-0003-0211-192X; Hatvani, István Gábor/0000-0002-9262-7315} } @inbook{MTMT:1896004, title = {Adatelemző módszerek alkalmazásának feltételei és lehetőségei a felszíni és felszín alatti víz védelmében}, url = {https://m2.mtmt.hu/api/publication/1896004}, author = {Hatvani, István Gábor and Kovács, József and Barcza, M and Kovácsné Székely, Ilona and Jakusch, P and Bernáth, Gy}, booktitle = {"A fenntartható fejlődés, valamint a környezet- és természetvédelem összefüggései a Kárpát-medencében"}, unique-id = {1896004}, year = {2011}, orcid-numbers = {Hatvani, István Gábor/0000-0002-9262-7315; Kovács, József/0000-0002-6797-2504} } @article{MTMT:1447161, title = {Analysis of long-term water quality changes in the Kis-Balaton Water Protection System with time series-, cluster analysis and Wilks' lambda distribution}, url = {https://m2.mtmt.hu/api/publication/1447161}, author = {Hatvani, István Gábor and Kovács, József and Kovácsné Székely, Ilona and Jakusch, P and Korponai, János}, doi = {10.1016/j.ecoleng.2010.12.028}, journal-iso = {ECOL ENG}, journal = {ECOLOGICAL ENGINEERING}, volume = {37}, unique-id = {1447161}, issn = {0925-8574}, keywords = {Cluster Analysis; time series analysis; Water level management; Wilks' lambda distribution; Mitigation wetland; Kis-Balaton water protection system}, year = {2011}, eissn = {1872-6992}, pages = {629-635}, orcid-numbers = {Hatvani, István Gábor/0000-0002-9262-7315; Kovács, József/0000-0002-6797-2504; Korponai, János/0000-0003-0211-192X} } @article{MTMT:1368044, title = {Morlet wavelet and autocorrelation analysis of long-term data series of the Kis-Balaton water protection system (KBWPS)}, url = {https://m2.mtmt.hu/api/publication/1368044}, author = {Kovács, József and Hatvani, István Gábor and Korponai, János and Kovácsné Székely, Ilona}, doi = {10.1016/j.ecoleng.2010.06.028}, journal-iso = {ECOL ENG}, journal = {ECOLOGICAL ENGINEERING}, volume = {36}, unique-id = {1368044}, issn = {0925-8574}, abstract = {Lake Balaton is the largest shallow freshwater lake in Central Europe. Its water quality is mainly affected by the supplying rivers and other water sources. The primary source is the Zala River. The water of this river used to be filtered by the Kis-Balaton wetland (KBW) before entering Lake Balaton at Keszthely Bay. In the course of the nineteenth century, water level modifications at KBW shrank and it lost its full capacity to function as a filter for the Zala's waters, so the nutrient load of Lake Balaton greatly increased, and its water quality started to deteriorate. This is the reason an artificial extended wetland called the Kis-Balaton water protection system (KBWPS) had to be constructed-to retain the inorganic nutrients at the mouth of the Zala River and stop the further degradation of Balaton's water quality. In this study, Morlet wavelet spectrum (periodicity) analysis and autocorrelation (memory) analysis were used with weekly chemical, biological and physical data for the KBWPS for the period 1993-2007. We compared the periodicity and the memory of the parameters in the two different habitats of the KBWPS and the Zala River. We also analyzed the tracking capability of the periodical seasons of the two phases (the complete Phase I, and the incomplete Phase II) and the river. The results showed that the incomplete Phase II is unable to conserve the periodicity and sustain long memory because of the shading provided by the macrophyte cover and the extra inflows. In conclusion, we were able to point out the dependence of the system's processes on temperature and climate conditions with methods that have not yet been used for this kind of purpose.}, keywords = {EUTROPHICATION; Hungary; QUALITY; Lake Balaton; Kis-Balaton water protection system; wavelet analysis; multivariate data analysis; Autocorrelation analysis; Macrophyte shading; SHALLOW LAKE BALATON}, year = {2010}, eissn = {1872-6992}, pages = {1469-1477}, orcid-numbers = {Kovács, József/0000-0002-6797-2504; Hatvani, István Gábor/0000-0002-9262-7315; Korponai, János/0000-0003-0211-192X} } @article{MTMT:1117954, title = {Analysis of long-term ecological status of Lake Balaton based on the ALMOBAL phytoplankton database}, url = {https://m2.mtmt.hu/api/publication/1117954}, author = {Nagyné Hajnal, Éva and Padisák, Judit}, doi = {10.1007/s10750-007-9207-x}, journal-iso = {HYDROBIOLOGIA}, journal = {HYDROBIOLOGIA}, volume = {599}, unique-id = {1117954}, issn = {0018-8158}, year = {2008}, eissn = {1573-5117}, pages = {227-237}, orcid-numbers = {Nagyné Hajnal, Éva/0000-0002-9498-5052; Padisák, Judit/0000-0001-8285-2896} } @article{MTMT:1076779, title = {Updating water quality targets for shallow Lake Balaton (Hungary), recovering from eutrophication.}, url = {https://m2.mtmt.hu/api/publication/1076779}, author = {Istvánovics, Vera and Clement, Adrienne and Somlyódy, László and Specziár, András and G.-Tóth, László and Padisák, Judit}, doi = {10.1007/s10750-006-0509-1}, journal-iso = {HYDROBIOLOGIA}, journal = {HYDROBIOLOGIA}, volume = {581}, unique-id = {1076779}, issn = {0018-8158}, abstract = {The paper presents an overview about recovery of shallow Lake Balaton from eutrophication by assessing quantitative and qualitative changes in phytoplankton, zooplankton, and chironomids as a function of load reduction. The aim was to update the present water quality targets. The proposed targeting scheme supplements the existing one with a range of lake-specific ecological criteria. We conclude that simple targets (desired phytoplankton biomass and permissible load) are the best choice during the initial stage of eutrophication management, but more complex schemes including ecological criteria are needed to trace recovery when re-organization of the ecosystem takes place.}, year = {2007}, eissn = {1573-5117}, pages = {305-318}, orcid-numbers = {Clement, Adrienne/0000-0003-1708-8865; Padisák, Judit/0000-0001-8285-2896} } @article{MTMT:1014453, title = {Use of phytoplankton assemblages for monitoring ecological status of lakes within the Water Framework Directive: the assemblage index.}, url = {https://m2.mtmt.hu/api/publication/1014453}, author = {Padisák, Judit and Grigorszky, István and Borics, Gábor and Soróczki-Pintér, Éva}, doi = {10.1007/s10750-005-1393-9}, journal-iso = {HYDROBIOLOGIA}, journal = {HYDROBIOLOGIA}, volume = {553}, unique-id = {1014453}, issn = {0018-8158}, year = {2006}, eissn = {1573-5117}, pages = {1-14}, orcid-numbers = {Padisák, Judit/0000-0001-8285-2896; Soróczki-Pintér, Éva/0000-0002-7628-4981} } @article{MTMT:1014071, title = {Cylindrospermopsis raciborskii (Woloszynska) Seenayya et Subba Raju, an expanding, highly adaptive cyanobacterium: worldwide distribution and review of its ecology.}, url = {https://m2.mtmt.hu/api/publication/1014071}, author = {Padisák, Judit}, journal-iso = {ARCH HYDROBIOL SUPPL MONOGR BEITR}, journal = {ARCHIV FÜR HYDROBIOLOGIE SUPPLEMENTBAND MONOGRAPHISCHE BEITRAGE}, volume = {107}, unique-id = {1014071}, issn = {0341-2881}, year = {1997}, pages = {563-593}, orcid-numbers = {Padisák, Judit/0000-0001-8285-2896} }