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Host City Krems of 44. IAD Conference (6.Febr-9.Febr 2023), Austria: photo credit: Stadt Krems
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Danube River, 44.IAD Conf Krems (8.2.2023), Wachau, Austria photo credit: Віктор Вишневський (UA)
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Danube River Excursion, 44.IAD Conf Krems (8.2.2023), Wachau (near Grimsing), Austria photo: K.Teu
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Danube stretch in winter mood, Romania, 2010 photo credit: Harald Kutzenberger
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Map of the Danube River Basin and IAD-countries photo credit: several authors
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Children's Book by Sandu, Vahtar and Miękisz (2020), English Book & Translations credit: book illustrations
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Children's Book by Sandu, Vahtar and Miękisz (2020), Multilingual Translations credit: book illustrations
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Veľkolélsky island, Danube floodplain, Slovakia, 2022 photo credit: Katrin Teubner
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Danube channel, Romania photo credit: Cristina Sandu
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Children's Book by Sandu, Vahtar and Miękisz (2020), Translation into Romanian credit: book illustrations
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Sturgeon, Romania photo credit: Viorel Gavrila
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Veľkolélsky island, Corbicula sp., Slovakia. 2022 photo credit: Katrin Teubner
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Veľkolélsky island, Slovakia, 2022 photo credit: Katrin Teubner
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Danube sidearm near Gabčíkovo dam, Slovakia, 2022 photo credit: Katrin Teubner
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Children's Book by Sandu, Vahtar and Miękisz (2020), English credit: book illustrations
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Channel Danube Delta, Romania photo credit: Cristina Sandu
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Children's Book by Sandu, Vahtar and Miękisz (2020), Colouring Books credit: book illustrations
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Daube river at Bratislava, Slovakia, 2022photo credit: Katrin Teubner
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Danube River floodplain forest, Hedera helix, Austria, 2023photo credit: Katrin Teubner
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Children's Book by Sandu, Vahtar and Miękisz (2020), Translation into Serbian credit: book illustrations
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Danube River Excursion, 44.IAD Conf Krems (8.2.2023), Wachau (Rossitz-Rührdorf), Austria photo: K.Teu
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Fish catch boats in Gemenc, Hungary, 2007 photo credit: Katrin Teubner
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Gemenc fishery, Hungary, 2007 photo credit: Katrin Teubner
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Children's Book by Sandu, Vahtar and Miękisz (2020), Translation into Hungarian credit: book illustrations
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Fisherboats at village Mila, Romania, 2005 photo credit: Katrin Teubner
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Fisherboat, Romania, 2005 photo credit: Nicolae S.P.
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Fishermen boat, Romania photo credit: Cristina Sandu
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Danube stretch in Orsova, Romania, 2005 photo credit: Katrin Teubner
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Hydromorphological assessment for Danube tributaries: Drava and Mura photo credit: Ulrich Schwarz
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Children's Book by Sandu, Vahtar and Miękisz (2020), Translation into Croatian credit: book illustrations
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Danube stretch in Gemenc, Hungary, 2007 photo credit: Katrin Teubner
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Danube side channel, Romania, 2005 photo credit: Nicolae S.P.
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Children's Book by Sandu, Vahtar and Miękisz (2020), Translation into German credit: book illustrations
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Danube Schönau, Austria, 2013 photo credit: Katrin Teubner
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Egrets at Channel Danube Delta, Romania, 2016 photo credit: Cristina Sandu
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Danube Delta, pelicans, Romania photo credit: Cristina Sandu
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Danube Delta, pelican colony, Romania photo credit: Cristina Sandu
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Veľkolélsky island, Slovakia, 2022photo credit: Katrin Teubner
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Horses in the Danube Delta, Romania photo credit: Cristina Sandu
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Danube, Romania, 2005 photo credit: Katrin Teubner
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Danube, Romania photo credit: Nicolae Găldean
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Danube, Romania photo credit: Nicolae Găldean
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Danube at Visegrád, Hungary, 2019 photo credit: Mária Dinka
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Danube stretch at town Dürnstein, Austria, 2013 photo credit: Katrin Teubner
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Danube Delta, Chironomidae at Lake Puiu, Romania, 2005 photo credit: Katrin Teubner
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Children's Book by Sandu, Vahtar and Miękisz (2020), Translation into Bulgarian credit: book illustrations
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Danube Delta, Grey Herons, Romania, 2005 photo credit: Nicolae S.P.
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Danube Delta, Yellow Water Lily, Romania photo credit: Cristina Sandu
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Danube Delta, stork nest, Romania photo credit: Cristina Sandu
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Hydroelectric power plant Gabčíkovo, Slovakia, 2018 photo credit: Katrin Teubner
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Iron Gates hydroelectric power plant, Romania, 2005 photo credit: Katrin Teubner
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Macrophytes in the Danube Delta, Yellow Water Lily, Romania, 2005 photo credit: Katrin Teubner
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Channel Danube Delta, White Water Lily, Nymphaea alba, Romania, 2005 photo credit: Nicolae Ş.P.
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Floodplain Danube Delta, 2005 photo credit: Nicolae Ş.P.
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Danube Delta, White Water Lily, Nymphaea alba, Romania photo credit: Cristina Sandu
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Children's Book by Sandu, Vahtar and Miękisz (2020), Translation into Ukrainian credit: book illustrations
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Floodplain Danube Delta, egrets, 2005 photo credit: Nicolae Ş.P.
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Floodplain Danube Delta, egrets, 2005 photo credit: Nicolae Ş.P.
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Floodplain near Gabčíkovo, Slovakia, 2018 photo credit: Katrin Teubner
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Iron Gates hydroelectric power plant, Romania, 2005 photo credit: Katrin Teubner
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Alte Donau, Vienna, Austria, 2018 photo credit: Katrin Teubner
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Phragmites australis in the Danube Delta, Romania, 2005 photo credit: Katrin Teubner
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Channel Danube Delta, Romania, 2016 photo credit: Cristina Sandu
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Floodplain at Gabčíkovo, Slovakia, 2018 photo credit: Katrin Teubner
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Danube, Romania, 2005 photo credit: Nicolae S.P.
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Danube, during low water level, Romania, 2005 photo credit: Nicolae S.P.
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Hydroelectric power plant Grafenwoerth, Vienna, Austria, 2018 photo credit: Katrin Teubner
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Danube, Romania photo credit: Nicolae Găldean
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Phragmites australis in the Danube Delta, Romania, 2005 photo credit: Katrin Teubner
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Channel Danube Delta, Romania, 2005 photo credit: Nicolae S.P.
Biotic Processes
Fachgruppenleiter/Co-ordinator: Prof. Dr. Thomas HEIN
Überblick
Die Fachgruppe "Stoffhaushalt" bearbeitet die Stoffumsetzungen in der Donau, die als Teilprozesse des Sauerstoffhaushalts und als Stoffumsetzungen im Nahrungsnetz die Wasserbeschaffenheit und den ökologischen Zustand prägen. Damit stellt sie ein Bindeglied dar zwischen den Fachdisziplinen, die sich mit dem abiotischen Zustand befassen (Hydrologie, Morphologie, Chemie) und den biologischen Fachdisziplinen. Die meisten der betrachteten Prozesse werden durch Organismen bewerkstelligt. Darüber hinaus sind jedoch zum Verständnis des Stoffhaushaltes aber auch die abiotischen Prozesse wie Gasaustausch und Sedimentation zu betrachten.
Als Methoden zur Erfassung von Stoffumsetzungen stehen Labor- und in situ -Messungen zur Verfügung. Eine häufig bestimmte Messgröße ist der Sauerstoffumsatz einer Wasserprobe, so etwa beim Biochemischen Sauerstoffverbrauch durch den Abbau von Kohlenstoffverbindungen, beim Nitrifikationssauerstoffverbrauch und bei der Sauerstoffproduktion der Algen. Darüber hinaus kann die Auswertung von Tag-Nachtgangkurven des Sauerstoffgehalts und anderen Messgrößen wertvolle Aussagen liefern.
Zusätzlich zur Messung von Stoffumsetzungen gewinnt die mathematische Simulation immer mehr an Bedeutung. Mit ihrer Hilfe können einerseits die Auswirkungen wasserbaulicher und wassergütewirtschaftlicher Maßnahmen prognostiziert werden andererseits können die Teilprozesse des Stoffhaushalts analysiert, Datenlücken geschlossen und die Ursachen für Defizite ermittelt werden. Eine der in den nächsten Jahre zu bearbeitende Thematik soll daher die modellgestützte Untersuchung des "Einflusses wasserwirtschaftlicher Maßnahmen und von Wasserbauwerken auf das ökologische Wirkungsgefüge und die Wasserqualität der Donau sein. Wobei die von der IKSD und anderen Institutionen gesammelten Daten analysiert und interpretiert werden sollen.
Neben der Durchführung von Forschungsprojekten steht bei der Arbeit der Fachgruppe der Erfahrungsaustausch und in der Unterstützung von Informationsbesuchen im Vordergrund.
Overview
The expert group "Biotic processes" works on the water quality of Danube river, especially on the compounds of the oxygen budget and the foodweb. Therefore the expert group links the knowledge of specialists working in the abiotic fields as hydrology, morphology and chemistry with that of biologists. Most of the processes concerned are subject of the metabolism of organism. Nevertheless, for understanding of the material balance abiotic processes as gas exchange and sedimentation has to be regarded too.
The measurement of processes laboratory methods and in situ methods are available. A currently used method is the determination of the oxygen turnover in water samples, as Biochemical Oxygen Demand, Oxygen Demand due to nitrification and Oxygen production by algae. Further more the analyses of diurnal curves of the oxygen content and of other measuring parameters can give valuable information on the processes in a river.
In addition to the measurement of turnover rates, the mathematical simulation is of increasing importance. It can be used to evaluate the impact of hydraulic constructions and other measures on water quality. Additionally modelling is helpful to analyse the processes of the oxygen budget, to close gaps in data, and to analyse causes of ecological deficits. Therefore one of the subjects to work on during next years will be the model-based analyses of the "Impact of water management measures and hydraulic structures on ecological interactions and water quality in River Danube". Where data of ICPDR and other institutions shall be analysed and interpreted.
Besides the research activities the work of the expert group is focused on exchange of experiences and support of information visits.