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Vortragsreihe Ökologie und Umweltforschung WS 2018/19

Donnerstag 12:00-13:30 H6, Geo

Dr. Ben Gilfedder
Limnological Research Station, BayCEER, UBT (Homepage)
Donnerstag, 08.11.2018 12:00-13:30 :

Groundwater - Surface Water Exchange: From Mountains to the Sea

Groundwater-surface water exchange is often a controlling factor in water resource management, ecosystem health and material cycling in river networks. However it is often overlooked when assessing water allocations, aquatic ecosystem services and stream vulnerability. This is often due to departmental separation between hydrology and hydrogeology, the invisible often diffusive flux of groundwater to surface waters, and the availability of robust methods to quantify water exchange at the catchment scale. It is also due to the difficulty in obtaining representative values in heterogeneous groundwater systems for standard parameters such as the hydraulic conductivity, or chloride concentrations. This is especially due for chloride in Europe, where groundwater chloride concentrations are extremely variable compared to arid and semi-arid countries such as Australia. In this presentation I will focus on the use of radon-222 (222Rn) as a quantitative tracer for groundwater discharge to streams and lakes from the headwaters to the dynamic coastal regime. 222Rn is produced in the groundwater system through decay of 238U series isotope 226Ra. The ubiquitous presence of 238U in the mineral matrix of aquifer and stream sediments results in a consistently and significantly higher 222Rn concentration in groundwater than surface water. This emanation from the aquifer matrix can be used for two different purposes in groundwater-surface water studies: 1) to quantify groundwater discharge to rivers on km scales using mass-balance, and 2) calculate residence times of young surface water in river and bank sediments (e.g. hyporheic zone) on times scales of up to 20 days. In particular the large contrasting activities between surface water and groundwater means that 222Rn can be used in many different environments to trace water flows at the groundwater surface water interface. New developments in 222Rn methodologies mean that it can be measured in point samples in the field or on-line using continuous measurement devices to trace the dynamic of groundwater-surface water exchange in a diverse array of environments. By combining water fluxes from the 222Rn analysis and chemical measurements it is also possible to estimate turnover of contaminants such as nitrate in the hyporheic zone. This will be the primary focus of this presentation.

-  midterm habilitation lecture -

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Dr. Folkert Bauer
Crop Protection - Environmental Fate Modelling, BASF, Ludwigshafen
Fate of chemical plant protection products [Abstract]

Dr. Ben Gilfedder
Limnological Research Station, BayCEER, UBT
Groundwater - Surface Water Exchange: From Mountains to the Sea [Abstract]

Dr. Andreas Schweiger
Plant Ecology, BayCEER, University of Bayreuth
How to tackle nonlinear and disequilibrium responses in ecology and environmental research [Abstract]

Prof. Dr. Michael Pester
Leibniz Institute DSMZ & Technical University of Braunschweig
New aspects of microbial sulfur cycling: from novel sulfate reducers to pyrite-forming microorganisms [Abstract]

Dr. Kyle Mason-Jones
Netherlands Institute of Ecology (NIOO-KNAW), Wageningen, NL
Microbial storage compounds in soil: a neglected dimension of the carbon cycle [Abstract]

Prof. Dr. Andreas Römpp
Bioanalytical Sciences and Food Analysis, University of Bayreuth
High resolution mass spectrometry in environmental sciences and beyond. [Abstract]

Dr. Annette Freibauer
Bavarian State Research Centre for Agriculture, Institute of Organic Farming, Soil and Resource Management
POSTPONED: From research to agro-environmental policy: success stories for biodiversity conservation [Abstract]

Prof. Dr. Eva Lehndorff
Soil Ecology, BayCEER, University of Bayreuth
Hot spots of C turnover in soil [Abstract]
S21, GEO

BayCEER Mitgliederversammlung

Dr. Sven Frei
Hydrology, BayCEER, University of Bayreuth
Mikroplastik in hydrologischen Systemen [Abstract]

Dr. Jörg Schaller
Environmental Geochemistry, BayCEER, University of Bayreuth
Biogeochemie arktischer Permafrostböden [Abstract]
Terminplanung und Vortragsarchiv BayCEER Kolloquium (seit 2008) sowie Geoökologisches Kolloquium (ab 2001)
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