{"id":43024,"date":"2017-01-27T10:59:14","date_gmt":"2017-01-27T09:59:14","guid":{"rendered":"https:\/\/uniavisen.dk\/en\/event\/sascha-mueller-ign-defendes-his-thesis-about-stable-oxygen-18-and-deuterium-isotopes\/"},"modified":"2017-02-01T13:59:23","modified_gmt":"2017-02-01T12:59:23","slug":"sascha-mueller-ign-defendes-his-thesis-about-stable-oxygen-18-and-deuterium-isotopes","status":"publish","type":"event","link":"https:\/\/uniavisen.dk\/en\/event\/sascha-mueller-ign-defendes-his-thesis-about-stable-oxygen-18-and-deuterium-isotopes\/","title":{"rendered":"Sascha M\u00fcller, IGN, defends his thesis about stable Oxygen-18 and Deuterium Isotopes"},"content":{"rendered":"

Sascha M\u00fcller<\/strong> <\/em>defends his thesis:<\/p>\n

Stable Oxygen-18 and Deuterium Isotopes<\/strong>
\nApplications in a maritime-temperate lowland environment<\/p>\n

Supervisors:<\/strong>
\nProfessor Peter Engesgaard, IGN
\nAssistant Professor S\u00f8ren Jessen, IGN
\nSenior Researcher Torben Sonnenborg, GEUS<\/p>\n

Assessment Committee:<\/strong>
\nProfessor Gudrun Massmann, University of Oldenburg – Germany
\nProfessor Bj\u00f8rn Kl\u00f8ve, University of Oulu – Finland
\nProfessor Karsten H\u00f8gh Jensen (chair), IGN<\/p>\n

Summary:<\/strong>
\nThe application of stable Oxygen-18 (18O) and Deuterium (2H) isotopes, as a tracer for fluxes between different compartments of the water cycle was subject of the present PhD-thesis. During a three year period, temporal data from a wide range of water cycle constituents was collected from the Skjern River catchment, Denmark. The presented applications focused on studying the isotopic ‘input signal’ to the hydrosphere in the form of precipitation, the isotopic ‘output signal’ with its related dynamic processes at a coastal saltwater-freshwater interface (groundwater isotopes) and the temporal development within a given lowland headwater catchment (stream water isotopes).<\/p>\n

Based on our investigations on the precipitation isotopic composition a local meteoric water line (LMWL) was constructed and expressed as: \u03b42H=7.4 \u03b418O + 5.36\u2030. Moreover, we showed that under maritime temperature climate influence, humidity is the main driver for the temporal and spatial isotopic development and temperature plays only a secondary role.
\nBased on our investigations at a coastal lagoon aquifer we could improve quantifications of seasonal saltwater-wedge dynamics, based on isotopic tracers combined with salinity. We can link the observed seasonal regression\/transgression pattern to the inland recharge cycle, which is expressed in hydraulic head configuration and submarine groundwater discharge rates at the fieldsite. Nonetheless, those observed dynamics could not be simulated due to numerical limitations.<\/p>\n

By the use of different transit time estimation methods, comparing \u00a0isotopic input signal (precipitation) to the isotopic output signal of a catchment (as stream isotopic compositions) mean transit times (MTT) for a headwater catchment were derived. Estimates suggested the stream water to be dominated by water of very young age. Those results are in contrast to earlier age estimations from groundwater samples just beneath the stream. We therefore suggest the conceptualization of the hydrological conditions at this headwater catchment to be revised.<\/p>\n

The thesis is available for inspection at the PhD administration office, 03.1.353<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

Sascha M\u00fcller defends his thesis: Stable Oxygen-18 and Deuterium Isotopes Applications in a maritime-temperate lowland environment Supervisors: Professor Peter Engesgaard, IGN Assistant Professor S\u00f8ren Jessen, IGN Senior Researcher Torben Sonnenborg, GEUS Assessment Committee: Professor Gudrun Massmann, University of Oldenburg – Germany Professor Bj\u00f8rn Kl\u00f8ve, University of Oulu – Finland Professor Karsten H\u00f8gh Jensen (chair), IGN […]<\/p>\n","protected":false},"author":11,"featured_media":0,"template":"","class_list":["post-43024","event","type-event","status-publish","hentry","event_category-phd-thesis-defense"],"acf":[],"aioseo_notices":[],"yoast_head":"\nSascha M\u00fcller, IGN, defends his thesis about stable Oxygen-18 and Deuterium Isotopes<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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