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Author Romeo, N.; Mabry, J.; Hillegonds, D.; Kainz, G.; Jaklitsch, M.; Matsumoto, T. url  openurl
  Title Developments of a field gas extraction device and krypton purification system for groundwater radio-krypton dating at the IAEA Type Journal Article
  Year 2022 Publication (up) Applied Radiation and Isotopes Abbreviated Journal  
  Volume 189 Issue Pages 110450  
  Keywords  
  Abstract The long-lived radio-krypton isotope 81Kr (t1/2 = 2.29 × 105 yr) is an ideal tracer for old groundwater age dating in the range of 105–106 years which goes beyond the reach of radio-carbon (14C) age dating. Analytical breakthrough made over the last two decades in Atom Trap Trace Analysis (ATTA) has enabled the use of this isotope with extremely low abundance (81Kr/Kr = 6 × 10−13) to be used as a practical dating tool for very old groundwater. The International Atomic Energy Agency aims to provide this new isotope tool for better groundwater resource management of Member States and developed a field sampling device to collect dissolved gas samples from groundwater and a system to separate and purify trace amounts of krypton from the gas samples for the ATTA analysis. The design, setup and performances of our sampling and purification systems are described here. Our system can produce a high purity aliquot of about 5 μL of krypton from 5 L of air sample (recovery yield of >90%). The samples made by our system were confirmed to be acceptable for the ATTA analysis.  
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  ISSN 0969-8043 ISBN Medium  
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  Notes Approved no  
  Call Number THL @ christoph.kuells @ Romeo2022110450 Serial 214  
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Author Külls, C.; Schwarz, O. openurl 
  Title Grundwasseranreicherung in den Waldbeständen der Teninger Allmend bei Freiburg im Breisgau Type Book Chapter
  Year 2000 Publication (up) Beiträge zur Physischen Geographie Abbreviated Journal  
  Volume Issue Pages 67 - 78  
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  Corporate Author Fachbereich Geowissenschaften der Johann Wolfgang Goethe-Universität Frankfurt am Main Thesis  
  Publisher Werner-F. Bär Place of Publication Frankfurt am Main Editor  
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  Notes Approved no  
  Call Number THL @ christoph.kuells @ Serial 72  
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Author Külls, C. openurl 
  Title Rekonstruktion hydrologischer Extreme in der Namibwüste Type Journal Article
  Year 2011 Publication (up) Berichte der naturforschenden Gesellschaft zu Freiburg im Breisgau Abbreviated Journal  
  Volume Issue 101 Pages 69-81  
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  Notes Approved no  
  Call Number THL @ christoph.kuells @ Serial 71  
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Author Rajfur, M.; Kłos, A.; Wacławek, M. url  openurl
  Title Sorption properties of algae Spirogyra sp. and their use for determination of heavy metal ions concentrations in surface water Type Journal Article
  Year 2010 Publication (up) Bioelectrochemistry Abbreviated Journal  
  Volume 80 Issue 1 Pages 81-86  
  Keywords Biomonitoring, Heavy metal ions, Algae sp., Sorption kinetics, Langmuir isotherm  
  Abstract Kinetics of heavy-metal ions sorption by alga Spirogyra sp. was evaluated experimentally in the laboratory, using both the static and the dynamic approach. The metal ions – Mn2+, Cu2+, Zn2+ and Cd2+ – were sorbed from aqueous solutions of their salts. The static experiments showed that the sorption equilibria were attained in 30min, with 90-95% of metal ions sorbed in first 10min of each process. The sorption equilibria were approximated with the Langmuir isotherm model. The algae sorbed each heavy metal ions proportionally to the amount of this metal ions in solution. The experiments confirmed that after 30min of exposition to contaminated water, the concentration of heavy metal ions in the algae, which initially contained small amounts of these metal ions, increased proportionally to the concentration of metal ions in solution. The presented results can be used for elaboration of a method for classification of surface waters that complies with the legal regulations.  
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  ISSN 1567-5394 ISBN Medium  
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  Notes A Selection of Papers presented at the 4th International Workshop on Surface Modification for Chemical and Biochemical Sensing (SMCBS 2009) Approved no  
  Call Number THL @ christoph.kuells @ Rajfur201081 Serial 283  
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Author Stavi, I.; Eldad, S.; Xu, C.; Xu, Z.; Gusarov, Y.; Haiman, M.; Argaman, E. url  openurl
  Title Ancient agricultural terrace walls control floods and regulate the distribution of Asphodelus ramosus geophytes in the Israeli arid Negev Type Journal Article
  Year 2024 Publication (up) Catena Abbreviated Journal  
  Volume 234 Issue Pages 107588  
  Keywords Geo-archaeology, Hydrological connectivity, Hydrological modelling, Runoff harvesting, Soil and water conservation, Watershed management  
  Abstract Ancient stone terrace walls aimed at harvesting water runoff and facilitating crop production are widespread across the drylands of the Middle East and beyond. In addition to retaining the scarce water resource, the terrace walls also conserve soil and thicken its profile along ephemeral stream channels (wadis) by decreasing fluvial connectivity and mitigating erosional processes. In this study, we created hydrological models for three wadis with ancient stone terrace walls in the arid northern Negev of Israel, where the predominant geophyte species is Asphodelus ramosus L. A two-dimensional (2D) rain-on-grid (RoG) approach with a resolution of 2 m was used to simulate the rain events with return periods of 10, 20, 50, and 99 % (10-y, 5-y, 2-y, and yearly, respectively) based on the Intensity-Duration-Frequency rain curves for the region. To evaluate the effect of stone terrace walls on fluvial hydrology and geomorphology, the ground level was artificially elevated by 20 cm at the wall locations in a digital terrain model (DTM), using the built-in HEC-RAS 2D terrain modification tool. Our results showed that the terraced wadis have a high capacity to mitigate runoff loss, but a lesser capacity to delay the peak flow. Yet, for all rainstorm return periods, peak flow mitigation was positively related to the number of terrace walls along the stream channel. Field surveys in two of the studied wadis demonstrated that the A. ramosus clones were found in proximity to the stone terrace walls, presumably due to the greater soil–water content there. The results thus suggest that the terrace walls provide improved habitat conditions for these geophytes, supporting their growth and regulating their distribution along the wadi beds.  
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  ISSN 0341-8162 ISBN Medium  
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  Notes Approved no  
  Call Number THL @ christoph.kuells @ Stavi2024107588 Serial 229  
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