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Author Christofi, C.; Bruggeman, A.; Külls, C.; Constantinou, C. url  openurl
  Title Isotope hydrology and hydrogeochemical modeling of Troodos Fractured Aquifer, Cyprus: The development of hydrogeological descriptions of observed water types Type Journal Article
  Year 2020 Publication Applied Geochemistry Abbreviated Journal  
  Volume 123 Issue (down) Pages 104780  
  Keywords Isotope hydrology, Hydrogeochemical modelling, Hydrochemistry, Kargiotis, Troodos  
  Abstract The origin of groundwater recharge and subsequent flow paths are often difficult to establish in fractured, multi-lithological, and highly compartmentalized aquifers such as the Troodos Fractured Aquifer (TFA). As the conjunctive use of stable isotopes and hydrogeochemical data provides additional information, we established a monitoring network for stable isotopes in precipitation in Cyprus. The local meteoric water line, altitude effect and seasonal variation of stable isotopes in precipitation are derived from monitoring data. Stable isotopes and hydrogeochemical data are combined to model water-rock interactions and groundwater evolution along a complete ophiolite sequence. As a result a generic hydrogeologic description for the observed water types is developed. Isotope hydrology was applied in conjunction with hydrogeochemical modelling in Kargiotis Watershed, a major north-south transect of the TFA. PHREEQC was used for hydrogeochemical modelling to establish generic descriptions for observed water types. Mean precipitation-weighted values from 16 monitoring stations were used to calculate the Local Meteoric Water Line (LMWL), which was found to be equal to δ2H = (6.58 ± 0.13)*δ18O + (12.64 ± 0.91). A general decrease of 1.22‰ for δ2H and 0.20‰ for δ18O in precipitation was calculated per 100 m altitude. A generic groundwater evolution path was established: 1. Na/MgClHCO3, 2. MgHCO3, 3. Ca/MgHCO3, 4. Ca/MgNaHCO3, 4a. MgNa/CaHCO3/Cl, 5. NaMg/CaHCO3/Cl, 6. NaHCO3, 7. Na/MgHCO3SO4, 8. NaSO4Cl/HCO3. Hydrogeologic descriptions, consisting of groundwater origin, flow path and possible active water-rock processes, have been realised for the observed water types. The first two water types occur in serpentine and ultramafic-gabbro springs. Type 3 waters represent early stages of recharge and/or short flow paths, in gabbro whereas types 4 and 5 are typical for further percolating waters in gabbro and diabase. Water types 6 and 7 occur both in diabase and in the basal group and represent the regional flow. Water type 8 is the end member of regional, upwelling groundwater in the basal group. The presented descriptions and methods have practical applications in groundwater exploration, characterization, and protection. The methodology can be applied in other complex aquifer systems.  
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  ISSN 0883-2927 ISBN Medium  
  Area Cyprus Expedition Conference  
  Notes Approved no  
  Call Number THL @ christoph.kuells @ Christofi2020104780 Serial 76  
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Author Krüger, N.; Külls, C.; Bruggeman, A.; Eliades, M.; Christophi, C.; Rigas, M.; Eracleous, T. openurl 
  Title Groundwater recharge estimates with soil isotope profiles-is there a bias on coarse-grained hillslopes? Type Conference Article
  Year 2020 Publication EGU General Assembly Conference Abstracts Abbreviated Journal  
  Volume Issue (down) Pages 9840  
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  Call Number THL @ christoph.kuells @ Krueger2020groundwater Serial 42  
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Author Külls, C.H.; Eichinger, F.; Fader, H.J.; Leistert, H.; Lorenz, G.; Szakacs, E. openurl 
  Title New Environmental Analytical Techniques to Monitor Carbon Sequestration Type Conference Article
  Year 2011 Publication 1st EAGE Sustainable Earth Sciences (SES) Conference and Exhibition Abbreviated Journal  
  Volume Issue (down) Pages 268  
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  Area Expedition Conference European Association of Geoscientists & Engineers  
  Notes Approved no  
  Call Number THL @ christoph.kuells @ Kuells2011new Serial 47  
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Author Frey, S.; Külls, C.; Schlosser, C. openurl 
  Title New Hydrological Age-Dating techniques using cosmogenic radionuclides Beryllium-7 and Sodium-22 Type Conference Article
  Year 2011 Publication Proc. IAEA Conf. Monacco Abbreviated Journal  
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  Call Number THL @ christoph.kuells @ Frey2011new Serial 48  
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Author Adolph, G.; Römer, T.; Külls, C. openurl 
  Title Deriving complex groundwater age structure by combining age dating and analytic element modelling Type Conference Article
  Year Publication G-DAT 2008-Leipzig Abbreviated Journal  
  Volume Issue (down) Pages 12  
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  Call Number THL @ christoph.kuells @ Adolph2008deriving Serial 55  
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Author Külls, C.; Haering, M.; Leistert, H.; Oster, H. openurl 
  Title Hydrological, physical and chemical constraints for groundwater age dating with CFC and SF6 Type Conference Article
  Year Publication G-DAT 2008-Leipzig Abbreviated Journal  
  Volume Issue (down) Pages 29  
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  Call Number THL @ christoph.kuells @ Kuells2008hydrological Serial 57  
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Author Tröger, U.; Dias, C.L.; Guillaumon, J.R.; Iritani, M.A.; Külls, C.; Schuler, G. openurl 
  Title Remarks and new data about the recharge of the Guarani Aquifer System Type Conference Article
  Year 2004 Publication XXXIII IAH Congress, Abstracts, IAH, Mexico Abbreviated Journal  
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  Call Number THL @ christoph.kuells @ Troeger2004remarks Serial 59  
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Author Udluft, P.; Külls, C. openurl 
  Title Mapping the availability and dynamics of groundwater recharge. Part 1: modelling techniques Type Conference Article
  Year 2000 Publication Proceedings of the Third Congress on Regional Geological Cartography and Information Systems Abbreviated Journal  
  Volume Issue (down) Pages 337-340  
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  Call Number THL @ christoph.kuells @ Udluft2000mapping Serial 64  
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Author Külls, C.; Jobin, J.; Weiler, M. openurl 
  Title Environmental analytics for water carbon management: enable WCM: Schlussbericht Type Report
  Year 2015 Publication Abbreviated Journal  
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  Publisher Albert Ludwigs Universität, Professur für Hydrologie Place of Publication Editor  
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  Call Number THL @ christoph.kuells @ Kuells2015environmental Serial 65  
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Author Udluft, P.; Dünkeloh, A.; Mederer, J.; Külls, C.; Schaller, J. openurl 
  Title Re-evaluation of the groundwater resources of Cyprus Type Report
  Year 2006 Publication Abbreviated Journal  
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  Publisher Lefkosia Place of Publication Editor  
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  Notes Approved no  
  Call Number THL @ christoph.kuells @ Udluft2006re Serial 66  
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