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Author Benito, G.; Rohde, R.; Seely, M.; Külls, C.; Dahan, O.; Enzel, Y.; Todd, S.; Botero, B.; Morin, E.; Grodek, T. url  doi
openurl 
  Title Management of alluvial aquifers in two southern African ephemeral rivers: implications for IWRM Type Journal Article
  Year 2010 Publication Water Resources Management Abbreviated Journal  
  Volume 24 Issue 4 Pages 641-667  
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  Publisher Springer Netherlands Place of Publication Editor  
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  Notes Approved no  
  Call Number THL @ christoph.kuells @ Benito2010management Serial 25  
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Author Mahindawansha, A.; Külls, C.; Kraft, P.; Breuer, L. url  doi
openurl 
  Title Investigating unproductive water losses from irrigated agricultural crops in the humid tropics through analyses of stable isotopes of water Type Journal Article
  Year 2020 Publication Hydrology and Earth System Sciences Abbreviated Journal  
  Volume 24 Issue 7 Pages 3627-3642  
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  Publisher Copernicus GmbH Place of Publication Editor  
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  Notes Approved yes  
  Call Number THL @ christoph.kuells @ Mahindawansha2020investigating Serial 14  
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Author Baram, S.; Ronen, Z.; Kurtzman, D.; Külls, C.; Dahan, O. url  doi
openurl 
  Title Desiccation-crack-induced salinization in deep clay sediment Type Journal Article
  Year 2013 Publication Hydrology and Earth System Sciences Abbreviated Journal  
  Volume 17 Issue 4 Pages 1533  
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  Publisher Copernicus GmbH Place of Publication Editor  
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  Area Expedition Conference  
  Notes Approved no  
  Call Number THL @ christoph.kuells @ Baram2013desiccation Serial 21  
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Author Klaus, J.; Zehe, E.; Elsner, M.; Külls, C.; McDonnell, J.J. url  doi
openurl 
  Title Macropore flow of old water revisited: experimental insights from a tile-drained hillslope Type Journal Article
  Year 2013 Publication Hydrology and Earth System Sciences Abbreviated Journal  
  Volume 17 Issue 1 Pages 103  
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  Publisher Copernicus GmbH Place of Publication Editor  
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  Notes Approved no  
  Call Number THL @ christoph.kuells @ Klaus2013macropore Serial 23  
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Author Garvelmann, J.; Külls, C.; Weiler, M. url  doi
openurl 
  Title A porewater-based stable isotope approach for the investigation of subsurface hydrological processes Type Journal Article
  Year 2012 Publication Hydrology & Earth System Sciences Abbreviated Journal  
  Volume 16 Issue 2 Pages  
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  Notes Approved no  
  Call Number THL @ christoph.kuells @ Garvelmann2012porewater Serial 24  
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Author Ola, I.; Drebenstedt, C.; Burgess, R.M.; Mensah, M.; Hoth, N.; Okoroafor, P.; Külls, C. url  doi
openurl 
  Title Assessing petroleum contamination in parts of the Niger Delta based on a sub-catchment delineated field assessment Type Journal Article
  Year 2024 Publication Environmental Monitoring and Assessment Abbreviated Journal  
  Volume 196 Issue 6 Pages 585  
  Keywords  
  Abstract The Niger Delta in Nigeria is a complex and heavily contaminated area with over 150,000 interconnected contaminated sites. This intricate issue is compounded by the region’s strong hydrological processes and high-energy environment, necessitating a science-based approach for effective contamination assessment and management. This study introduces the concept of sub-catchment contamination assessment and management, providing an overarching perspective rather than addressing each site individually. A description of the sub-catchment delineation process using the digital elevation model data from an impacted area within the Delta is provided. Additionally, the contamination status from the delineated sub-catchment is reported. Sediment, surface water and groundwater samples from the sub-catchment were analyzed for total petroleum hydrocarbons (TPH) and polycyclic aromatic hydrocarbons (PAHs), respectively. Surface sediment TPH concentrations ranged from 129 to 20,600 mg/kg, with subsurface (2-m depth) concentrations from 15.5 to 729 mg/kg. PAHs in surface and subsurface sediment reached 9.55 mg/kg and 0.46 mg/kg, respectively. Surface water exhibited TPH concentrations from 10 to 620 mg/L, while PAHs ranged from below detection limits to 1 mg/L. Groundwater TPH concentrations spanned 3 to 473 mg/L, with total PAHs varying from below detection limits to 0.28 mg/L. These elevated TPH and PAH levels indicate extensive petroleum contamination in the investigated sediment and water environment. Along with severe impacts on large areas of mangroves and wetlands, comparison of TPH and PAH concentrations with sediment and water quality criteria found 54 to 100% of stations demonstrated exceedances, suggesting adverse biological effects on aquatic and sediment biota are likely occurring.  
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  ISSN 1573-2959 ISBN Medium  
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  Notes Approved no  
  Call Number THL @ christoph.kuells @ Ola2024 Serial 290  
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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 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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  Language english Summary Language english Original Title  
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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 Joseph, J.; Külls, C.; Arend, M.; Schaub, M.; Hagedorn, F.; Gessler, A.; Weiler, M. doi  openurl
  Title Application of a laser-based spectrometer for continuous in situ measurements of stable isotopes of soil CO2 in calcareous and acidic soils Type Journal Article
  Year 2019 Publication Soil Abbreviated Journal  
  Volume 5 Issue 1 Pages 49-62  
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  Publisher Copernicus Place of Publication Editor  
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  Notes Approved no  
  Call Number THL @ christoph.kuells @ Joseph2019application Serial 15  
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Author Jin, Z.; Külls, C. doi  openurl
  Title FDM based OA-ICOS for high accuracy 13C quantification in gaseous CO2 Type Journal Article
  Year 2020 Publication Earth and Environmental Science Abbreviated Journal EES  
  Volume 446 Issue 3 Pages 032061  
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  Series Editor Series Title IOP Conference Series Abbreviated Series Title  
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  Notes Approved no  
  Call Number THL @ christoph.kuells @ Jin2020fdm Serial 16  
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Author Külls, C. doi  openurl
  Title Ecohydrological principles in economic models of water resources in drylands and desert restoration Type Miscellaneous
  Year 2014 Publication UNCCD, 2nd Scient. Conf. Abbreviated Journal  
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  Call Number THL @ christoph.kuells @ Kuells2014ecohydrological Serial 68  
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