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Author Külls, C.; Salameh, E.; Udluft, P. openurl 
  Title Assessing water supplies for irrigation-availability of natural resources and sustainability indices Type Conference Article
  Year 2000 Publication Tropentag Hoffenheim Abbreviated Journal  
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  Call Number THL @ christoph.kuells @ Kuells2000assessing Serial 63  
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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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Author Külls, C.; Bittner, A. openurl 
  Title Passive barriers for long-term containment of Uranium and Vanadium Type Miscellaneous
  Year 2013 Publication IMWA Conf. Abbreviated Journal  
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  Call Number THL @ christoph.kuells @ Kuells12013passive Serial 69  
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Author Külls, C.; Bittner, A.; Marx, V. openurl 
  Title Strategic Assessment of Water Resources for the Erongo Uranium Province Type Miscellaneous
  Year 2013 Publication IMWA Conf. Abbreviated Journal  
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  Call Number THL @ christoph.kuells @ Kuells2012strategic Serial 70  
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Author Külls, C. openurl 
  Title Rekonstruktion hydrologischer Extreme in der Namibwüste Type Journal Article
  Year 2011 Publication Berichte der naturforschenden Gesellschaft zu Freiburg im Breisgau Abbreviated Journal  
  Volume Issue 101 Pages 69-81  
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  Call Number THL @ christoph.kuells @ Serial 71  
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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 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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  Call Number THL @ christoph.kuells @ Serial 72  
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Author Rehm-Berbenni, C.; Druta A.; Åberg, G.; Neguer J.; Külls, C.; Patrizi, G.; Pacha, T.; Kienzle, P.; Bugini, R.; Fiore, M.G. openurl 
  Title Isotope Technologies Applied to the Analysis of Ancient Roman Mortars Type Book Whole
  Year 2005 Publication European Commission Abbreviated Journal  
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  Abstract Results of the CRAFT Project EVK4 CT-2001-30004  
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  Call Number THL @ christoph.kuells @ Serial 73  
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Author Gunkel, A. Külls, C. openurl 
  Title Towards agent-based modelling of stakeholder behaviour – a pilot study on drought vulnerability of decentral water supply in NE Brazil Type Journal Article
  Year 2006 Publication International Congress on Environmental Modelling and Sofware Abbreviated Journal  
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  Abstract 3rd International Congress on Environmental Modelling and Sofware – Burlington, Vermont  
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  Call Number THL @ christoph.kuells @ Serial 74  
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Author Külls, C. openurl 
  Title Demonstration des Potentials der Nitrat-Isotopenanalytik für die Strategieentwicklung der Sanierung Nitrat-belasteter Brunnen Type Report
  Year 2004 Publication Umweltbundesamt Abbreviated Journal  
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  Abstract Demonstration des Potentials der Nitrat-Isotopenanalytik für die Strategieentwicklung der Sanierung Nitrat-belasteter Brunnen  
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  Call Number THL @ christoph.kuells @ Serial 75  
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Author Ola, I.; Drebenstedt, C.; Burgess, R.M.; Mensah, M.; Hoth, N.; Okoroafor, P.; Külls, C. url  doi
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  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  
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  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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  Call Number THL @ christoph.kuells @ Ola2024 Serial 290  
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