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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
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  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 (down) 641-667  
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  Publisher Springer Netherlands Place of Publication Editor  
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  Call Number THL @ christoph.kuells @ Benito2010management Serial 25  
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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 (down) 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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  ISSN 1573-2959 ISBN Medium  
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  Call Number THL @ christoph.kuells @ Ola2024 Serial 290  
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Author Davila, P.; Külls, C. openurl 
  Title Reliability of current CFC data for age dating of water Type Conference Article
  Year 2010 Publication EGU Geophysical Abstracts Abbreviated Journal  
  Volume Issue Pages (down) 536  
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  Call Number THL @ christoph.kuells @ Davila2010reliability Serial 49  
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Author Dahan, O.; Tatarsky, B.; Enzel, Y.; Külls, C.; Seely, M.; Benito, G. url  doi
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  Title Dynamics of flood water infiltration and ground water recharge in hyperarid desert Type Journal Article
  Year 2008 Publication Groundwater Abbreviated Journal  
  Volume 46 Issue 3 Pages (down) 450-461  
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  Publisher Blackwell Publishing Inc Malden, USA Place of Publication Editor  
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  Call Number THL @ christoph.kuells @ Dahan2008dynamics Serial 27  
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Author Külls, C.; Adar, E.M.; Udluft, P. openurl 
  Title Tracer Studies and Modelling of Regional Groundwater Systems-Resolving patterns of groundwater flow by inverse hydrochemical modelling in a semiarid Kalahari basin Type Journal Article
  Year 2000 Publication IAHS Publications-Series of Proceedings and Reports-Intern Assoc Hydrological Sciences Abbreviated Journal  
  Volume 262 Issue Pages (down) 447-452  
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  Publisher Wallingford [Oxfordshire]: IAHS, 1981- Place of Publication Editor  
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  Call Number THL @ christoph.kuells @ Kuells2006 Serial 31  
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