Adolph, G., KÜlls, C., & Willscheid, A. (2007). Determination and validation of age structures as an improved measure of hydrological dynamics. In Geophysical Research Abstracts (Vol. 9).
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Tröger, U., Dias, C. L., Guillaumon, J. R., Iritani, M. A., Külls, C., & Schuler, G. (2004). Remarks and new data about the recharge of the Guarani Aquifer System. In XXXIII IAH Congress, Abstracts, IAH, Mexico.
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Klock, H., Külls, C., & Udluft, P. (2001). Estimating recharge values using hydrochemical and geological data: a case study from the. In Impact of Human Activity on Groundwater Dynamics: Proceedings of an International Symposium (Symposium S3) Held During the Sixth Scientific Assembly of the International Association of Hydrological Sciences (IAHS) at Maastricht, The Netherlands, from 18 t (25).
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Constantinou, C., & Udluft, P. (2000). Mapping the availability and dynamics of groundwater recharge. Part 2: Case studies from Mediterranean Basins. In Proceedings of Third Congress on Regional Geological Cartography and Information Systems (pp. 163–168).
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Külls, C. (2000). Resolving patterns of groundwater flow by inverse hydrochemical modelling in a semiarid Kalahari. In Tracers and Modelling in Hydrogeology: TraM’2000: Proceedings of TraM’2000, the International Conference on Tracers and Modelling in Hydrogeology Held at Liège, Belgium, in May 2000 (447).
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Udluft, P., & Külls, C. (2000). Mapping the availability and dynamics of groundwater recharge. Part 1: modelling techniques. In Proceedings of the Third Congress on Regional Geological Cartography and Information Systems (pp. 337–340).
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Külls, C., Jobin, J., & Weiler, M. (2015). Environmental analytics for water carbon management: enable WCM: Schlussbericht. Albert Ludwigs Universität, Professur für Hydrologie.
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Udluft, P., Dünkeloh, A., Mederer, J., Külls, C., & Schaller, J. (2006). Re-evaluation of the groundwater resources of Cyprus. Lefkosia.
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Adar, E. M., & Külls, C. (2002). MCM sf–Mixing-cell model for a steady flow MIG–Mixing-cell input generator: A short manual for installation and operation of MCM sf using the MIG–mixing-cell input generator.
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Heaton, T. H. E., Talma, A. S., & Vogel, J. C. (1983). Origin and history of nitrate in confined groundwater in the western Kalahari. Journal of Hydrology, 62(1), 243–262.
Abstract: Data are presented for nitrate, dinitrogen and argon concentrations and 15N14N ratios in groundwater, with radiocarbon ages up to 40,000 yr. for three confined sandstone aquifers in the western Kalahari of South West Africa/Namibia. The nitrate is probably generated within the soil of the recharge areas, and its production rate during the period 3000-40,000 B.P. has remained between 0.5 and 1.6 meq NO−3l−1 of recharge water, with ° 15N between + 4 and + 8‰. Variations in the amount of nitrate and of “excess air” in groundwater recharge are found, and can only reflect changes in the environmental conditions during recharge. They must therefore be caused by the climatic changes that have taken place during the past 25,000 yr.
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