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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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Benito, G., Rohde, R., Seely, M., Külls, C., Dahan, O., Enzel, Y., et al. (2010). Management of alluvial aquifers in two southern African ephemeral rivers: implications for IWRM. Water Resources Management, 24(4), 641–667.
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Klaus, J., Zehe, E., Elsner, M., Külls, C., & McDonnell, J. J. (2013). Macropore flow of old water revisited: experimental insights from a tile-drained hillslope. Hydrology and Earth System Sciences, 17(1), 103.
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Rehm-Berbenni, C., Druta A., Åberg, G., Neguer J., Külls, C., Patrizi, G., et al. (2005). Isotope Technologies Applied to the Analysis of Ancient Roman Mortars.
Abstract: Results of the CRAFT Project EVK4 CT-2001-30004
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Christofi, C., Bruggeman, A., Külls, C., & Constantinou, C. (2020). Isotope hydrology and hydrogeochemical modeling of Troodos Fractured Aquifer, Cyprus: The development of hydrogeological descriptions of observed water types. Applied Geochemistry, 123, 104780.
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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Voerkelius, S., Külls, C., Santiago, M. M. F., Frischkorn, H., dos Santos Semrau, L. A., Heinrichs, G., et al. (2003). Investigations on water management and water quality in Picos/PI and Tauá/CE. In Global change and regional impacts (pp. 173–184). Springer, Berlin, Heidelberg.
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Mahindawansha, A., Külls, C., Kraft, P., & Breuer, L. (2020). Investigating unproductive water losses from irrigated agricultural crops in the humid tropics through analyses of stable isotopes of water. Hydrology and Earth System Sciences, 24(7), 3627–3642.
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Klaus, J., & Külls, C. (2009). Integrating residence time data in mixing cell modeling-Application to the Lower Kuiseb Dune area. In EGU Geophysical Abstracts (11026).
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Külls, C., Nunes, A., Köbel-Batista, M., Branquinho, C., Bianconi, N., & Costantini, E. (2014). Integrated use of soil physical and water isotope methods for ecohydrological characterization of desertified areas. In EGU Geophysical Abstracts (15430).
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Döll, P., Krol, M., Fuhr, D., Gaiser, T., Herfort, J., Höynck, S., et al. (2003). Integrated scenarios of regional development in Ceará and Piauí. In Global Change and Regional Impacts (pp. 19–41). Springer, Berlin, Heidelberg.
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