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Publikationen

Zusammenfassung der Publikationen bei Scholar (Google), ORCID oder ResearchID. Mein Profil bei Research Gate enthält Links zu Publikationen, weitere Referenzen finden sich in einer Datenbank mit eigenen Publikationen und einer Datenbank mit Publikationen zu unseren Forschungs- und Arbeitsthemen (Zotero und Mendeley). Zu laufenden Forschungsprojekten gibt Bibliographien auf Bibsonomy.

Monographien, Berichte, Skipte

2024 (3)

Ozgur Kisi, Hazi Mohammad Azamathulla, Fatih Cevat, Christoph Külls, Mehdi Kuhdaragh, Mehdi Fuladipanah (2024) Enhancing river flow predictions: Comparative analysis of machine learning approaches in modeling stage-discharge relationship. Results in Engineering 22 pp. 102017. doi web bibtex

@article{KISI2024102017,
title = {Enhancing river flow predictions: Comparative analysis of machine learning approaches in modeling stage-discharge relationship},
journal = {Results in Engineering},
volume = {22},
pages = {102017},
year = {2024},
issn = {2590-1230},
doi = {https://doi.org/10.1016/j.rineng.2024.102017},
url = {https://www.sciencedirect.com/science/article/pii/S2590123024002706},
author = {Ozgur Kisi and Hazi {Mohammad Azamathulla} and Fatih Cevat and Christoph Külls and Mehdi Kuhdaragh and Mehdi Fuladipanah},
keywords = {Stage, Discharge, Artificial neural networks, Neuro-fuzzy, Rating curve, Estimation},
abstract = {Streamflow, a pivotal variable in water resources management, holds profound significance in shaping the decision-making processes of hydrologic projects. This paper tries to delve into the exploration of the stage-discharge relationship using three machine learning methods (MLMs) namely multi-layer neural networks (MLNN), radial basis neural networks (RBNN), and neuro-fuzzy systems (ANFIS) to predict and simulate mean daily stage-discharge data derived from two monitoring stations, Bulakbasi and Karaozü, Kizilirmak River, Turkey. Root mean square error (RMSE), Mean absolute percentage error (MAPE), coefficient of determination (R2), and the Developed Discrepancy Ratio (DDR) metrics were utilized to MLMs' performance assessment. The performance evaluation indices (RMSE, MAEP, R2, DDR) for the preeminent MLNN model applied to Bulakhbashi and Karasu stations were determined as (0.29, 1.57, 0.9998, 17.62) and (1.71, 6.56, 0.9980, 6.65), respectively. The MLNN model contributed to a notable enhancement in the RMSE performance index for the aforementioned stations, exhibiting improvements of 87% and 56%, respectively. These results affirm the MLNN's proficiency in accurately capturing the stage-discharge at both monitoring stations.}
}

Abstract Streamflow, a pivotal variable in water resources management, holds profound significance in shaping the decision-making processes of hydrologic projects. This paper tries to delve into the exploration of the stage-discharge relationship using three machine learning methods (MLMs) namely multi-layer neural networks (MLNN), radial basis neural networks (RBNN), and neuro-fuzzy systems (ANFIS) to predict and simulate mean daily stage-discharge data derived from two monitoring stations, Bulakbasi and Karaozü, Kizilirmak River, Turkey. Root mean square error (RMSE), Mean absolute percentage error (MAPE), coefficient of determination (R2), and the Developed Discrepancy Ratio (DDR) metrics were utilized to MLMs' performance assessment. The performance evaluation indices (RMSE, MAEP, R2, DDR) for the preeminent MLNN model applied to Bulakhbashi and Karasu stations were determined as (0.29, 1.57, 0.9998, 17.62) and (1.71, 6.56, 0.9980, 6.65), respectively. The MLNN model contributed to a notable enhancement in the RMSE performance index for the aforementioned stations, exhibiting improvements of 87% and 56%, respectively. These results affirm the MLNN's proficiency in accurately capturing the stage-discharge at both monitoring stations.

Nina Krüger, Christoph Külls, Adriana Bruggeman, Christos Christofi (2024) Groundwater recharge estimation in Mediterranean mountain environments by isotope profiles – Partitioning of macropore and matrix flow. Journal of Hydrology pp. 131352. doi web bibtex

@article{KRUGER2024131352,
title = {Groundwater recharge estimation in Mediterranean mountain environments by isotope profiles – Partitioning of macropore and matrix flow},
journal = {Journal of Hydrology},
pages = {131352},
year = {2024},
issn = {0022-1694},
doi = {https://doi.org/10.1016/j.jhydrol.2024.131352},
url = {https://www.sciencedirect.com/science/article/pii/S0022169424007479},
author = {Nina Krüger and Christoph Külls and Adriana Bruggeman and Christos Christofi},
keywords = {Groundwater recharge, Isotope hydrology, Mediterranean, Tracer studies},
abstract = {Developing and continuously improving effective and feasible methods to estimate groundwater recharge is essential to ensure sustainable resource assessment. Mountain environments represent key areas for the regional water balance. In this study, the isotope profile method was used to investigate water fluxes through the vadose zone and subsequent groundwater recharge in a Mediterranean mountain environment. Six high-resolution soil water isotope profiles were taken at two different locations in the Troodos Massif (Cyprus) in the eastern Mediterranean, focusing on estimating recharge in the soil of hillslopes. Analysis of the isotope profiles yielded recharge rates ranging from 30–70 mm/year, leading to a re-evaluation of previous studies on groundwater recharge. The comparison of results obtained by the peak-shift method and mathematical modeling was used to partition matrix and macropore flow, reaching up to 39 %. Potential methodological limits of the environmental isotope profile method in skeleton-rich soils were found.}
}

Abstract Developing and continuously improving effective and feasible methods to estimate groundwater recharge is essential to ensure sustainable resource assessment. Mountain environments represent key areas for the regional water balance. In this study, the isotope profile method was used to investigate water fluxes through the vadose zone and subsequent groundwater recharge in a Mediterranean mountain environment. Six high-resolution soil water isotope profiles were taken at two different locations in the Troodos Massif (Cyprus) in the eastern Mediterranean, focusing on estimating recharge in the soil of hillslopes. Analysis of the isotope profiles yielded recharge rates ranging from 30–70 mm/year, leading to a re-evaluation of previous studies on groundwater recharge. The comparison of results obtained by the peak-shift method and mathematical modeling was used to partition matrix and macropore flow, reaching up to 39 %. Potential methodological limits of the environmental isotope profile method in skeleton-rich soils were found.

Ibukun Ola, Carsten Drebenstedt, Robert M. Burgess, Martin Mensah, Nils Hoth, Christoph Külls (2024) Remediating Oil Contamination in the Niger Delta Region of Nigeria: Technical Options and Monitoring Strategies. The Extractive Industries and Society 17 pp. 101405. doi web bibtex

@article{OLA2024101405,
title = {Remediating Oil Contamination in the Niger Delta Region of Nigeria: Technical Options and Monitoring Strategies},
journal = {The Extractive Industries and Society},
volume = {17},
pages = {101405},
year = {2024},
issn = {2214-790X},
doi = {https://doi.org/10.1016/j.exis.2024.101405},
url = {https://www.sciencedirect.com/science/article/pii/S2214790X24000030},
author = {Ibukun Ola and Carsten Drebenstedt and Robert M. Burgess and Martin Mensah and Nils Hoth and Christoph Külls},
keywords = {Nigeria, Niger Delta, Ogoni, Oil remediation, Organoclay capping, Permeable reactive barriers, bioremediation},
abstract = {The Niger Delta, a region of immense ecological significance and rich biodiversity, has long faced the severe consequences of petroleum contamination resulting from intense oil exploration and various environmental stressors. In response to the pressing need for effective remediation and monitoring of contaminated matrices in the Niger Delta, this study delves into a comprehensive analysis. Through a systematic assessment considering certain criteria, advanced remediation technologies tailored to the specific environmental challenges in the region are identified. Organoclay-based reactive core materials (RCM), permeable reactive barriers (PRBs), and bioremediation have emerged as highly suitable solutions for remediating sediment, groundwater, and soil, respectively. These technologies span the spectrum from non-intrusive to less intrusive methods and have demonstrated exceptional efficacy in mitigating hydrocarbon contamination under the delta's prevailing complex conditions. In addressing the critical need for monitoring the progress of remediation and post-remediation stages, a fully integrated approach is proposed. This strategy combines three essential components for tracking environmental quality improvements and understanding the recovery processes: traditional total chemical concentration (Ctotal) estimates, passive sampler-derived freely dissolved chemical concentration (Cfree) measurements, and ecological monitoring, specifically the recolonization test. Together, these components provide a more accurate description of risk and a comprehensive understanding of the recovery process. This study is concentrated on the systematic selection, supported by credible case study information, of tailored technical solutions for addressing the unique challenges of the Niger Delta. The novel outcomes lie in the identification of technology solutions carefully adapted for the region, representing a significant advancement in the field of environmental remediation in the Niger Delta. Science-based remediation and monitoring are key, and this study offers a decision support tool for selecting optimal methods in the ongoing cleanup of the Niger Delta and similar areas. This supports a healthier, more resilient environment for both the region's inhabitants and ecosystems.}
}

Abstract The Niger Delta, a region of immense ecological significance and rich biodiversity, has long faced the severe consequences of petroleum contamination resulting from intense oil exploration and various environmental stressors. In response to the pressing need for effective remediation and monitoring of contaminated matrices in the Niger Delta, this study delves into a comprehensive analysis. Through a systematic assessment considering certain criteria, advanced remediation technologies tailored to the specific environmental challenges in the region are identified. Organoclay-based reactive core materials (RCM), permeable reactive barriers (PRBs), and bioremediation have emerged as highly suitable solutions for remediating sediment, groundwater, and soil, respectively. These technologies span the spectrum from non-intrusive to less intrusive methods and have demonstrated exceptional efficacy in mitigating hydrocarbon contamination under the delta's prevailing complex conditions. In addressing the critical need for monitoring the progress of remediation and post-remediation stages, a fully integrated approach is proposed. This strategy combines three essential components for tracking environmental quality improvements and understanding the recovery processes: traditional total chemical concentration (Ctotal) estimates, passive sampler-derived freely dissolved chemical concentration (Cfree) measurements, and ecological monitoring, specifically the recolonization test. Together, these components provide a more accurate description of risk and a comprehensive understanding of the recovery process. This study is concentrated on the systematic selection, supported by credible case study information, of tailored technical solutions for addressing the unique challenges of the Niger Delta. The novel outcomes lie in the identification of technology solutions carefully adapted for the region, representing a significant advancement in the field of environmental remediation in the Niger Delta. Science-based remediation and monitoring are key, and this study offers a decision support tool for selecting optimal methods in the ongoing cleanup of the Niger Delta and similar areas. This supports a healthier, more resilient environment for both the region's inhabitants and ecosystems.

2022 (1)

M. Eliades, A. Bruggeman, H. Djuma, C. Christofi, C. Kuells (2022) Quantifying Evapotranspiration and Drainage Losses in a Semi-Arid Nectarine (Prunus persica var. nucipersica) Field with a Dynamic Crop Coefficient (Kc) Derived from Leaf Area Index Measurements. Water 14 (5) doi bibtex

@article{Eliades2022,
title = {Quantifying Evapotranspiration and Drainage Losses in a Semi-Arid Nectarine (Prunus persica var. nucipersica) Field with a Dynamic Crop Coefficient (Kc) Derived from Leaf Area Index Measurements},
ISSN = {2073-4441}, 
DOI = {10.3390/w14050734}, 
volume = {14}, 
number = {5}, 
year = {2022}, 
journal = {Water}, 
author = {Eliades, M. and Bruggeman, A. and Djuma, H. and Christofi, C. and Kuells, C.}, 
abstract = {Quantifying evapotranspiration and drainage losses is essential for improving irrigation efficiency. The FAO-56 is the most popular method for computing crop evapotranspiration. There is, however, a need for locally derived crop coefficients (Kc) with a high temporal resolution to reduce errors in the water balance. The aim of this paper is to introduce a dynamic Kc approach, based on Leaf Area Index (LAI) observations, for improving water balance computations. Soil moisture and meteorological data were collected in a terraced nectarine (Prunus persica var. nucipersica) orchard in Cyprus, from 22 March 2019 to 18 November 2021. The Kc was derived as a function of the canopy cover fraction (c), from biweekly in situ LAI measurements. The use of a dynamic Kc resulted in Kc estimates with a bias of 17 mm and a mean absolute error of 0.8 mm. Evapotranspiration (ET) ranged from 41% of the rainfall (P) and irrigation (I) in the wet year (2019) to 57% of P + I in the dry year (2021). Drainage losses from irrigation (DR_I) were 44% of the total irrigation. The irrigation efficiency in the nectarine field could be improved by reducing irrigation amounts and increasing the irrigation frequency. Future studies should focus on improving the dynamic Kc approach by linking LAI field observations with remote sensing observations and by adding ground cover observations.}
}

Abstract Quantifying evapotranspiration and drainage losses is essential for improving irrigation efficiency. The FAO-56 is the most popular method for computing crop evapotranspiration. There is, however, a need for locally derived crop coefficients (Kc) with a high temporal resolution to reduce errors in the water balance. The aim of this paper is to introduce a dynamic Kc approach, based on Leaf Area Index (LAI) observations, for improving water balance computations. Soil moisture and meteorological data were collected in a terraced nectarine (Prunus persica var. nucipersica) orchard in Cyprus, from 22 March 2019 to 18 November 2021. The Kc was derived as a function of the canopy cover fraction ©, from biweekly in situ LAI measurements. The use of a dynamic Kc resulted in Kc estimates with a bias of 17 mm and a mean absolute error of 0.8 mm. Evapotranspiration (ET) ranged from 41% of the rainfall (P) and irrigation (I) in the wet year (2019) to 57% of P + I in the dry year (2021). Drainage losses from irrigation (DR_I) were 44% of the total irrigation. The irrigation efficiency in the nectarine field could be improved by reducing irrigation amounts and increasing the irrigation frequency. Future studies should focus on improving the dynamic Kc approach by linking LAI field observations with remote sensing observations and by adding ground cover observations.

2020 (6)

Christos Christofi, Adriana Bruggeman, Christoph Kuells, Costas Constantinou (2020) Hydrochemical evolution of groundwater in gabbro of the Troodos Fractured Aquifer. A comprehensive approach. Applied Geochemistry 114 pp. 104524. Pergamon. bibtex

@article{christofi2020hydrochemical, 
title={Hydrochemical evolution of groundwater in gabbro of the Troodos Fractured Aquifer. A comprehensive approach}, 
author={Christofi, Christos and Bruggeman, Adriana and Kuells, Christoph and Constantinou, Costas}, 
journal={Applied Geochemistry}, 
volume={114}, 
pages={104524}, 
year={2020}, 
publisher={Pergamon}
}

Charalampos Doulgeris, Evangelos Tziritis, Vassilios Pisinaras, Andreas Panagopoulos, Christoph Külls (2020) Prediction of seawater intrusion to coastal aquifers based on non-dimensional diagrams. In EGU General Assembly Conference Abstracts. pp. 4073. bibtex

@inproceedings{doulgeris2020prediction,
title={Prediction of seawater intrusion to coastal aquifers based on non-dimensional diagrams},
author={Doulgeris, Charalampos and Tziritis, Evangelos and Pisinaras, Vassilios and Panagopoulos, Andreas and K\"ulls, Christoph},
booktitle={EGU General Assembly Conference Abstracts},
pages={4073},
year={2020}
}

Zehao Jin, Christoph Külls (2020) FDM based OA-ICOS for high accuracy 13C quantification in gaseous CO2. E&ES 446 (3) pp. 032061. bibtex

@article{jin2020fdm,
title={FDM based OA-ICOS for high accuracy 13C quantification in gaseous CO2},
author={Jin, Zehao and K\"ulls, Christoph},
journal={E\&ES},
volume={446},
number={3},
pages={032061},
year={2020}
}

Nina Krüger, Christoph Külls, Adriana Bruggeman, Marinos Eliades, Christos Christophi, Michali Rigas, Theodosia Eracleous (2020) Groundwater recharge estimates with soil isotope profiles-is there a bias on coarse-grained hillslopes?. In EGU General Assembly Conference Abstracts. pp. 9840. bibtex

@inproceedings{kruger2020groundwater,
title={Groundwater recharge estimates with soil isotope profiles-is there a bias on coarse-grained hillslopes?},
author={Kr\"uger, Nina and K\"ulls, Christoph and Bruggeman, Adriana and Eliades, Marinos and Christophi, Christos and Rigas, Michali and Eracleous, Theodosia},
booktitle={EGU General Assembly Conference Abstracts},
pages={9840},
year={2020}
}

Amani Mahindawansha, Christoph Külls, Philipp Kraft, Lutz Breuer (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) pp. 3627–3642. Copernicus GmbH. bibtex

@article{mahindawansha2020investigating, 
title={Investigating unproductive water losses from irrigated agricultural crops in the humid tropics through analyses of stable isotopes of water}, 
author={Mahindawansha, Amani and K\"ulls, Christoph and Kraft, Philipp and Breuer, Lutz}, 
journal={Hydrology and Earth System Sciences}, 
volume={24}, 
number={7}, 
pages={3627--3642}, 
year={2020}, 
publisher={Copernicus GmbH}
}

Evangelos Tziritis, Vassilis Aschonitis, Gabriella Balacco, Petros Daras, Charalampos Doulgeris, Maria Dolores Fidelibus, Elyes Gaubi, Moncef Gueddari, Cüneyt Güler, Fadoua Hamzaoui, others (2020) MEDSAL Project-Salinization of critical groundwater reserves in coastal Mediterranean areas: Identification, risk assessment and sustainable management with the use of integrated modelling and smart ICT tools. In EGU General Assembly Conference Abstracts. pp. 2326. bibtex

@inproceedings{tziritis2020medsal,
title={MEDSAL Project-Salinization of critical groundwater reserves in coastal Mediterranean areas: Identification, risk assessment and sustainable management with the use of integrated modelling and smart ICT tools},
author={Tziritis, Evangelos and Aschonitis, Vassilis and Balacco, Gabriella and Daras, Petros and Doulgeris, Charalampos and Fidelibus, Maria Dolores and Gaubi, Elyes and Gueddari, Moncef and G\"uler, C\"uneyt and Hamzaoui, Fadoua and others},
booktitle={EGU General Assembly Conference Abstracts},
pages={2326},
year={2020}
}

2019 (1)

Joseph Jobin, Christoph Külls, Matthias Arend, Marcus Schaub, Frank Hagedorn, Arthur Gessler, Markus Weiler (2019) Application of a laser-based spectrometer for continuous in situ measurements of stable isotopes of soil CO 2 in calcareous and acidic soils. Soil 5 (1) pp. 49–62. Copernicus GmbH. bibtex

@article{jobin2019application,
title={Application of a laser-based spectrometer for continuous in situ measurements of stable isotopes of soil CO 2 in calcareous and acidic soils},
author={Jobin, Joseph and K\"ulls, Christoph and Arend, Matthias and Schaub, Marcus and Hagedorn, Frank and Gessler, Arthur and Weiler, Markus},
journal={Soil},
volume={5},
number={1},
pages={49--62},
year={2019},
publisher={Copernicus GmbH}
}

2018 (2)

Anna Androvitsanea, Mohammad Fawzy, Johanna Fuchs, Christoph Jan Kuells, Henning Fahlbusch, Joachim Heiden (2018) Hydrologische Bedingungen im Heraion von Samos vom 12. bis 8. Jh. v. Chr. und ihre Bedeutung für die wasserbauliche Infrastruktur. Environmental Water Engineering 1 (1) pp. 1–21. bibtex

@article{androvitsanea2018hydrologische,
title={Hydrologische Bedingungen im Heraion von Samos vom 12. bis 8. Jh. v. Chr. und ihre Bedeutung f\"ur die wasserbauliche Infrastruktur},
author={Androvitsanea, Anna and Fawzy, Mohammad and Fuchs, Johanna and Kuells, Christoph Jan and Fahlbusch, Henning and Heiden, Joachim},
journal={Environmental Water Engineering},
volume={1},
number={1},
pages={1--21},
year={2018}
}

Gunther Ardelt, Christoph Külls, Horst Hellbrück (2018) Towards intrinsic molecular communication using isotopic isomerism. Open Journal of Internet Of Things (OJIOT) 4 (1) pp. 135–143. RonPub. bibtex

@article{ardelt2018towards,
title={Towards intrinsic molecular communication using isotopic isomerism},
author={Ardelt, Gunther and K\"ulls, Christoph and Hellbr\"uck, Horst},
journal={Open Journal of Internet Of Things (OJIOT)},
volume={4},
number={1},
pages={135--143},
year={2018},
publisher={RonPub}
}

2014 (4)

M. Gaj, M. Beyer, J. Hamutoko, S. Uugulu, H. Wanke, P. Koeniger, C. Külls, C. Lohe, T. Himmelsbach (2014) How do soil types affect stable isotope ratios of 2H and 18O under evaporation: A Fingerprint of the Niipele subbasin of the Cuvelai-Etosha basin, Namibia. In EGU General Assembly Conference Abstracts. pp. 5890. bibtex

@InProceedings{Gaj_etal2014,
author="Gaj, M.
and Beyer, M.
and Hamutoko, J.
and Uugulu, S.
and Wanke, H.
and Koeniger, P.
and K\"ulls, C.
and Lohe, C.
and Himmelsbach, T.",
title="How do soil types affect stable isotope ratios of 2H and 18O under evaporation: A Fingerprint of the Niipele subbasin of the Cuvelai-Etosha basin, Namibia",
booktitle="EGU General Assembly Conference Abstracts",
year="2014",
volume="16",
pages="5890",
optnote="exported from refbase (http://uhydro.de/base/show.php?record=1236), last updated on Fri, 10 Apr 2015 12:35:09 +0200"
}

JT Hamutoko, BS Mapani, R Ellmies, A Bittner, C Kuells (2014) A fingerprinting method for the identification of uranium sources in alluvial aquifers: An example from the Khan and Swakop Rivers, Namibia. Physics and Chemistry of the Earth, Parts A/B/C 72 pp. 34–42. Pergamon. bibtex

@article{hamutoko2014fingerprinting,
title={A fingerprinting method for the identification of uranium sources in alluvial aquifers: An example from the Khan and Swakop Rivers, Namibia},
author={Hamutoko, JT and Mapani, BS and Ellmies, R and Bittner, A and Kuells, C},
journal={Physics and Chemistry of the Earth, Parts A/B/C},
volume={72},
pages={34--42},
year={2014},
publisher={Pergamon}
}

C. Külls, A. Nunes, M. Kölbel-Batista, C. Branquinho, N. Bianconi, E. Costantini (2014) Integrated use of soil physical and water isotope methods for ecohydrological characterization of desertified areas. In EGU General Assembly Conference Abstracts. pp. 15430. bibtex

@InProceedings{Kuells_etal2014,
author="K\"ulls, C.
and Nunes, A.
and K\"olbel-Batista, M.
and Branquinho, C.
and Bianconi, N.
and Costantini, E.",
title="Integrated use of soil physical and water isotope methods for ecohydrological characterization of desertified areas",
booktitle="EGU General Assembly Conference Abstracts",
year="2014",
volume="16",
pages="15430",
optnote="exported from refbase (http://uhydro.de/base/show.php?record=1235), last updated on Fri, 10 Apr 2015 12:38:28 +0200"
}

M.H. Mueller, A. Alaoui, C. Külls, H. Leistert, K. Meusburger, C. Stumpp, M. Weiler, C. Alewell (2014) Tracking water pathways in steep hillslopes by $ delta$ 18 O depth profiles of soil water. Journal of Hydrology 519 pp. 340–352. Elsevier. bibtex

@Article{Mueller_etal2014,
author="Mueller, M.H.
and Alaoui, A.
and K\"ulls, C.
and Leistert, H.
and Meusburger, K.
and Stumpp, C.
and Weiler, M.
and Alewell, C.",
title="Tracking water pathways in steep hillslopes by $\delta$ 18 O depth profiles of soil water",
journal="Journal of Hydrology",
year="2014",
publisher="Elsevier",
volume="519",
pages="340--352",
optnote="exported from refbase (http://uhydro.de/base/show.php?record=1234), last updated on Fri, 10 Apr 2015 12:35:09 +0200"
}

2013 (3)

S. Baram, Z. Ronen, D. Kurtzman, C. Külls, O. Dahan (2013) Desiccation-crack-induced salinization in deep clay sediment. Hydrology and Earth System Sciences 17 (4) pp. 1533–1545. Copernicus GmbH. bibtex

@Article{Baram_etal2013,
author="Baram, S.
and Ronen, Z.
and Kurtzman, D.
and K\"ulls, C.
and Dahan, O.",
title="Desiccation-crack-induced salinization in deep clay sediment",
journal="Hydrology and Earth System Sciences",
year="2013",
publisher="Copernicus GmbH",
volume="17",
number="4",
pages="1533--1545",
optnote="exported from refbase (http://uhydro.de/base/show.php?record=1230), last updated on Fri, 10 Apr 2015 12:35:54 +0200"
}

P.F. Davila, C. Külls, M. Weiler (2013) A toolkit for groundwater mean residence time interpretation with gaseous tracers. Computers & Geosciences 61 pp. 116–125. Pergamon. bibtex

@Article{Davila_etal2013,
author="Davila, P.F.
and K\"ulls, C.
and Weiler, M.",
title="A toolkit for groundwater mean residence time interpretation with gaseous tracers",
journal="Computers \& Geosciences",
year="2013",
publisher="Pergamon",
volume="61",
pages="116--125",
optnote="exported from refbase (http://uhydro.de/base/show.php?record=1232), last updated on Fri, 10 Apr 2015 12:36:49 +0200"
}

J. Klaus, E. Zehe, M. Elsner, C. Külls, J.J. McDonnell (2013) Macropore flow of old water revisited: experimental insights from a tile-drained hillslope. Hydrology and Earth System Sciences 17 (1) pp. 103–118. Copernicus GmbH. bibtex

@Article{Klaus_etal2013,
author="Klaus, J.
and Zehe, E.
and Elsner, M.
and K\"ulls, C.
and McDonnell, J.J.",
title="Macropore flow of old water revisited: experimental insights from a tile-drained hillslope",
journal="Hydrology and Earth System Sciences",
year="2013",
publisher="Copernicus GmbH",
volume="17",
number="1",
pages="103--118",
optnote="exported from refbase (http://uhydro.de/base/show.php?record=1228), last updated on Fri, 10 Apr 2015 12:39:05 +0200"
}

2012 (3)

J. Garvelmann, C. Külls, M. Weiler (2012) A porewater-based stable isotope approach for the investigation of subsurface hydrological processes. Hydrology and Earth System Sciences 16 (2) pp. 631–640. Copernicus GmbH. bibtex

@Article{Garvelmann_etal2012,
author="Garvelmann, J.
and K\"ulls, C.
and Weiler, M.",
title="A porewater-based stable isotope approach for the investigation of subsurface hydrological processes",
journal="Hydrology and Earth System Sciences",
year="2012",
publisher="Copernicus GmbH",
volume="16",
number="2",
pages="631--640",
optnote="exported from refbase (http://uhydro.de/base/show.php?record=1216), last updated on Fri, 10 Apr 2015 12:37:18 +0200"
}

J. Klaus, E. Zehe, M. Elsner, C. Külls, J.J. McDonnell (2012) Macropore flow of old water revisited: where does the mixing occur at the hillslope scale?. Hydrology and Earth System Sciences Discussions 9 (4) pp. 4333–4380. Copernicus GmbH. bibtex

@Article{Klaus_etal2012,
author="Klaus, J.
and Zehe, E.
and Elsner, M.
and K\"ulls, C.
and McDonnell, J.J.",
title="Macropore flow of old water revisited: where does the mixing occur at the hillslope scale?",
journal="Hydrology and Earth System Sciences Discussions",
year="2012",
publisher="Copernicus GmbH",
volume="9",
number="4",
pages="4333--4380",
optnote="exported from refbase (http://uhydro.de/base/show.php?record=1205), last updated on Fri, 10 Apr 2015 12:39:17 +0200"
}

C. Külls (2012) Rekonstruktion hydrologischer Extreme in der Namibwüste. pp. 69–82. Freiburg. bibtex

@Article{Kuells2012,
author="K\"ulls, C.",
title="Rekonstruktion hydrologischer Extreme in der Namibw{\"u}ste",
year="2012",
address="Freiburg",
volume="101",
pages="69--82",
optkeywords="Namib",
optkeywords="Grundwasser",
optkeywords="Isotope",
optkeywords="Altersdatierung",
optnote="exported from refbase (http://uhydro.de/base/show.php?record=952), last updated on Mon, 13 Feb 2012 20:17:34 +0100",
language="dt."
}

2011 (2)

S. Frey, C. K„u lls, C. Schlosser (2011) New Hydrological Age-Dating Techniques using Cosmogenic Radionuclides Beryllium-7 and Sodium-22. bibtex

@Article{Frey_etal2011,
author="Frey, S.
and K"u\lls, C.
and Schlosser, C.",
title="New Hydrological Age-Dating Techniques using Cosmogenic Radionuclides Beryllium-7 and Sodium-22",
year="2011",
optnote="exported from refbase (http://uhydro.de/base/show.php?record=1233), last updated on Fri, 10 Apr 2015 12:35:09 +0200"
}

J. Garvelmann, C. Külls, M. Weiler (2011) A porewater – based stable isotope approach for the investigation of subsurface hydrological processes (discussion paper). Hydrology and Earth System Sciences Discussions 8 (5) pp. 9089–9112. doi bibtex

@Article{Garvelmann_etal2011,
author="Garvelmann, J.
and K\"ulls, C.
and Weiler, M.",
title="A porewater -- based stable isotope approach for the investigation of subsurface hydrological processes (discussion paper)",
journal="Hydrology and Earth System Sciences Discussions",
year="2011",
volume="8",
number="5",
pages="9089--9112",
optnote="exported from refbase (http://uhydro.de/base/show.php?record=955), last updated on Wed, 29 Aug 2012 18:58:15 +0200",
issn="1812-2116",
doi="10.5194/hessd-8-9089-2011"
}

2010 (1)

G. Benito, R. Rohde, M. Seely, C. Külls, O. Dahan, Y. Enzel (2010) Management of Alluvial Aquifers in Two Southern African Ephemeral Rivers: Implications for IWRM. Water Resources Management 24 (4) pp. 641–667. doi web bibtex

@article{Benito.51,
author = {Benito, G. and Rohde, R. and Seely, M. and K\"ulls, C. and Dahan, O. and Enzel, Y.},
title = {Management of Alluvial Aquifers in Two Southern African Ephemeral Rivers: Implications for IWRM},
URL = {http://www.springerlink.com/index/A444075625259522.pdf},
ISSN = {0920-4741 (Print) 1573-1650 (Online)},
DOI = {10.1007/s11269-009-9463-9},
volume = {24},
number = {4},
year = {2010},
journal = {Water Resources Management},
pages = {641--667}
}

2009 (3)

C. Külls, J. Zabori (2009) On the representation of hydrological processes in current SVAT schemes-comparison and perspective (Invited). AGU Fall Meeting Abstracts web bibtex

@article{Kulls.43,
author = {K\"ulls, C. and Zabori, J.},
title = {On the representation of hydrological processes in current SVAT schemes-comparison and perspective (Invited)},
URL = {http://adsabs.harvard.edu/abs/2009AGUFM.B14A..01K},
year = {2009},
journal = {AGU Fall Meeting Abstracts}
}

C. Leibundgut, P. Maloszewski, C. Külls (2009) Tracers in hydrology. John Wiley & Sons. web bibtex

@book{Leibundgut.29,
author = {Leibundgut, C. and Maloszewski, P. and K\"ulls, C.},
title = {Tracers in hydrology},
URL = {http://eu.wiley.com/WileyCDA/WileyTitle/productCd-0470518855.html},
ISBN = {978-0470518854},
edition = {1st},
year = {2009},
publisher = {John Wiley \& Sons}
}

E. Morin, T. Grodek, Y. Enzel, O. Dahan, G. Benito, C. Külls, Y. Jacoby, G. van Langenhove, M. Seely (2009) Flood routing and alluvial aquifer recharge along the ephemeral arid Kuiseb River, Namibia. J. Hydrol. 368 pp. 262–275. web bibtex

@article{Morin.18,
author = {Morin, E. and Grodek, T. and Enzel, Y. and Dahan, O. and Benito, G. and K\"ulls, C. and Jacoby, Y. and van Langenhove, G. and Seely, M.},
title = {Flood routing and alluvial aquifer recharge along the ephemeral arid Kuiseb River, Namibia},
URL = {http://linkinghub.elsevier.com/retrieve/pii/S0022169409000882},
volume = {368},
year = {2009},
journal = {J. Hydrol.},
pages = {262--275}
}

2008 (5)

O. Dahan, B. Tatarsky, Y. Enzel, C. Külls, M. Seely, G. Benito (2008) Dynamics of flood water infiltration and ground water recharge in hyperarid desert. Ground Water 46 (3) pp. 450–461. doi web bibtex

@article{Dahan.11,
author = {Dahan, O. and Tatarsky, B. and Enzel, Y. and K\"ulls, C. and Seely, M. and Benito, G.},
title = {Dynamics of flood water infiltration and ground water recharge in hyperarid desert},
URL = {http://www3.interscience.wiley.com/journal/119390554/abstract},
DOI = {10.1111/j.1745-6584.2007.00414.x},
volume = {46},
number = {3},
year = {2008},
journal = {Ground Water},
pages = {450--461}
}

I. Heidbuechl, C. Külls (2008) Groundwater controls on flash flood shape and incidence. Geophysical Research Abstracts web bibtex

@article{Heidbuechl.50,
author = {Heidbuechl, I. and K\"ulls, C.},
title = {Groundwater controls on flash flood shape and incidence},
URL = {http://www.cosis.net/abstracts/EGU2008/11123/EGU2008-A-11123-2.pdf?PHPSESSID=d1b7d1803114b6424729e5e35ffc4f7f},
year = {2008},
journal = {Geophysical Research Abstracts}
}

C. Külls (2008) The WADE experience-twinning hydrological research and IWRM in European and Southern African drylands. bibtex

@misc{Kulls.44,
author = {K\"ulls, C.},
title = {The WADE experience-twinning hydrological research and IWRM in European and Southern African drylands},
year = {2008}
}

C. Külls (2008) Significant trends, underlying processes and indicators-the validation of hydrological change. bibtex

@misc{Kulls.45,
author = {K\"ulls, C.},
title = {Significant trends, underlying processes and indicators-the validation of hydrological change},
year = {2008},
}

J. Klaus, C. Külls, O. Dahan (2008) Evaluating the recharge mechanism of the Lower Kuiseb Dune area using mixing cell modeling and residence time data. J. Hydrol. 358 (3-4) pp. 304–316. doi web bibtex

@article{Klaus.20,
author = {Klaus, J. and K\"ulls, C. and Dahan, O.},
title = {Evaluating the recharge mechanism of the Lower Kuiseb Dune area using mixing cell modeling and residence time data},
URL = {http://linkinghub.elsevier.com/retrieve/pii/S002216940800293X},
DOI = {10.1016/j.jhydrol.2008.06.012},
volume = {358},
number = {3-4},
year = {2008},
journal = {J. Hydrol.},
pages = {304--316}
}

2007 (5)

O. Dahan, Y. Shani, Y. Enzel, Y. Yechieli, A. Yakirevich (2007) Direct measurements of floodwater infiltration into shallow alluvial aquifers. Journal of Hydrology 344 pp. 157–170. bibtex

@article{Dahan.59,
author = {Dahan, O. and Shani, Y. and Enzel, Y. and Yechieli, Y. and Yakirevich, A.},
title = {Direct measurements of floodwater infiltration into shallow alluvial aquifers},
volume = {344},
year = {2007},
journal = {Journal of Hydrology},
pages = {157--170}
}

C. Külls (2007) Large basins as isotopic monitors of hydrologic response in arid zones. Geophysical Research Abstracts bibtex

@article{Kulls.36,
author = {K\"ulls, C.},
title = {Large basins as isotopic monitors of hydrologic response in arid zones},
year = {2007},
journal = {Geophysical Research Abstracts}
}

C. Külls (2007) Interaction between riparian phreatophytes, alluvial aquifers and channel processes. Geophysical Research Abstracts bibtex

@article{Kulls.49,
author = {K\"ulls, C.},
title = {Interaction between riparian phreatophytes, alluvial aquifers and channel processes},
year = {2007},
journal = {Geophysical Research Abstracts}
}

E. Zagana, M. Obeidat, C. Külls, P. Udluft (2007) Chloride, hydrochemical and isotope methods of groundwater recharge estimation in eastern Mediterranean areas: a case study in Jordan. Hydrol. Proc. 21 (16) pp. 2112–2123. doi web bibtex

@article{Zagana.17,
author = {Zagana, E. and Obeidat, M. and K\"ulls, C. and Udluft, P.},
title = {Chloride, hydrochemical and isotope methods of groundwater recharge estimation in eastern Mediterranean areas: a case study in Jordan},
URL = {http://www3.interscience.wiley.com/journal/114202153/abstract},
DOI = {10.1002/hyp.6390},
volume = {21},
number = {16},
year = {2007},
journal = {Hydrol. Proc.},
pages = {2112--2123}
}

E. Zagana, C. Külls, P. Udluft, C. Constantinou (2007) Methods of groundwater recharge estimation in Eastern Mediterranean - a water balance model application in Greece, Cyprus and Jordan. Hydrol. Proc. 21 (18) pp. 2405–2414. doi web bibtex

@article{Zagana.21,
author = {Zagana, E. and K\"ulls, C. and Udluft, P. and Constantinou, C.},
title = {Methods of groundwater recharge estimation in Eastern Mediterranean - a water balance model application in Greece, Cyprus and Jordan},
URL = {http://www3.interscience.wiley.com/journal/114202156/abstract},
ISSN = {1099-1085},
DOI = {10.1002/hyp.6392},
volume = {21},
number = {18},
year = {2007},
journal = {Hydrol. Proc.},
pages = {2405--2414}
}

2006 (1)

C. Külls (2006) Indicators for the the distribution of flood recharge along ephemeral rivers. Geophysical Research Abstracts bibtex

@article{Kulls.38,
author = {K\"ulls, C.},
title = {Indicators for the the distribution of flood recharge along ephemeral rivers},
year = {2006},
journal = {Geophysical Research Abstracts}
}

2004 (1)

U. Tröger, C. L. Dias, J. R. Guillaumon, M. A. Iritani, C. Külls, G. Schuler (2004) Remarks and new data about the recharge of the Guarani Aquifer System. In XXXIIICongressAIH. pp. T5-39. IAH. Mexico City. web bibtex

@inproceedings{Troger.54,
author = {Tr\"oger, U. and Dias, C. L. and Guillaumon, J. R. and Iritani, M. A. and K\"ulls, C. and Schuler, G.},
title = {Remarks and new data about the recharge of the Guarani Aquifer System},
publisher = {IAH},
URL = {http://www.igeograf.unam.mx/aih/pdf/T5/T5-39.pdf},
series = {IAH Conf. Proceedings},
year = {2004},
publisher = {IAH},
address = {Mexico City},
booktitle = XXXIIICongressAIH,
pages = {T5-39}
}

2003 (2)

T. Gaiser, M. Krol, H. Frischkorn, J. C. Araujo (2003) Global Change and Regional Impacts. Springer. Berlin, Heidelberg, New York. bibtex

@book{Gaiser.52,
author = {Gaiser, T. and Krol, M. and Frischkorn, H. and Araujo, J. C.},
title = {Global Change and Regional Impacts},
edition = {1},
year = {2003},
publisher = {Springer},
address = {Berlin, Heidelberg, New York},
keywords = {Brazil,IWRM}
}

S. Voerkelius, C. Külls, M. Santiago, H. Frischkorn, L. Alves dos Santos Semrau, G. Heinrichs, M. M. Lopez Gil (2003) Investigations on Water Management and Water Quality in Picos/PI and Taua/CE. In Investigations on Water Management and Water Quality in Picos/PI and Taua/CE. pp. 173–184. Springer. Berlin, Heidelberg, New York. bibtex

@incollection{Voerkelius.22,
author = {Voerkelius, S. and K\"ulls, C. and Santiago, M. and Frischkorn, H. and Alves dos Santos Semrau, L. and Heinrichs, G. and Lopez Gil, M. M.},
title = {Investigations on Water Management and Water Quality in Picos/PI and Taua/CE},
ISBN = {3540438246},
year = {2003},
publisher = {Springer},
address = {Berlin, Heidelberg, New York},
booktitle = {Investigations on Water Management and Water Quality in Picos/PI and Taua/CE},
pages = {173--184}
}

2002 (1)

E. Adar, C. Külls (2002) MCMsf - Mixing-cell model for a steady flow MIG: Mixing-cell input generator. A short manual for installation and operation of MCMsf using the MIG mixing-cell input generator. In Use of Isotopes for Analyses of Flow and Transport Dynamics in Groundwater Systems. pp. 1–29. IAEA. Vienna. web bibtex

@incollection{Adar.46,
author = {Adar, E. and K\"ulls, C.},
title = {MCMsf - Mixing-cell model for a steady flow MIG: Mixing-cell input generator. A short manual for installation and operation of MCMsf using the MIG mixing-cell input generator},
URL = {http://www-naweb.iaea.org/napc/ih/documents/TECDOCS/TECDOC{\%}20Flow{\%}20and{\%}20transport{\%}20in{\%}20groundwater{\%}202002{\%}20UIAGS.PDF},
series = {IAEA-TECDOC},
number = {1448},
year = {2002},
publisher = {IAEA},
address = {Vienna},
booktitle = {{Use of Isotopes for Analyses of Flow and Transport Dynamics in Groundwater Systems}},
pages = {1--29},
keywords = {groundwater,mixing,modeling}
}

2001 (2)

C. Külls (2001) Groundwater of the North-Western Kalahari, Namibia. Estimation of Recharge and Quantification of the Flow Systems. Hydrogeologie und Umwelt 28 pp. 1–165. web bibtex

@article{Kulls.30,
author = {K\"ulls, C.},
title = {Groundwater of the North-Western Kalahari, Namibia. Estimation of Recharge and Quantification of the Flow Systems},
URL = {http://nbn-resolving.de/urn:nbn:de:bvb:20-1180680},
ISSN = {09309-3757},
volume = {28},
year = {2001},
journal = {Hydrogeologie und Umwelt},
pages = {1--165}
}

H. Klock, C. Külls, P. Udluft (2001) Estimating recharge values using hydrochemical and geological data: A case study from the semiarid Kalahari. In Impact of human activity on groundwater dynamics. pp. 25–31. IAHS Red Book Series. Wallingford U.K.. web bibtex

@incollection{Klock.34,
author = {Klock, H. and K\"ulls, C. and Udluft, P.},
title = {Estimating recharge values using hydrochemical and geological data: A case study from the semiarid Kalahari},
URL = {http://cat.inist.fr/?aModele=afficheN{\&}cpsidt=1021076},
ISBN = {1-901502-56-2},
series = {Red Book Series},
number = {269},
volume = {269},
year = {2001},
publisher = {IAHS Red Book Series},
address = {Wallingford U.K.},
booktitle = {Impact of human activity on groundwater dynamics},
pages = {25--31}
}

2000 (7)

C. Külls, E. Adar, P. Udluft (2000) Resolving patterns of groundwater flow by inverse hydrochemical modelling in a semiarid Kalahari basin. IAHS pp. 447–451. web bibtex

@article{Kulls.12,
author = {K\"ulls, C. and Adar, E. and Udluft, P.},
title = {Resolving patterns of groundwater flow by inverse hydrochemical modelling in a semiarid Kalahari basin},
URL = {http://iahs.info/redbooks/a262/26265.htm},
number = {262},
year = {2000},
journal = {IAHS},
pages = {447--451}
}

C. Külls, E. Salameh, P. Udluft (2000) Assessing water supplies for irrigation - availability of natural resources and sustainability indices. web bibtex

@misc{Kulls.53,
author = {K\"ulls, C. and Salameh, E. and Udluft, P.},
title = {Assessing water supplies for irrigation - availability of natural resources and sustainability indices},
URL = {http://ftp.gwdg.de/pub/tropentag/proceedings/2000/Full{\%}20Papers/Section{\%}20II/WG{\%}20d/Kuells{\%}20C.pdf},
organization = {Univ. Hohenheim},
year = {2000},
location = {Hohenheim}
}

C. Külls (2000) Groundwater of the North-Western Kalahari, Namibia: Estimation of recharge and quantification of the flow systems. Doktorarbeit, Universität Würzburg Würzburg. bibtex

@phdthesis{Kulls.14,
author = {K\"ulls, C.},
title = {Groundwater of the North-Western Kalahari, Namibia: Estimation of recharge and quantification of the flow systems},
year = {2000},
school = {Maximilians University},
address = {W\"urzburg},
journal = {Doktorarbeit, Universit\"at W\"urzburg}
}

C. Külls, P. Udluft (2000) Mapping the availability and dynamics of groundwater recharge. Part II: Case studies. In 3rd Congress on Regional Geological Cartography and Information Systems. pp. 163–168. bibtex

@incollection{Kulls.23,
author = {K\"ulls, C. and Udluft, P.},
title = {Mapping the availability and dynamics of groundwater recharge. Part II: Case studies},
year = {2000},
booktitle = {3rd Congress on Regional Geological Cartography  and Information Systems},
pages = {163--168}
}

H. Klock, C. Külls, P. Udluft (2000) Estimation of relative recharge values for the northern Kalahari catchment, Namibia. Journal of African Earth Sciences 22 (4) pp. 47. web bibtex

@article{Klock.37,
author = {Klock, H. and K\"ulls, C. and Udluft, P.},
title = {Estimation of relative recharge values for the northern Kalahari catchment, Namibia},
URL = {http://www.csa.com/partners/viewrecord.php?requester=gs\textbackslash{\&}collection=ENV\textbackslash{\&}recid=4873320},
volume = {22},
number = {4},
year = {2000},
journal = {Journal of African Earth Sciences},
pages = {47}
}

P. Udluft, C. Külls (2000) Mapping the availability and dynamics of groundwater recharge: Part I: Modelling techniques. In 3rd Congress on Regional Geological Cartography and Information Systems. pp. 337–340. bibtex

@incollection{Udluft.16,
author = {Udluft, P. and K\"ulls, C.},
title = {Mapping the availability and dynamics of groundwater recharge: Part I: Modelling techniques},
booktitle = {3rd Congress on Regional Geological Cartography  and Information Systems},
pages = {337--340},
year = {2000}
}

E. Zagana, C. Külls, P. Udluft (2000) Hydrochemie und Wasserhaushalt des Aliakmonas. Vom Wasser 94 pp. 29–39. web bibtex

@article{Zagana.39,
author = {Zagana, E. and K\"ulls, C. and Udluft, P.},
title = {Hydrochemie und Wasserhaushalt des Aliakmonas},
URL = {http://cat.inist.fr/?aModele=afficheN{\&}cpsidt=1328751},
ISSN = {0083-6915},
volume = {94},
year = {2000},
journal = {Vom Wasser},
pages = {29--39}
}

1997 (1)

S. Demuth, C. Külls (1997) Probability analysis and regional aspects of droughts in southern Germany. In Sustainability of Water Resources under Increasing Uncertainty. pp. 97–114. IAHS Red Book Series. Wallingford U.K.. bibtex

@incollection{Demuth.15,
author = {Demuth, S. and K\"ulls, C.},
editor = {Rosberg, D. and al.},
title = {Probability analysis and regional aspects of droughts in southern Germany},
series = {Red Book Series},
volume = {240},
year = {1997},
publisher = {IAHS Red Book Series},
address = {Wallingford U.K.},
booktitle = {Sustainability of Water Resources under Increasing Uncertainty},
pages = {97--114}
}

1994 (2)

C. Külls, C. Leibundgut, U. Schwarz, A. Schick (August 1994) Channel infiltration study using dye tracers. IAHS pp. 429–436. web bibtex

@article{Kulls.13,
author = {K\"ulls, C. and Leibundgut, C. and Schwarz, U. and Schick, A.},
title = {Channel infiltration study using dye tracers},
URL = {http://iahs.info/redbooks/a232/iahs{\_}232{\_}0429.pdf},
ISSN = {0-947571-64-7},
number = {232},
year = {1994},
journal = IAHS,
pages = {429--436},
month = {August}
}

C. Külls (1994) Transmission Losses from Ephemeral Floods in Nahal Zin, Israel. Albert Ludwigs University Freiburg. bibtex

@mastersthesis{Kulls.19,
author = {K\"ulls, C.},
title = {Transmission Losses from Ephemeral Floods in Nahal Zin, Israel},
year = {1994},
school = {M. Sc. Thesis, Institute of Hydrology},
address = {Albert Ludwigs University Freiburg}
}

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