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Author Külls, C.; Nunes, A.; Köbel-Batista, M.; Branquinho, C.; Bianconi, N.; Costantini, E. openurl 
  Title (up) Integrated use of soil physical and water isotope methods for ecohydrological characterization of desertified areas Type Conference Article
  Year 2014 Publication EGU Geophysical Abstracts Abbreviated Journal  
  Volume Issue Pages 15430  
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  Area Expedition Conference  
  Notes Approved no  
  Call Number THL @ christoph.kuells @ Kuells2014integrated Serial 46  
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Author Rossetto, R.; Filippis, G.D.; Borsi, I.; Foglia, L.; Cannata, M.; Criollo, R.; Vázquez-Suñé, E. url  openurl
  Title (up) Integrating free and open source tools and distributed modelling codes in GIS environment for data-based groundwater management Type Journal Article
  Year 2018 Publication Environmental Modelling & Software Abbreviated Journal  
  Volume 107 Issue Pages 210-230  
  Keywords Free and Open Source Software, FREEWAT, Groundwater management, ICT, MODFLOW, QGIS  
  Abstract Integrating advanced simulation techniques and data analysis tools in a freeware Geographic Information System (GIS) provides a valuable contribution to the management of conjunctive use of groundwater (the world’s largest freshwater resource) and surface-water. To this aim, we describe here the FREEWAT (FREE and open source software tools for WATer resource management) platform. FREEWAT is a free and open source, QGIS-integrated interface for planning and management of water resources, with specific attention to groundwater. The FREEWAT platform couples the power of GIS geo-processing and post-processing tools in spatial data analysis with that of process-based simulation models. The FREEWAT environment allows storage of large spatial datasets, data management and visualization, and running of several distributed modelling codes (mainly belonging to the MODFLOW family). It simulates hydrologic and transport processes, and provides a database framework and visualization capabilities for hydrochemical analysis. Examples of real case study applications are provided.  
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  ISSN 1364-8152 ISBN Medium  
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  Notes Approved no  
  Call Number THL @ christoph.kuells @ rossetto_integrating_2018 Serial 92  
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Author Klaus, J.; Külls, C. openurl 
  Title (up) Integrating residence time data in mixing cell modeling-Application to the Lower Kuiseb Dune area Type Conference Article
  Year 2009 Publication EGU Geophysical Abstracts Abbreviated Journal  
  Volume Issue Pages 11026  
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  Notes Approved no  
  Call Number THL @ christoph.kuells @ Klaus2009integrating Serial 54  
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Author Vushe, A.; Amutenya, M. url  openurl
  Title (up) Investigating nitrate retention capacity, elementary and mineral composition of Kalahari sandy soils at Mashare farm in Namibia, Okavango river basin Type Journal Article
  Year 2019 Publication Scientific African Abbreviated Journal  
  Volume 6 Issue Pages 00193  
  Keywords Irrigated field, Cultivated Kalahari sandy soil, Leaching, Nitrate retention capacity, Quartz mineral, Water saturated  
  Abstract Kalahari sands which cover a large part of Southern Africa and extend into Central Africa are infertile and marginal soils for intensive agriculture. Therefore, high nitrogen fertilisation rates may degrade ecosystems of rivers with catchments covered by the Kalahari sands. A study on Mashare Farm located in the Okavango River basin showed that irrigated Kalahari sandy soils had a nitrate retention capacity, which enabled the soil to resist nitrate leaching in water saturated conditions. The irrigated soils were modified by agricultural activities; hence this study investigated if uncultivated and cultivated Kalahari sand soils had similar nitrate retention properties. The elementary composition of the soils was investigated for obtaining an insight into chemical properties that may be causing the nitrate retention capacity. A permeameter was used to leach out nitrates from irrigated and uncultivated soil samples, and nitrate concentrations were measured on the leaching effluent from the permeameter. Elemental analysis was done on the cultivated and the uncultivated soil samples using a Scanning Electron Microscope, a portable X-Ray Fluorescence analyzer, and an X-Ray Diffraction machine, and the later was also used for crystalline structure analyses. Sieve analyses confirmed that the Mashare’s cultivated and uncultivated topsoils were similar, and both were similar to Botswana Kalahari topsoil. The irrigated and cultivated subsoil had a higher average nitrate retention capacity of 76% compared to 73% for the uncultivated subsoil. Both samples had the same elements, although the proportions were different. Both soil samples were dominated by a quartz mineral, but the field soil had traces of palygorskite. The presence of aluminum and transition metals outside the minerals structure, but as coatings on the quartz sand grains enhanced nitrate retention capacity properties of the Kalahari sand soils.  
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  ISSN 2468-2276 ISBN Medium  
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  Notes Approved no  
  Call Number THL @ christoph.kuells @ VUSHE2019e00193 Serial 277  
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Author Abadi, B.; Sadeghfam, S.; Ehsanitabar, A.; Nadiri, A.A. url  openurl
  Title (up) Investigating socio-economic and hydrological sustainability of ancient Qanat water systems in arid regions of central Iran Type Journal Article
  Year 2023 Publication Groundwater for Sustainable Development Abbreviated Journal  
  Volume 23 Issue Pages 100988  
  Keywords Ancient irrigation, QWSs, GIS, Indigenous knowledge, Maintenance, Distribution  
  Abstract The Qanat water systems (QWSs), the ancient water engineering systems in Iran belonging to the very distant past, have harvested groundwater from drainages to convey it toward the surface with no use of energy. The present article highlights the socio-economic aspects of the sustainability of the QWSs and gives a satisfactory explanation of why the QWSs should be restored. In doing so, we subscribe to the view that indigenous and scientific knowledge should be incorporated. The former serves to tackle the restoration of the QWSs, the latter contributes to the distribution of water into the farmlands as efficiently as possible. Measured by (a) resilience, (b) reliability, (c) vulnerability, and (d) sustainability, the GIS technique made clear the performance of the QWSs has, therefore, the worst condition observed in terms of resiliency; the best condition observed concerning the vulnerability. Moreover, the QWSs have intermediate performance in terms of reliability. Finally, the sustainability index (SI) classifies the QWSs into different bands, which provide explicit support to take priority of the selection of the QWSs for restoration. In conclusion, a theoretical framework has been drawn to keep the QWSs sustainable.  
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  ISSN 2352-801x ISBN Medium  
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  Notes Approved no  
  Call Number THL @ christoph.kuells @ Abadi2023100988 Serial 268  
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Author Mahindawansha, A.; Külls, C.; Kraft, P.; Breuer, L. url  doi
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  Title (up) Investigating unproductive water losses from irrigated agricultural crops in the humid tropics through analyses of stable isotopes of water Type Journal Article
  Year 2020 Publication Hydrology and Earth System Sciences Abbreviated Journal  
  Volume 24 Issue 7 Pages 3627-3642  
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  Publisher Copernicus GmbH Place of Publication Editor  
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  Notes Approved yes  
  Call Number THL @ christoph.kuells @ Mahindawansha2020investigating Serial 14  
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Author Schwiede, M.; Duijnisveld, W.H.M.; Böttcher, J. url  openurl
  Title (up) Investigation of processes leading to nitrate enrichment in soils in the Kalahari Region, Botswana Type Journal Article
  Year 2005 Publication Physics and Chemistry of the Earth, Parts A/B/C Abbreviated Journal  
  Volume 30 Issue 11 Pages 712-716  
  Keywords Nitrate, Arenosol soils, Semi-arid, Kalahari, Cattle, Chloride, Travel time  
  Abstract In Southern Africa elevated nitrate concentrations are observed in mostly uninhabited semi-arid areas. In the Kalahari of Botswana groundwater locally exhibits concentrations up to 600mg/l. It is assumed, that nitrate found in the groundwater originates mainly from nitrogen input and transformations in the soils. Our investigations in the Kalahari between Serowe and Orapa show that cattle raising is an important source for enhanced nitrate concentrations in the soils (Arenosols). But also in termite mounds very high nitrate stocks were found, and under natural vegetation (acacia trees and shrubs) nitrate concentrations were mostly unexpectedly high. This nitrate enrichment in the soils poses a serious threat to the groundwater quality. However, calculated soil water age distributions in the unsaturated zone clearly show that today’s nitrate pollution of the groundwater below the investigation area could originate from natural sources, but cannot be caused by the current land use for cattle raising.  
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  ISSN 1474-7065 ISBN Medium  
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  Notes Integrated Water Resources Management (IWRM) and the Millennium Development Goals: Managing Water for Peace and Prosperity Approved no  
  Call Number THL @ christoph.kuells @ Schwiede2005712 Serial 276  
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Author Voerkelius, S.; Külls, C.; Santiago, M.M.F.; Frischkorn, H.; dos Santos Semrau, L.A.; Heinrichs, G.; Gil, M.M.L. url  openurl
  Title (up) Investigations on water management and water quality in Picos/PI and Tauá/CE Type Book Chapter
  Year 2003 Publication Global change and regional impacts Abbreviated Journal  
  Volume Issue Pages 173-184  
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  Publisher Springer, Berlin, Heidelberg Place of Publication Editor  
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  Notes Approved no  
  Call Number THL @ christoph.kuells @ Voerkelius2003investigations Serial 40  
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Author Wang, B.; Luo, Y.; Liu, J.-hui; Li, X.; Zheng, Z.-hong; Chen, Q.-qian; Li, L.-yao; Wu, H.; Fan, Q.-ren url  openurl
  Title (up) Ion migration in in-situ leaching (ISL) of uranium: Field trial and reactive transport modelling Type Journal Article
  Year 2022 Publication Journal of Hydrology Abbreviated Journal  
  Volume 615 Issue Pages 128634  
  Keywords Acid in situ leaching, Banyan-Uul uranium deposit, Influence area, Reactive transport, Sensitivity analysis  
  Abstract Acid in-situ leaching (ISL) can be used as a mining technique for in situ uranium recover from underground. Acids and oxidants as lixiviants were continuously injected into a sandstone-type uranium deposit in Bayan-Uul (China). It was conducted to facilitate the dissolution of uranium minerals to generate uranyl ions, which could then be extracted for the recovery of uranium resources by the pumping cycle. A reactive transport model based on PHAST was developed to investigate the dynamic reactive migration process of uranium. The simulated results well reproduce the fluid dynamic evolution in the injecting and pumping units, as well as the dynamic release of uranium. The simulated leaching area indicates that the uranium ore leaching area was much larger than the acidification area. In addition, the pollution plume of uranium and acid water was larger than that of the leaching area, which can be used as a reference for uranium mining schemes. Furthermore, the parameter sensitivity analysis indicates the volume fraction of uranium ore and the reaction rate were the main factors affecting uranium leaching efficiency. Without considering the blockage of pores by precipitation, the Fe2+ in the reinjection fluid had a significant negative influence on uranium leaching.  
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  ISSN 0022-1694 ISBN Medium  
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  Notes Approved no  
  Call Number THL @ christoph.kuells @ wang_ion_2022 Serial 195  
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Author Kamash, Z. url  openurl
  Title (up) Irrigation technology, society and environment in the Roman Near East Type Journal Article
  Year 2012 Publication Journal of Arid Environments Abbreviated Journal  
  Volume 86 Issue Pages 65-74  
  Keywords Army, Urbanism, Qanats, Dams, Field systems, Irrigation channels  
  Abstract This paper uses a multi-faceted approach to understand the use and distribution of different irrigation technologies in the Roman Near East (63 BC – AD 636), looking at the ways in which social and environmental factors affected the implementation of those irrigation technologies. It is argued that no single factor can fully explain how irrigation technologies were used across time and space in this region. Instead, choices in irrigation technology seem to have been governed by a complex nexus of both social and environmental factors.  
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  ISSN 0140-1963 ISBN Medium  
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  Notes Ancient Agriculture in the Middle East Approved no  
  Call Number THL @ christoph.kuells @ Kamash201265 Serial 259  
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