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Gunkel, A. Külls, C. |
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Title |
Towards agent-based modelling of stakeholder behaviour – a pilot study on drought vulnerability of decentral water supply in NE Brazil |
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2006 |
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International Congress on Environmental Modelling and Sofware |
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3rd International Congress on Environmental Modelling and Sofware – Burlington, Vermont |
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THL @ christoph.kuells @ |
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74 |
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Strandmann, P.A.E.P. von; Reynolds, B.C.; Porcelli, D.; James, R.H.; Calsteren, P. van; Baskaran, M.; Burton, K.W. |
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Title |
Assessing continental weathering rates and actinide transport in the Great Artesian Basin |
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Journal Article |
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2006 |
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Geochimica et Cosmochimica Acta |
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70 |
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18, Supplement |
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497 |
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0016-7037 |
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THL @ christoph.kuells @ strandmann_assessing_2006 |
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116 |
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Frumkin, A.; Gvirtzman, H. |
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Title |
Cross-formational rising groundwater at an artesian karstic basin: the Ayalon Saline Anomaly, Israel |
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Journal Article |
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2006 |
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Journal of Hydrology |
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318 |
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1 |
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316-333 |
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Confined karst, Groundwater, HS, Maze caves, Rising water, Yarkon–Taninim aquifer |
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It is proposed that a geothermal artesian karstic system at the central part of the Yarkon–Taninim aquifer creates the ‘Ayalon Saline Anomaly’ (ASA), whose mechanism has been under debate for several decades. A 4-year-long detailed groundwater monitoring was carried out at 68 new shallow boreholes in the Ayalon region, accompanied by a comprehensive survey of karstic voids. Results indicate the rising of warm-brackish groundwater through highly permeable swarms of karstic shafts, serving as an outflow of the artesian geothermal system. The ASA area contains ‘hot spots’, where groundwater contrasts with ‘normal’ water hundreds of meters away. The ASA temperature reaches 30°C (∼5°C warmer than its surroundings), chloride concentration reaches 528mg/l (50–100mg/l in the surrounding), H2S concentration reaches 5.6mg/l (zero all around) and pH value is 7.0 (compared with 7.8 around). Subsequently, the hydrothermal water flows laterally of at the watertable horizon through horizontal conduits, mixing with ‘normal’ fresh water which had circulated at shallow depth. Following rainy seasons, maximal watertable rise is observed in the ASA compared to its surroundings. Regional hydrogeology considerations suggest that the replenishment area for the ASA water is at the Samaria Mountains, east of the ASA. The water circulates to a great depth while flowing westward, and a cross-formational upward flow is then favored close the upper sub-aquifer’s confinement border. |
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0022-1694 |
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THL @ christoph.kuells @ frumkin_cross-formational_2006 |
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117 |
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Author |
Gómez, P.; Garralón, A.; Buil, B.; Turrero, M.J.; Sánchez, L.; Cruz, B. de la |
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Title |
Modeling of geochemical processes related to uranium mobilization in the groundwater of a uranium mine |
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Journal Article |
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Year |
2006 |
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Science of The Total Environment |
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366 |
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1 |
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295-309 |
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Geochemical modeling, Granite, Groundwater, Uranium mine, Uranium retention |
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This paper describes the processes leading to uranium distribution in the groundwater of five boreholes near a restored uranium mine (dug in granite), and the environmental impact of restoration work in the discharge area. The groundwater uranium content varied from \textless1 μg/L in reduced water far from the area of influence of the uranium ore-containing dyke, to 104 μg/L in a borehole hydraulically connected to the mine. These values, however, fail to reflect a chemical equilibrium between the water and the pure mineral phases. A model for the mobilization of uranium in this groundwater is therefore proposed. This involves the percolation of oxidized waters through the fractured granite, leading to the oxidation of pyrite and arsenopyrite and the precipitation of iron oxyhydroxides. This in turn leads to the dissolution of the primary pitchblende and, subsequently, the release of U(VI) species to the groundwater. These U(VI) species are retained by iron hydroxides. Secondary uranium species are eventually formed as reducing conditions are re-established due to water–rock interactions. |
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0048-9697 |
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THL @ christoph.kuells @ gomez_modeling_2006 |
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162 |
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Rehm-Berbenni, C.; Druta A.; Åberg, G.; Neguer J.; Külls, C.; Patrizi, G.; Pacha, T.; Kienzle, P.; Bugini, R.; Fiore, M.G. |
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Title |
Isotope Technologies Applied to the Analysis of Ancient Roman Mortars |
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Book Whole |
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2005 |
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European Commission |
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Results of the CRAFT Project EVK4 CT-2001-30004 |
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THL @ christoph.kuells @ |
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73 |
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Min, M.; Chen, J.; Wang, J.; Wei, G.; Fayek, M. |
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Title |
Mineral paragenesis and textures associated with sandstone-hosted roll-front uranium deposits, NW China |
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Journal Article |
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2005 |
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Ore Geology Reviews |
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26 |
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1 |
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51-69 |
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China, Mineralogy, Paragenesis, Sandstone-hosted roll-type uranium deposit |
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We present a first paragenetic study of the Wuyier, Wuyisan, Wuyiyi and Shihongtan sandstone-hosted roll-front uranium deposits, northwest China. The mineralization is hosted by Lower–Middle Jurassic coarse- to medium-grained sandstones, which are dark-gray to black due to a mixture of ore minerals and carbonaceous debris. The sandstone is alluvial fan-braided river facies. Minerals associated with these deposits can be broadly categorized as detrital, authigenic, and ore-stage mineralization. Ore minerals consist of uraninite and coffinite. This is the first noted occurrence of coffinite in this type of deposit in China. Sulfide minerals associated with the uranium minerals are pyrite, marcasite, and less commonly, sphalerite and galena. The sulfide minerals are largely in textural equilibrium with the uranium minerals. However, these sulfide minerals occasionally appear to predate, as well as postdate, the uranium minerals. This implies that there are multiple generations of sulfides associated with these deposits. The ore minerals occur interstitially between fossilized wood cells in the sandstones as well as replace fossilized wood and biotite. The deposits are generally low-grade. Primary uranium minerals associated with the low-grade deposits are generally too small, ranging from 0.2 to 0.3 μm in diameter, to be observed by optical microscopy and are only observed by electron microscopy. Mineral paragenesis and textures indicate that these deposits formed under low temperature (30–50 °C) conditions. |
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0169-1368 |
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THL @ christoph.kuells @ min_mineral_2005 |
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175 |
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Min, M.; Xu, H.; Chen, J.; Fayek, M. |
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Evidence of uranium biomineralization in sandstone-hosted roll-front uranium deposits, northwestern China |
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Journal Article |
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2005 |
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Ore Geology Reviews |
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26 |
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3 |
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198-206 |
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Biomineralization, China, Roll-front uranium deposit, Sandstone |
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We show evidence that the primary uranium minerals, uraninite and coffinite, from high-grade ore samples (U3O8\textgreater0.3%) in the Wuyiyi, Wuyier, and Wuyisan sandstone-hosted roll-front uranium deposits, Xinjiang, northwestern China were biogenically precipitated and psuedomorphically replace fungi and bacteria. Uranium (VI), which was the sole electron acceptor, was likely to have been enzymically reduced. Post-mortem accumulation of uranium may have also occurred through physio-chemical interaction between uranium and negatively-charged cellular sites, and inorganic adsorption or precipitation reactions. These results suggest that microorganisms may have played a key role in formation of the sandstone- or roll-type uranium deposits, which are among the most economically significant uranium deposits in the world. |
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0169-1368 |
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THL @ christoph.kuells @ min_evidence_2005 |
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186 |
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Schwiede, M.; Duijnisveld, W.H.M.; Böttcher, J. |
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Investigation of processes leading to nitrate enrichment in soils in the Kalahari Region, Botswana |
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2005 |
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Physics and Chemistry of the Earth, Parts A/B/C |
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30 |
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11 |
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712-716 |
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Nitrate, Arenosol soils, Semi-arid, Kalahari, Cattle, Chloride, Travel time |
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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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1474-7065 |
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Integrated Water Resources Management (IWRM) and the Millennium Development Goals: Managing Water for Peace and Prosperity |
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THL @ christoph.kuells @ Schwiede2005712 |
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276 |
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Tröger, U.; Dias, C.L.; Guillaumon, J.R.; Iritani, M.A.; Külls, C.; Schuler, G. |
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Remarks and new data about the recharge of the Guarani Aquifer System |
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2004 |
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XXXIII IAH Congress, Abstracts, IAH, Mexico |
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THL @ christoph.kuells @ Troeger2004remarks |
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59 |
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Author |
Külls, C. |
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Demonstration des Potentials der Nitrat-Isotopenanalytik für die Strategieentwicklung der Sanierung Nitrat-belasteter Brunnen |
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2004 |
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Umweltbundesamt |
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Demonstration des Potentials der Nitrat-Isotopenanalytik für die Strategieentwicklung der Sanierung Nitrat-belasteter Brunnen |
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THL @ christoph.kuells @ |
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