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D.n. Lerner - One of the best experts on this subject based on the ideXlab platform.
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Pollutant attenuation at the groundwater-surface water interface: A classification scheme and statistical analysis using national-scale nitrate data
Journal of Hydrology, 2009Co-Authors: J.w.n. Smith, B.w.j. Surridge, T.h. Haxton, D.n. LernerAbstract:Summary A classification scheme for pollutant natural attenuation potential at the groundwater–surface water interface is presented, and its predictive power for explaining baseflow River nitrate concentration investigated. Both the classification scheme and statistical analysis are undertaken at Water Framework Directive surface water body scale for England and Wales, in baseflow conditions when relative groundwater contribution to Rivers is greatest. The results of multiple regression analyses demonstrate statistically significant relationships between the classification of natural attenuation potential, its component properties, and baseflow River nitrate concentration. Natural attenuation at the groundwater–surface water interface is shown to be a significant control on observed River nitrate concentrations, albeit less influential than land-use descriptors. The results indicate that natural attenuation processes have a measurable impact on baseflow River Chemistry at surface water body scale, and that consideration of natural attenuation processes at the groundwater–surface water interface would improve regional and catchment-scale risk prediction, and could help in the design of more sustainable catchment management strategies.
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Pollutant attenuation at the groundwater–surface water interface: A classification scheme and statistical analysis using national-scale nitrate data
Journal of Hydrology, 2009Co-Authors: J.w.n. Smith, B.w.j. Surridge, T.h. Haxton, D.n. LernerAbstract:A classification scheme for pollutant natural attenuation potential at the groundwater–surface water interface is presented, and its predictive power for explaining baseflow River nitrate concentration investigated. Both the classification scheme and statistical analysis are undertaken at Water Framework Directive surface water body scale for England and Wales, in baseflow conditions when relative groundwater contribution to Rivers is greatest. The results of multiple regression analyses demonstrate statistically significant relationships between the classification of natural attenuation potential, its component properties, and baseflow River nitrate concentration. Natural attenuation at the groundwater–surface water interface is shown to be a significant control on observed River nitrate concentrations, albeit less influential than land-use descriptors. The results indicate that natural attenuation processes have a measurable impact on baseflow River Chemistry at surface water body scale, and that consideration of natural attenuation processes at the groundwater–surface water interface would improve regional and catchment-scale risk prediction, and could help in the design of more sustainable catchment management strategies
J.w.n. Smith - One of the best experts on this subject based on the ideXlab platform.
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Pollutant attenuation at the groundwater-surface water interface: A classification scheme and statistical analysis using national-scale nitrate data
Journal of Hydrology, 2009Co-Authors: J.w.n. Smith, B.w.j. Surridge, T.h. Haxton, D.n. LernerAbstract:Summary A classification scheme for pollutant natural attenuation potential at the groundwater–surface water interface is presented, and its predictive power for explaining baseflow River nitrate concentration investigated. Both the classification scheme and statistical analysis are undertaken at Water Framework Directive surface water body scale for England and Wales, in baseflow conditions when relative groundwater contribution to Rivers is greatest. The results of multiple regression analyses demonstrate statistically significant relationships between the classification of natural attenuation potential, its component properties, and baseflow River nitrate concentration. Natural attenuation at the groundwater–surface water interface is shown to be a significant control on observed River nitrate concentrations, albeit less influential than land-use descriptors. The results indicate that natural attenuation processes have a measurable impact on baseflow River Chemistry at surface water body scale, and that consideration of natural attenuation processes at the groundwater–surface water interface would improve regional and catchment-scale risk prediction, and could help in the design of more sustainable catchment management strategies.
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Pollutant attenuation at the groundwater–surface water interface: A classification scheme and statistical analysis using national-scale nitrate data
Journal of Hydrology, 2009Co-Authors: J.w.n. Smith, B.w.j. Surridge, T.h. Haxton, D.n. LernerAbstract:A classification scheme for pollutant natural attenuation potential at the groundwater–surface water interface is presented, and its predictive power for explaining baseflow River nitrate concentration investigated. Both the classification scheme and statistical analysis are undertaken at Water Framework Directive surface water body scale for England and Wales, in baseflow conditions when relative groundwater contribution to Rivers is greatest. The results of multiple regression analyses demonstrate statistically significant relationships between the classification of natural attenuation potential, its component properties, and baseflow River nitrate concentration. Natural attenuation at the groundwater–surface water interface is shown to be a significant control on observed River nitrate concentrations, albeit less influential than land-use descriptors. The results indicate that natural attenuation processes have a measurable impact on baseflow River Chemistry at surface water body scale, and that consideration of natural attenuation processes at the groundwater–surface water interface would improve regional and catchment-scale risk prediction, and could help in the design of more sustainable catchment management strategies
B.w.j. Surridge - One of the best experts on this subject based on the ideXlab platform.
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Pollutant attenuation at the groundwater-surface water interface: A classification scheme and statistical analysis using national-scale nitrate data
Journal of Hydrology, 2009Co-Authors: J.w.n. Smith, B.w.j. Surridge, T.h. Haxton, D.n. LernerAbstract:Summary A classification scheme for pollutant natural attenuation potential at the groundwater–surface water interface is presented, and its predictive power for explaining baseflow River nitrate concentration investigated. Both the classification scheme and statistical analysis are undertaken at Water Framework Directive surface water body scale for England and Wales, in baseflow conditions when relative groundwater contribution to Rivers is greatest. The results of multiple regression analyses demonstrate statistically significant relationships between the classification of natural attenuation potential, its component properties, and baseflow River nitrate concentration. Natural attenuation at the groundwater–surface water interface is shown to be a significant control on observed River nitrate concentrations, albeit less influential than land-use descriptors. The results indicate that natural attenuation processes have a measurable impact on baseflow River Chemistry at surface water body scale, and that consideration of natural attenuation processes at the groundwater–surface water interface would improve regional and catchment-scale risk prediction, and could help in the design of more sustainable catchment management strategies.
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Pollutant attenuation at the groundwater–surface water interface: A classification scheme and statistical analysis using national-scale nitrate data
Journal of Hydrology, 2009Co-Authors: J.w.n. Smith, B.w.j. Surridge, T.h. Haxton, D.n. LernerAbstract:A classification scheme for pollutant natural attenuation potential at the groundwater–surface water interface is presented, and its predictive power for explaining baseflow River nitrate concentration investigated. Both the classification scheme and statistical analysis are undertaken at Water Framework Directive surface water body scale for England and Wales, in baseflow conditions when relative groundwater contribution to Rivers is greatest. The results of multiple regression analyses demonstrate statistically significant relationships between the classification of natural attenuation potential, its component properties, and baseflow River nitrate concentration. Natural attenuation at the groundwater–surface water interface is shown to be a significant control on observed River nitrate concentrations, albeit less influential than land-use descriptors. The results indicate that natural attenuation processes have a measurable impact on baseflow River Chemistry at surface water body scale, and that consideration of natural attenuation processes at the groundwater–surface water interface would improve regional and catchment-scale risk prediction, and could help in the design of more sustainable catchment management strategies
T.h. Haxton - One of the best experts on this subject based on the ideXlab platform.
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Pollutant attenuation at the groundwater-surface water interface: A classification scheme and statistical analysis using national-scale nitrate data
Journal of Hydrology, 2009Co-Authors: J.w.n. Smith, B.w.j. Surridge, T.h. Haxton, D.n. LernerAbstract:Summary A classification scheme for pollutant natural attenuation potential at the groundwater–surface water interface is presented, and its predictive power for explaining baseflow River nitrate concentration investigated. Both the classification scheme and statistical analysis are undertaken at Water Framework Directive surface water body scale for England and Wales, in baseflow conditions when relative groundwater contribution to Rivers is greatest. The results of multiple regression analyses demonstrate statistically significant relationships between the classification of natural attenuation potential, its component properties, and baseflow River nitrate concentration. Natural attenuation at the groundwater–surface water interface is shown to be a significant control on observed River nitrate concentrations, albeit less influential than land-use descriptors. The results indicate that natural attenuation processes have a measurable impact on baseflow River Chemistry at surface water body scale, and that consideration of natural attenuation processes at the groundwater–surface water interface would improve regional and catchment-scale risk prediction, and could help in the design of more sustainable catchment management strategies.
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Pollutant attenuation at the groundwater–surface water interface: A classification scheme and statistical analysis using national-scale nitrate data
Journal of Hydrology, 2009Co-Authors: J.w.n. Smith, B.w.j. Surridge, T.h. Haxton, D.n. LernerAbstract:A classification scheme for pollutant natural attenuation potential at the groundwater–surface water interface is presented, and its predictive power for explaining baseflow River nitrate concentration investigated. Both the classification scheme and statistical analysis are undertaken at Water Framework Directive surface water body scale for England and Wales, in baseflow conditions when relative groundwater contribution to Rivers is greatest. The results of multiple regression analyses demonstrate statistically significant relationships between the classification of natural attenuation potential, its component properties, and baseflow River nitrate concentration. Natural attenuation at the groundwater–surface water interface is shown to be a significant control on observed River nitrate concentrations, albeit less influential than land-use descriptors. The results indicate that natural attenuation processes have a measurable impact on baseflow River Chemistry at surface water body scale, and that consideration of natural attenuation processes at the groundwater–surface water interface would improve regional and catchment-scale risk prediction, and could help in the design of more sustainable catchment management strategies
Carl-magnus Mörth - One of the best experts on this subject based on the ideXlab platform.
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Temporal and spatial variations of rock weathering and CO2 consumption in the Baltic Sea catchment
Chemical Geology, 2017Co-Authors: Carl-magnus Mörth, Christoph Humborg, Bo G. GustafssonAbstract:This study provides the first estimate of silicate and carbonate weathering rates and derived CO2 consumption rates for the Baltic Sea catchment using River Chemistry data of 78 Rivers draining int ...
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Landscape elements and River Chemistry as affected by River regulation – a 3-D perspective
Hydrology and Earth System Sciences, 2009Co-Authors: Erik Smedberg, Christoph Humborg, Martin Jakobsson, Carl-magnus MörthAbstract:Abstract. We tested the hypothesis whether individual land classes within a River catchment contribute equally to River loading with dissolved constituents or whether some land classes act as "hot spots" to River loading and if so, are these land classes especially affected by hydrological alterations. The amount of land covered by forests and wetlands and the average soil depth (throughout this paper soil refers to everything overlying bedrock i.e. regolith) of a River catchment explain 58–93% of the variability in total organic carbon (TOC) and dissolved silicate (DSi) concentrations for 22 River catchments in Northern Sweden. For the heavily regulated Luleälven, with 7 studied sub-catchments, only 3% of the headwater areas have been inundated by reservoirs, some 10% of the soils and aggregated forest and wetland areas have been lost due to damming and further hydrological alteration such as bypassing entire sub-catchments by headrace tunnels. However, looking at individual forest classes, our estimates indicate that some 37% of the deciduous forests have been inundated by the four major reservoirs built in the Luleälven headwaters. These deciduous forest and wetlands formerly growing on top of alluvial deposits along the River corridors forming the riparian zone play a vital role in loading River water with dissolved constituents, especially DSi. A digital elevation model draped with land classes and soil depths which highlights that topography of various land classes acting as hot spots is critical in determining water residence time in soils and biogeochemical fluxes. Thus, headwater areas of the Luleälven appear to be most sensitive to hydrological alterations due to the thin soil cover (on average 2.7–4.5 m) and only patchy appearance of forest and wetlands that were significantly perturbed. Hydrological alterations of these relatively small headwater areas significantly impacts downstream flux of dissolved constituents and their delivery to receiving water bodies.
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Landscape elements and River Chemistry as affected by River regulation – a 3-D perspective
Hydrology and Earth System Sciences Discussions, 2008Co-Authors: Erik Smedberg, Christoph Humborg, Martin Jakobsson, Carl-magnus MörthAbstract:Abstract. We tested the hypothesis whether individual land classes within a River catchment contribute equally to River loading with dissolved constituents or whether some land classes act as "hot spots" to River loading and if so, are these land classes especially affected by hydrological alterations. The amount of land covered by forests and wetlands and the average soil depth of a River catchment explain 58–93% of the variability in total organic carbon (TOC) and dissolved silicate (DSi) concentrations for 22 River catchments in Northern Sweden. Whereas only 3% of the headwater areas of the Luleälven have been inundated by the creation of reservoirs, some 10% of the soils and aggregated forest and wetland areas have been lost due to damming and further hydrological alteration such as bypassing entire sub-catchments by headrace tunnels. However, looking at individual forest classes, our estimates indicate that some 37% of the deciduous forests have been inundated by the four major reservoirs built in the Luleälven headwaters. These deciduous forest and wetlands formerly growing on top of alluvial deposits along the River corridors forming the riparian zone play a vital role in loading River water with dissolved constituents, especially DSi. A digital elevation model draped with land classes and soil depths which highlights that topography of various land classes acting as hot spots is critical in determining water residence time in soils and biogeochemical fluxes. Thus, headwater areas of the Luleälven appear to be most sensitive to hydrological alterations due to the thin soil cover (on average 2.7–4.5 m) and only patchy appearance of forest and wetlands that were significantly perturbed. Moreover, since these headwater areas are characterized often by high specific discharge, this relatively minor change in the landscape when compared to the entire River catchment may indeed explain the significant lower fluxes at the River mouth.
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Trace metals and sulphur isotopes in samll boreal streams: the influence of landscape type
2008Co-Authors: Louise Björkvald, Hjalmar Laudon, Hans Borg, Carl-magnus MörthAbstract:The transport of trace metals (TM) and dissolved organic carbon (DOC) from headwater streams to the sea is influenced by various landscape elements. Our focus was to investigate the influence of major landscape elements on observed concentrations of dissolved metals (e.g. As, Cd, Co, Fe, Pb), DOC, sulphate, and sulphur isotope composition in streams, north- eastern Sweden, a coastal region characterized by peat wetlands and coniferous forests.Stream water samples collected from 10 streams (0.13 to 67 km2) in a boreal stream network reveal that landscape type (i.e. coverage of wetland and forest) is significant for River Chemistry. Streams with different catchment characteristics responded differently to hydrological episodes. In forested streams, concentrations of TM, Fe and DOC increased, while they decreased in wetland influenced streams. Furthermore, Fe and Pb correlated positively with wetland coverage. Moreover, significantly lower average sulphate concentrations, but higher isotope values, were observed in wetland streams.This study emphasises the importance of understanding stream water Chemistry from a landscape perspective in order to identify potential environments where climate change may induce enhanced metal mobilization in the future.
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Weathering rates and origin of inorganic carbon as influenced by River regulation in the boreal sub-arctic region of Sweden
Hydrology and Earth System Sciences Discussions, 2007Co-Authors: Jenni Brink, Christoph Humborg, Lars Rahm, Jörgen Sahlberg, Carl-magnus MörthAbstract:Major environmental stressors of boreal and sub-arctic Rivers are hydrological changes and global warming and both factors will significantly influence the future evolution of the River Chemistry in high latitudes. We tested the hypothesis whether lower concentrations of dissolved constituents observed in regulated Rivers come along with lower weathering rates, though specific discharge as a major force for physical erosion and weathering is often higher in regulated River systems. In this study the River Chemistry, weathering rates and related carbon dioxide consumption in two large watersheds in the sub arctic region of Sweden, one regulated River (Lule River) and one unregulated River (Kalix River), was investigated. Weathering rates of silicates in the two watersheds are shown to be different; the silicate weathering rate in Kalix River catchment is almost 30% higher than in the Lule River catchment. This is most likely a result of constructing large reservoirs in the former River valleys inundating the alluvial deposits and thus decreasing soil/water contact resulting in lower weathering rates. Furthermore, the difference observed in weathering rates between lowland regions and headwaters suggests that weathering in sub arctic boreal climates is controlled by the residence time for soil water rock interactions followed by lithology. The Chemistry in the two Rivers shows weathering of silicates as the origin for 68% of the inorganic carbon in the Lule River and 74% for Kalix River. The study clearly shows that River regulation significantly decreases alkalinity export to the sea because lower weathering rates gives less carbon dioxide ending up as DIC. By considering sources for inorganic carbon we here report that the inorganic carbon load that originates from respiration of organic matter in soils makes up of 30% and 35% of the total C export for the watersheds of the Kalix River and Lule River, respectively. Therefore, both the inorganic (i.e. the origin of carbon in DIC) and organic carbon load carbon must be considered when studying climate changes on the organic carbon load since effects from increased degradation of organic matter may lead to more weathering (higher production of DIC).
