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  • Other Sources  (4)
  • Geosciences; Geoecology/Natural Processes; Soil Science & Conservation ; Applied Geosciences ; Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution; Hydrogeology  (3)
  • Cologne cathedral; Xanten cathedral; Altenberg cathedral; Weathering crusts; Pollution impact; Stone decay processes; Drachenfels trachyte  (1)
  • Springer-Verlag  (4)
  • AtlantOS
  • 2015-2019  (4)
  • 1950-1954
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  • Other Sources  (4)
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  • 2015-2019  (4)
  • 1950-1954
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  • 1
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    Bestimmung der Schadstofffrachten an Kontrollebenen mithilfe von Punktkonzentrationsmessungen und Immissionspumpversuchen – ein Vergleich (2018)
    Springer-Verlag
    Details
    Publication Date: 2021-03-29
    Description: Kurzfassung Die Quantifizierung der Schadstofffrachten an Kontrollebenen ist eine entscheidende Voraussetzung zur Bewertung von Grundwasserschadensfällen und zum Nachweis von Natural Attenuation. Hierzu können zwei verschiedene Erkundungsansätze, die Frachtbestimmung basierend auf der Interpolation von Punktkonzentrationsmessungen sowie Immissionspumpversuche, verwendet werden. Punktkonzentrationsmessungen haben den entscheidenden Nachteil, dass in der Regel nur eine ausreichend große Anzahl sicher stellen kann, dass die gesamte Abstromfahne erfasst wird. Immissionspumpversuche können wiederum relativ hohe Grundwasseraufbereitungs- und Entsorgungskosten verursachen und nur in ausreichend durchlässigen Grundwasserleitern durchgeführt werden. Ein Vergleich der Ergebnisse aus der Anwendung beider Erkundungsansätze kann eine Hilfestellung bei der Konzipierung von Erkundungsmaßnahmen bieten. Daher wurden die Resultate von vier Immissionspumpversuchen mit Messungen in 13, in kurzem Abstand zueinander errichteten, Direct-Push-Messstellen auf dem Gelände eines ehemaligen Gaswerks verglichen. Es konnte festgestellt werden, dass die Vergleichbarkeit der Erkundungsergebnisse je nach Standortsituation stark von der Heterogenität der Verteilung der Schadstoffe im Grundwasserleiter abhängt. Die Studie legt nahe, dass insbesondere bei stark heterogenen Verhältnissen im Grundwasserleiter Immissionspumpversuche bei der Wahl der Erkundungsmethode bevorzugt werden sollten, da die Interpolation von Punktkonzentrationsmessungen selbst im Falle eines relativ engmaschigen Messstellennetzes zu einer großen Erkundungsunsicherheit führen kann.
    Description: The quantification of contaminant mass flow rates at control planes is an essential prerequisite for assessing contaminated sites and for providing evidence of natural attenuation. Two different investigation approaches are usually implemented: mass flow estimation based on interpolation of point scale concentration measurements, and integral pumping tests. Point scale concentration measurements have the crucial disadvantage that in general, only a sufficiently dense monitoring network can ensure that the plume is completely covered. On the other hand, integral pumping tests may require expensive groundwater treatment and disposal and are only applicable in sufficiently conductive aquifers. A comparison of results from the application of both approaches can help with respect to the selection of a subsurface investigation method. A former gasworks site was chosen to compare the results of four integral pumping tests and measurements obtained from 13 direct-push-wells, which were installed at a relatively close spacing. The comparison shows that the correlation of the two methods depends strongly on the heterogeneity of the contaminant distribution within the aquifer. The study suggests that especially in the case of heterogeneous settings, integral pumping tests should be chosen for subsurface investigations, as interpolated point scale concentration measurements, even if densely spaced, can still bear a prohibitively high degree of uncertainty.
    Keywords: contaminant mass flow rate; integral pumping tests; point scale concentration measurements; remediation optimization ; 551 ; Geosciences; Geoecology/Natural Processes; Soil Science & Conservation ; Applied Geosciences ; Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution; Hydrogeology
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  • 2
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    Integrale Quantifizierung von Schadstoffmassenflüssen im Grundwasser – Konditionierung der numerischen Inversion der Konzentrationsganglinien von Immissionspumpversuchen (2018)
    Springer-Verlag | Springer-Verlag
    Details
    Publication Date: 2021-03-29
    Description: Kurzfassung Auf dem Gelände eines ehemaligen Gaswerks (Testfeld Süd) wurden Immissionspumpversuche (IPVs) zur Quantifizierung der Fracht und der mittleren Konzentration gaswerkstypischer Schadstoffe entlang von drei Kontrollquerschnitten durchgeführt. Die daraus resultierenden Konzentrationsganglinien wurden mithilfe des Inversionsprogramms CSTREAM und eines Strömungs- und Transportmodells des hydraulisch extrem heterogenen Grundwasserleiters numerisch ausgewertet. Die den gesamten Abstrombereich der Verdachtsfläche erfassenden Kontrollquerschnitte ermöglichen Aussagen über die Position und Ausbreitung der Schadstofffahne auf dem Gelände des Testfeldes Süd. Bisherige Auswertungen von IPVs konnten die Verteilung der Schadstofffahne um den IPV-Brunnen für genau drei Fälle berechnen: entweder befindet sich die Fahne links vom Brunnen, rechts davon oder ist symmetrisch um ihn verteilt. Um eine realistischere Vorstellung von der Fahnenposition zu ermöglichen, wurden in dieser Studie zusätzlich Direct-Push-Messstellen entlang einer Kontrollebene installiert. Die in diesen Messstellen gemessenen Konzentrationen wurden zur Konditionierung der numerischen Inversionslösung herangezogen. Die Ergebnisse ermöglichen eine genauere Eingrenzung des Fahnenzentrums sowie des Fahnenrandes, was insbesondere die Erarbeitung angepasster und optimierter Sanierungsstrategien unterstützt.
    Description: A series of integral pumping tests (IPTs) were conducted at a former gasworks site to quantify the contaminant mass flux and average concentration in groundwater along three control planes. The resulting concentration-time series were analysed numerically with the help of the inversion code CSTREAM and a flow and transport model representing the highly heterogeneous aquifer. Since the control planes cover the entire downstream width of the potentially contaminated area, they allow conclusions to be drawn about the current location and spread of the contaminant plume. Previous evaluations of integral pumping tests could calculate three scenarios concerning the spread of the plume around the IPT well: (i) the plume is located to the right of the well, (ii) to the left, or (iii) is distributed symmetrically around it. To create a more realistic picture of the plume position, a series of direct-push monitoring wells were installed along one control plane. The concentrations found in these wells were included in the numerical analysis to condition the inversion results, and resulted in a more pronounced plume centre and fringe, which supports the development of optimised remediation strategies.
    Keywords: integral pumping tests; conditioning; plume delineation; remediation optimisation ; 551 ; Geosciences; Geoecology/Natural Processes; Soil Science & Conservation ; Applied Geosciences ; Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution; Hydrogeology
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  • 3
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    The effect of air pollution on stone decay: the decay of the Drachenfels trachyte in industrial, urban, and rural environments—a case study of the Cologne, Altenberg and Xanten cathedrals (2018)
    Springer-Verlag | Berlin/Heidelberg
    Details
    Publication Date: 2021-03-29
    Description: Severe stone deterioration is evident at the Cologne cathedral. In particular, the “Drachenfels” trachyte, which was the building material of the medieval construction period, shows significant structural deterioration as well as massive formation of gypsum crusts. The present article investigates crust formation on limestone, sandstone, and volcanic rock from the Cologne cathedral as well as from the Xanten and Altenberg cathedrals. These three buildings, showing varying degrees of deterioration, are located in different areas and exposed to varying industrial, urban, and rural pollution. Thin laminar and black framboidal crusts form on calcareous as well as silicate stone. The lack of a significant intrinsic calcium and sulfur source for the formation of the gypsum crusts on the Drachenfels trachyte indicates major extrinsic environmental impact: a sufficient offer of SOx from pollutant fluxes as well as external calcium sources (e.g., pollution, mortars, neighboring calcite stones). Chemical analyses reveal strong gypsum enrichment within the crusts as well as higher concentrations of lead and other pollutants (arsenic, antimony, bismuth, tin, etc.), which generally can be linked to traffic and industry. The formation of weathering crusts in an industrial environment is clearly distinguishable from that in rural areas. Scanning electron microscopy observations confirm that the total amount of pollution is less at the Altenberg cathedral than at the Cologne and Xanten cathedrals. XRF analyses show that the formation of gypsum occurs in lower amounts at Altenberg. This correlates well with the measured SO2 content and the intensity of the decay at the different locations. Furthermore, the different types of crusts, e.g., framboidal and laminar, can be differentiated and assigned to the different locations. The black weathering crusts on the silicate Drachenfels trachyte contribute to the degradation of the historic building material. They enhance mechanical moisture-related deterioration processes and the decay by chemical corrosion of rock-forming minerals. Although SO2 concentrations in air have shown a strong decrease over the past 30 years, degradation in connection with weathering crusts is still observed. This indicates that not only contemporary or recent emissions, but also past pollutant concentrations have to be considered.
    Keywords: Cologne cathedral; Xanten cathedral; Altenberg cathedral; Weathering crusts; Pollution impact; Stone decay processes; Drachenfels trachyte ; 551 ; Earth Sciences; Geology
    Language: English
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  • 4
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    International Year of the Planet Earth (IYPE) und unsere FH-DGG-Tagung in Göttingen, Mai 2008 (2018)
    Springer-Verlag | Springer-Verlag
    Details
    Publication Date: 2021-03-29
    Keywords: 551 ; Geosciences; Geoecology/Natural Processes; Soil Science & Conservation ; Applied Geosciences ; Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution; Hydrogeology
    Type: article , publishedVersion
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