Hydrodynamic dispersion in karstified limestones and dolomites in the Upper Jurassic of the Franconian Alb, F.R.G.

Seiler, Klaus-Peter; Małoszewski, Piotr; Behrens, H.

doi:10.1016/0022-1694(89)90285-0

Cited by 20 publications

(16 citation statements)

References 6 publications

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“…To the contrary, the reef facies has an effective porosity of 7 vol%, determined in independent laboratory experiments (Michel 1999). The high matrix porosity of the reef facies demanded a double porosity concept for the tracer transport (Maloszewski and Zuber 1985) and was already used for the interpretation of artificial and environmental tracer experiments in the Franconian Alb by Seiler et al (1989) and Rau (1999), respectively. The porous carbonate aquifer contains mobile water in fissures and immobile water in the porous rock matrix ( Figure 2).…”

Section: Experimental Sitementioning

confidence: 99%

“…Some studies like: Mariotti et al (1988), Bo¨ttcher et al (1990), Aravena and Robertson (1998) or Voerkelius (1990) document that bacterial denitrification can take place in porous aquifers. In comparison to porous aquifers karst systems have low dispersivities in fissures (Seiler et al 1989) and possess low purification capacity (Ho¨tzl 1999). In the karst system of the FRA, groundwater velocities in the range of km/day can be observed (Seiler et al 1989).…”

Section: Introductionmentioning

confidence: 99%

“…In comparison to porous aquifers karst systems have low dispersivities in fissures (Seiler et al 1989) and possess low purification capacity (Ho¨tzl 1999). In the karst system of the FRA, groundwater velocities in the range of km/day can be observed (Seiler et al 1989). Therefore pollutants can flow over considerable distances without retention.…”

Section: Introductionmentioning

confidence: 99%

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Estimation of denitrification potential in a karst aquifer using the 15N and 18O isotopes of NO 3 −

2005

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A confined aquifer in the Malm Karst of the Franconian Alb, South Germany was investigated in order to understand the role of the vadose zone in denitrifiaction processes. The concentrations of chemical tracers Sr 2+ and Cl À and concentrations of stable isotope 18 O were measured in spring water and precipitation during storm events. Based on these measurements a conceptual model for runoff was constructed. The results indicate that pre-event water, already stored in the system at the beginning of the event, flows downslope on vertical and lateral preferential flow paths. Chemical tracers used in a mixing model for hydrograph separation have shown that the pre-event water contribution is up to 30%. Applying this information to a conceptual runoff generation model, the values of d 15 N and d 18 O in nitrate could be calculated. Field observations showed the occurence of significant microbial denitrification processes above the soil/ bedrock interface before nitrate percolates through to the deeper horizon of the vadose zone. The source of nitrate could be determined and denitrification processes were calculated. Assuming that the nitrate reduction follows a Rayleigh process one could approximate a nitrate input concentration of about 170 mg/l and a residual nitrate concentration of only about 15%. The results of the chemical and isotopic tracers postulate fertilizers as nitrate source with some influence of atmospheric nitrate. The combined application of hydrograph separation and determination of isotope values in d 15 N and d 18 O of nitrate lead to an improved understanding of microbial processes (nitrification, denitrification) in dynamic systems.

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Section: Experimental Sitementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Estimation of denitrification potential in a karst aquifer using the 15N and 18O isotopes of NO 3 −

2005

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“…Around 70 tracer test results (Seiler et al, 1989;Einsiedl, 2005) (Fig. 1) and 3 H concentration data in groundwater and precipitation, combined with a dispersion model, were used (Einsiedl and Mayer, 2005) to clarify the hydrogeological conditions of the catchment area and the water flow dynamics of the karst system of the Franconian Alb.…”

Section: Test Field Site and Field Samplingmentioning

confidence: 99%

Rapid biotic molecular transformation of fulvic acids in a karst aquifer

Einsiedl

Hertkorn

Wolf

et al. 2007

Geochimica et Cosmochimica Acta

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The study of molecular transformation processes of dissolved organic carbon (DOC) in the environment significantly contributes to a better understanding of the global biogeochemical organic matter cycle. In an oxic karst groundwater system, in which the most powerful abiotic DOC degradative reactions, photodegradation and metal-mediated redox chemistry, are at best marginal contributors, a near complete turnover of fulvic acids (FAs) has been observed within decades ($60 years). Depletion of oxygen for a very extensive range of aliphatic and aromatic carbon chemical environments has been confirmed as well as the formation of novel classes of compounds, suggesting a major contribution from biotic processes. From these results we infer that FAs must be perceived as a rather active participant in the global carbon cycle. Molecular-level alterations of such magnitude and rapidity on such short-time scales ought to be considered as widespread in the processing of ''refractory'' DOC in the environment.

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“…in porous media and karst channels (e.g. Seiler et al, 1989;Abelin et al, 1991;Behrens et al, 1997;Ptak, 1997), or in fissured rocks (e.g. Neretnieks et al, 1982;Novakowski et al, 1985;Maloszewski & Zuber, 1993;Himmelsbach et al, 1998;Hoehn et al, 1998;Reimus et al, 1999;Meigs et al, 2001;Sanford et al, 2002, Witthüser et al, 2003, Mazurek et al, 2003.…”

Section: Introductionmentioning

confidence: 99%

Tracer tests in fractured rocks with a new fluorescent dye—pyrene-1,3,6,8-tetra sulphonic acid (PTS) / Tests de traçage en roches fracturées avec un nouveau produit fluorescent—l'acide pyrène 1.3.6.8 tétra sulfonique (PTS)

Einsiedl

Małoszewski²

2005

Hydrological Sciences Journal

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Hydrodynamic dispersion in karstified limestones and dolomites in the Upper Jurassic of the Franconian Alb, F.R.G.

Cited by 20 publications

References 6 publications

Estimation of denitrification potential in a karst aquifer using the 15N and 18O isotopes of NO 3 −

Estimation of denitrification potential in a karst aquifer using the 15N and 18O isotopes of NO 3 −

Rapid biotic molecular transformation of fulvic acids in a karst aquifer

Tracer tests in fractured rocks with a new fluorescent dye—pyrene-1,3,6,8-tetra sulphonic acid (PTS) / Tests de traçage en roches fracturées avec un nouveau produit fluorescent—l'acide pyrène 1.3.6.8 tétra sulfonique (PTS)

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