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Michael Finkel
University of Tübingen
76Publications
20H-index
1,007Citations
Publications 76
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#1Nicole Bandow (BAM: Bundesanstalt für Materialforschung und -prüfung)H-Index: 5
#2Michael Finkel (University of Tübingen)H-Index: 20
Last.Ute Kalbe (BAM: Bundesanstalt für Materialforschung und -prüfung)H-Index: 10
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Column leaching tests are frequently used and accepted for investigation of release of hazardous substances from solid materials. Independent of differences due to the field of application or national regulations, column tests assume that local equilibrium is established in the experiment which facilitates transfer of results to field conditions. In the process of harmonization and standardization within Europe the question on the influence of flow rate and grain size distribution on the local e...
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#1Michael Finkel (University of Tübingen)H-Index: 20
#2Peter Grathwohl (University of Tübingen)H-Index: 43
Abstract Column leaching tests have become a standard method for assessing leaching of pollutants from materials used, e.g., for road and railway constructions and in landscaping measures. Column tests showed to be practical in laboratories yielding robust and reproducible results. However, considerable uncertainty still exists related particularly to the degree of equilibration of the pore water with the solids during preparation (pre-equilibration) and percolation of the column. We analyse equ...
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#1Michael FinkelH-Index: 20
#2Peter GrathwohlH-Index: 43
Last.Olaf A. CirpkaH-Index: 48
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We present a semi-analytical model for the transport of solutes being subject to sorption in porous aquifers. We couple a travel-time based model of advective transport with a spherical diffusion model of kinetic sorption in non-uniform material mixtures. The model is formulated in the Laplace domain and transformed to the time domain by numerical inversion. By this, three-dimensional transport of solutes undergoing mass transfer between aqueous and solid phases can be simulated very efficiently...
5 CitationsSource
#1Michael FinkelH-Index: 20
#2Peter GrathwohlH-Index: 43
Last.Olaf A. CirpkaH-Index: 48
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Source
#1Alicia Sanz-Prat (University of Tübingen)H-Index: 3
#2Chuanhe Lu (University of Tübingen)H-Index: 3
Last.Olaf A. Cirpka (University of Tübingen)H-Index: 48
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Transport of reactive solutes in groundwater is affected by physical and chemical heterogeneity of the porous medium, leading to complex spatio-temporal patterns of concentrations and reaction rates. For certain cases of bioreactive transport, it could be shown that the concentrations of reactive constituents in multi-dimensional domains are approximately aligned with isochrones, that is, lines of identical travel time, provided that the chemical properties of the matrix are uniform. We extend t...
16 CitationsSource
#1Alicia Sanz-Prat (University of Tübingen)H-Index: 3
#2Chuanhe Lu (University of Tübingen)H-Index: 3
Last.Olaf A. Cirpka (University of Tübingen)H-Index: 48
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In travel-time models, the spatially explicit description of reactive transport is replaced by associating reactive-species concentrations with the travel time or groundwater age at all locations. These models have been shown adequate for reactive transport in river-bank filtration under steady-state flow conditions. Dynamic hydrological conditions, however, can lead to fluctuations of infiltration velocities, putting the validity of travel-time models into question. In transient flow, the local...
7 CitationsSource
#1Alicia Sanz-Prat (University of Tübingen)H-Index: 3
#2Chuanhe Lu (University of Tübingen)H-Index: 3
Last.Olaf A. Cirpka (University of Tübingen)H-Index: 48
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Abstract Travel-time based models simplify the description of reactive transport by replacing the spatial coordinates with the groundwater travel time, posing a quasi one-dimensional (1-D) problem and potentially rendering the determination of multidimensional parameter fields unnecessary. While the approach is exact for strictly advective transport in steady-state flow if the reactive properties of the porous medium are uniform, its validity is unclear when local-scale mixing affects the reacti...
19 CitationsSource
#2Michael FinkelH-Index: 20
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A site management plan was proposed to control the groundwater contamination at a German metal recovery plant. A model-based assessment and optimization of the proposed strategies was carried out with a numerical groundwater flow model and an innovative model-based optimization technique. The optimization work considerably improved the pumping wells arrangement, allowing a significant reduction of the required number of wells and of their extraction rates, as well as a separated capture of disti...
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#1Janusz KrupanekH-Index: 1
Last.Michael Finkel (University of Tübingen)H-Index: 20
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#1Janusz KrupanekH-Index: 1
#2Mariusz KaliszH-Index: 1
Last.Michael FinkelH-Index: 20
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