Document Detail

Monitoring groundwater contamination and delineating source zones at industrial sites: uncertainty analyses using integral pumping tests.
MedLine Citation:
PMID:  16085336     Owner:  NLM     Status:  MEDLINE    
Field-scale characterisations of contaminant plumes in groundwater, as well as source zone delineations, are associated with uncertainties that can be considerable. A major source of uncertainty in environmental datasets is due to variability of sampling results, as a direct consequence of the heterogeneity of environmental matrices. We develop a methodology for quantifying uncertainties in field-scale mass flow and average concentration estimations, using integral pumping tests (IPTs), where the contaminant concentration is measured as a function of time in a pumping well. This procedure increases the sampling volume and reduces the effect of small-scale variability that may bias point-scale measurements. In particular, using IPTs, the interpolation uncertainty of conventional point-scale measurements is transformed to a quantifiable uncertainty related to the (unknown) plume position relative to the pumping well. We show that this plume position uncertainty generally influenced the predicted mass flows and average concentrations (of acenapthene, benzene and CHCs) to a greater extent than a boundary condition uncertainty related to the local water balance, considering 19 control planes at a highly heterogeneous industrial site in southwest Germany. Furthermore, large (order of magnitude) uncertainties only occurred if the conditions were strongly heterogeneous in the nearest vicinity of the well. We also develop a consistent methodology for an assessment of the combined effect of uncertainty in hydraulic conditions and uncertainty in reactive transport parameters for delimiting of both contaminant source zones and zones absent of source, based on (downgradient) IPTs.
Jerker Jarsjö; Martí Bayer-Raich; Thomas Ptak
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Publication Detail:
Type:  Journal Article     Date:  2005-08-08
Journal Detail:
Title:  Journal of contaminant hydrology     Volume:  79     ISSN:  0169-7722     ISO Abbreviation:  J. Contam. Hydrol.     Publication Date:  2005 Oct 
Date Detail:
Created Date:  2005-10-06     Completed Date:  2006-02-07     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8805644     Medline TA:  J Contam Hydrol     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  107-34     Citation Subset:  IM    
Centre for Applied Geosciences (ZAG), University of Tübingen, Germany.
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MeSH Terms
Benzene / analysis
Environmental Monitoring / methods*
Industrial Waste*
Polycyclic Hydrocarbons, Aromatic / analysis
Risk Assessment
Rivers / chemistry
Water Pollutants, Chemical / analysis*
Water Supply / analysis*
Reg. No./Substance:
0/Industrial Waste; 0/Polycyclic Hydrocarbons, Aromatic; 0/Water Pollutants, Chemical; 71-43-2/Benzene

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