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Comparative application and optimization of different single-borehole dilution test techniques

Fahrmeier, Nikolai; Goeppert, Nadine; Goldscheider, Nico

Abstract (englisch):
Single-borehole dilution tests (SBDTs) are a method for characterizing groundwater monitoring wells and boreholes, and are based on the injection of a tracer into the saturated zone and the observation of concentration over depth and time. SBDTs are applicable in all aquifer types, but especially interesting in heterogeneous karst or fractured aquifers. Uniform injections aim at a homogeneous tracer concentration throughout the entire saturated length and provide information about inflow and outflow horizons. Also, in the absence of vertical flow, horizontal filtration velocities can be calculated. The most common method for uniform injections uses a hosepipe to inject the tracer. This report introduces a simplified method that uses a permeable injection bag (PIB) to achieve a close-to-uniform tracer distribution within the saturated zone. To evaluate the new method and to identify advantages and disadvantages, several tests have been carried out, in the laboratory and in multiple groundwater monitoring wells in the field. Reproducibility of the PIB method was assessed through repeated tests, on the basis of the temporal development of salt amount and calculated apparent filtration velocities. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000128599
Veröffentlicht am 18.01.2021
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Geowissenschaften (AGW)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 1431-2174, 1435-0157
KITopen-ID: 1000128599
Erschienen in Hydrogeology journal
Verlag Springer
Band 29
Heft 1
Seiten 199-211
Vorab online veröffentlicht am 05.12.2020
Schlagwörter Groundwater flow, Karst, Borehole techniques, Dilution test, Single-well method
Nachgewiesen in Dimensions
Web of Science
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