Bjerg, Poul Løgstrup

Brauns, Bentje

Broholm, Mette Martina

Kerrn-Jespersen, Henriette

Mosthaf, Klaus

Rohde, Magnus Marius

Online Research Database In Technology

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Downloaded from orbit.dtu.dk on: Dec 20, 2017A pumping and tracer test in a limestone aquifer and impacts on contaminated site riskassessment and managementMosthaf, Klaus; Brauns, Bentje; Broholm, Mette Martina; Rohde, Magnus Marius; Kerrn-Jespersen,Henriette; Bjerg, Poul LøgstrupPublication date:2017Document VersionEarly version, also known as pre-printLink back to DTU OrbitCitation (APA):Mosthaf, K., Brauns, B., Broholm, M. M., Rohde, M. M., Kerrn-Jespersen, H., & Bjerg, P. L. (2017). A pumpingand tracer test in a limestone aquifer and impacts on contaminated site risk assessment and management.Abstract from ATV jord og grundvand 2017: vintermøde, Vejle, Denmark.                                                1  Forslag til vintermøde / temadag 2017  Deadline: 15. september 2016     (sendes som word-fil (ikke pdf) til atvlv@env.dtu.dk)                                                                                                                 Jeg har forslag til  (sæt kryds)  __ Temadag 2017, 6. marts      (heldagsmøde om et givent emne – her bedes du også indikere en skitse til et program)  _x_ Et indlæg jeg gerne vil holde på Vintermødet 2017, 7. – 8. marts      (et 20 min. indlæg som en del af det samlede program)  __ En fagsession jeg gerne vil arrangere på Vintermødet 2017, 7. - 8. marts (flere sammenhængende indlæg om et specialiseret emne – her bedes du endvidere in-dikere en programskitse)  __ En workshop jeg gerne vil arrangere på Vintermødet 2017, 7. – 8. marts (korte oplæg – aktiv deltagelse af deltagerne – her bedes du endvidere indikere en        programskitse)  __ Forslag om andre foredragsholdere eller emner til sessioner  Titel på indlæg     Pumpe og tracer forsøg i et kalkmagasin, og betydning for risikovurdering og for-valtning af forurenede grunde  (Foredraget holdes på Dansk)  A pump and tracer test in a limestone aquifer, and implications for contaminated site risk assessment and management  Navn og titel på foredrags-holder  Klaus Mosthaf, Postdoc.   Arbejdssted  DTU Environment  Adresse DTU Miljø Bygningstorvet Bygning 115 2800 Kgs. Lyngby   E-mail pjbi@env.dtu.dk  Telefon  Navn og titel på evt. med-forslagsstiller(e) (deltager til fuld pris) Klaus Mosthaf, Postdoc, DTU Environment Bentje Brauns, Postdoc, DTU Environment Mette Broholm, Lektor, DTU Environment Magnus Marius Rohde, Project Manager, GEO  Henriette Kerrn-Jespersen, Specialkonsulent, Civil Ingeniør, Region H Poul Bjerg, Professor, DTU Environment Målgruppe Hvem er den primære målgruppe? Contaminated site case officers at the Regions, consultants, academics, kommunes (pump test)                                                                                                                                                                       /fortsættes                                                  2    Titel på indlæg (gentages fra side 1) A pumping and tracer test in a limestone aquifer and impacts on contami-nated site risk assessment and management Pumpe og tracer forsøg i et kalkmagasin, og betydning for risikovurdering og for-valtning af forurenede grunde Baggrund / indledning  Region H has worked with DTU Environment for 3 years on a project to improve our understanding and practical management of contaminant transport in lime-stone aquifers. The project includes an extensive field campaign, and makes exten-sive use of models for conceptual understanding, experimental design, and for in-terpretation of results.   Formål Hvad er formålet? Hvorfor er det relevant for tilhørerne?  Hvad kan vi lære?  To conduct a field pump and tracer test at a contaminated site at Akacievej, Hede-husene in order to improve our understanding and practical management of con-taminant transport in fractured limestone aquifers. Metoder og datagrundlag F.eks. laboratorie-, pilot- og/el- ler feltundersøgelser eller mo-dellering samt antal analyser, boringer, transekter, offentlige administrative aspekter, erfa-ringsopsamling mv.   A hydraulic pump test was conducted with a simultaneous tracer test (Figure 1). Before the pump test, the geology was carefully mapped using borehole cores, ge-ophysics etc. The pump test was conducted over several weeks, with head obser-vations being collected at a set of observation wells at different depths in the aqui-fer. Different tracers were injected at several observation wells and monitored at the pumping well. The experiment was designed and results interpreted using a 3D fracture transport model.  Resultater Hvad er interessant? Hvilke sammenhænge ses? Hvordan passer det med det forventede? Osv.  The pump and geologic investigations test showed that limestone aquifers are very permeable, with fracture flow dominating the hydraulic response. The tracer test showed very fast (minutes) breakthrough, suggesting a very high degree of con-nectivity between wells. Significant tailing showed that limestone matrix diffusion is important for interpretation of results. When tracers are injected for a period be-fore pumping, they diffuse more into the matrix, resulting in lower breakthrough concentrations and longer tailing of concentrations. Deeper wells and crushed up-per layers have lower permeability and show slower breakthroughs.    Konklusion Vigtigste læringer – her oplistes de punkter, som du mener, at tilhørerne kan lære noget af – altså ”take home messages”  A pump test and tracer test was conducted and allowed for new and improved un-derstanding of limestone aquifers:  Analyses of contaminant transport in limestone aquifers must consider fast transport pathways in fractures and exchange of contaminants between the limestone fractures and matrix. Limestone aquifers cannot be considered to be porous media.   Well capture zones are very hard to map in such aquifers.   Remediation of limestone aquifers will be difficult because it is hard to remove contaminants from the limestone matrix.   While tracer tests show extremely fast breakthrough of contaminants, plume speeds are much slower because of contaminant migration into the limestone matrix when contaminants are present in aquifers for longer times.  These factors are incorporated in an improved risk assessment for the site.  Tidshorisont Evt. igangværende projekt-re-sultater og konklusioner skal foreligge inden Vintermødet 2017  The pump and tracer test was concluded in the spring of 2016. Model interpretation was completed in the fall of 2016.                                                 3  Andre bemærkninger      Foredraget holdes på dansk.  Indlægget kan med fordel kobles sammen med den indsendt af Annika S. Fjord-bøge: Dynamisk udvikling i fordelingen af opløst PCE i sprækket kalkmagasin ved ændrede pumpningsforhold og udvikling af konceptuel model   Illustration Indsæt gerne illustrerende fi-gur, som viser resultater, pro-ces eller lignende, som side 3        Conceptual modelNumerical modelData collection and field workFigure 1. Integrated field and modelling approach to conducing a pump and tracer test at Akacievej, Hede-husene 

A pumping and tracer test in a limestone aquifer and impacts on contaminated site risk assessment and management

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A pumping and tracer test in a limestone aquifer and impacts on contaminated site risk assessment and management

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