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000907621 1001_ $$00000-0003-0741-249X$$aSoler, J. M.$$b0$$eCorresponding author
000907621 245__ $$aPredictive Modeling of a Simple Field Matrix Diffusion Experiment Addressing Radionuclide Transport in Fractured Rock. Is It So Straightforward?
000907621 260__ $$c2022
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000907621 520__ $$aThe SKB GroundWater Flow and Transport of Solutes Task Force is an international forum in the area of conceptual and numerical modeling of groundwater flow and solute transport in fractured rocksrelevant for the deep geological disposal of radioactive waste. Two in situ matrix diffusion experiments in crystalline rock (gneiss) were performed at POSIVA’s ONKALO underground facility in Finland. Syntheticgroundwater containing several conservative and sorbing radiotracers was injected at one end of a borehole interval and flowed along a thin annulus toward the opposite end. Several teams performed predictivemodeling of the tracer breakthrough curves using “conventional” modeling approaches (constant diffusion and sorption in the rock, no or minimum rock heterogeneity). Supporting information, derived from small-scalelaboratory experiments, was provided. The teams were free to implement different concepts, use different codes, and apply the transport and retention parameters that they considered to be most suited (i.e., not a benchmark exercise). The main goal was the comparison of the different sets of results and the analysis of the possible differences for this relatively simple experimental setup with a well-defined geometry. Even though theexperiment was designed to study matrix diffusion, the calculated peaks of the breakthrough curves were very sensitive to the assumed magnitude of dispersion in the borehole annulus. However, given the verydifferent timescales for advection and matrix diffusion, the tails of the curves provided information concerning diffusion and retention in the rock matrix regardless of the magnitude of dispersion. In addition, although the task was designed to be a blind modeling exercise, the model results have also been compared to the measured experimental breakthroughs. Experimental results tend to show relatively small activities, wide breakthroughs,and early first arrivals, which are somewhat similar to model results using large dispersivity values.
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000907621 7001_ $$00000-0001-5033-4365$$aNeretnieks, I.$$b1
000907621 7001_ $$00000-0001-8241-2225$$aMoreno, L.$$b2
000907621 7001_ $$0P:(DE-HGF)0$$aLiu, L.$$b3
000907621 7001_ $$0P:(DE-HGF)0$$aMeng, S.$$b4
000907621 7001_ $$0P:(DE-HGF)0$$aSvensson, U.$$b5
000907621 7001_ $$0P:(DE-HGF)0$$aIraola, A.$$b6
000907621 7001_ $$0P:(DE-HGF)0$$aEbrahimi, H.$$b7
000907621 7001_ $$00000-0003-1351-2788$$aTrinchero, P.$$b8
000907621 7001_ $$0P:(DE-HGF)0$$aMolinero, J.$$b9
000907621 7001_ $$0P:(DE-HGF)0$$aVidstrand, P.$$b10
000907621 7001_ $$0P:(DE-Juel1)156511$$aDeissmann, G.$$b11
000907621 7001_ $$0P:(DE-HGF)0$$aŘíha, J.$$b12
000907621 7001_ $$00000-0003-3793-3341$$aHokr, M.$$b13
000907621 7001_ $$00000-0001-7443-431X$$aVetešník, A.$$b14
000907621 7001_ $$00000-0001-9659-5317$$aVopálka, D.$$b15
000907621 7001_ $$0P:(DE-HGF)0$$aGvoždík, L.$$b16
000907621 7001_ $$0P:(DE-HGF)0$$aPolák, M.$$b17
000907621 7001_ $$0P:(DE-HGF)0$$aTrpkošová, D.$$b18
000907621 7001_ $$00000-0003-0424-3862$$aHavlová, V.$$b19
000907621 7001_ $$0P:(DE-HGF)0$$aPark, D.-K.$$b20
000907621 7001_ $$00000-0002-2506-4049$$aJi, S.-H.$$b21
000907621 7001_ $$00000-0001-7224-2103$$aTachi, Y.$$b22
000907621 7001_ $$0P:(DE-HGF)0$$aIto, T.$$b23
000907621 7001_ $$00000-0002-2464-6725$$aGylling, B.$$b24
000907621 7001_ $$00000-0002-1169-4170$$aLanyon, G. W.$$b25
000907621 773__ $$0PERI:(DE-600)2132500-5$$a10.1080/00295450.2021.1988822$$gVol. 208, no. 6, p. 1059 - 1073$$n6$$p1059 - 1073$$tNuclear technology$$v208$$x0029-5450$$y2022
000907621 8564_ $$uhttps://juser.fz-juelich.de/record/907621/files/Soler%20et%20al.%20rev.pdf$$yPublished on 2021-12-09. Available in OpenAccess from 2022-12-09.
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