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Titolo:
Description of hydrogeologic heterogeneity and evaluation of radionuclide transport at an underground nuclear test
Autore:
Pohlmann, K; Hassan, A; Chapman, J;
Indirizzi:
Univ & Community Coll Syst Nevada, Desert Res Inst, Water Resources Ctr, Las Vegas, NV 89119 USA Univ & Community Coll Syst Nevada Las Vegas NV USA 89119 as, NV 89119 USA
Titolo Testata:
JOURNAL OF CONTAMINANT HYDROLOGY
fascicolo: 3-4, volume: 44, anno: 2000,
pagine: 353 - 386
SICI:
0169-7722(200008)44:3-4<353:DOHHAE>2.0.ZU;2-H
Fonte:
ISI
Lingua:
ENG
Soggetto:
POROUS-MEDIA; SOLUTE TRANSPORT; NUMERICAL-SIMULATION; GROUNDWATER-FLOW; UNCERTAINTY; DISPERSION; AQUIFERS;
Keywords:
groundwater; stochastic methods; radionuclide transport; subsurface heterogeneity;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
48
Recensione:
Indirizzi per estratti:
Indirizzo: Pohlmann, K Univ & Community Coll Syst Nevada, Desert Res Inst, Water Resources Ctr, 755 E Flamingo Rd, Las Vegas, NV 89119 USA Univ & Community CollSyst Nevada 755 E Flamingo Rd Las Vegas NV USA 89119
Citazione:
K. Pohlmann et al., "Description of hydrogeologic heterogeneity and evaluation of radionuclide transport at an underground nuclear test", J CONTAM HY, 44(3-4), 2000, pp. 353-386

Abstract

Realistic models of contaminant transport in groundwater demand detailed characterization of the spatial distribution of subsurface hydraulic properties, while at the same time programmatic constraints may limit collection of pertinent hydraulic data. Fortunately, alternate forms of data can be used to improve characterization of spatial variability. We utilize a methodology that augments sparse hydraulic information (hard data) with more widelyavailable hydrogeologic information to generate equiprobable maps of hydrogeologic properties that incorporate patterns of connected permeable zones. Geophysical and lithologic logs are used to identify hydrogeologic categories and to condition stochastic simulations using Sequential Indicator Simulation (SIS). The resulting maps are populated with hydraulic conductivity values using field data and Sequential Gaussian Simulation (SGS). Maps of subsurface hydrogeologic heterogeneity are generated for the purpose of examining groundwater flow and transport processes at the Faultless undergroundnuclear test, Central Nevada Test Area (CNTA), through large-scale, three-dimensional numerical modeling. The maps provide the basis for simulation of groundwater flow, while transport of radionuclides from the nuclear cavity is modeled using particle tracking methods. Sensitivity analyses focus onmodel parameters that are most likely to reduce the long travel times observed in the base case. The methods employed in this study have improved ourunderstanding of the spatial distribution of preferential flowpaths at this site and provided the critical foundation on which to build models of groundwater flow and transport. The results emphasize that the impacts of uncertainty in hydraulic and chemical parameters are dependent on the radioactive decay of specific species, with rapid decay magnifying the effects of parameters that change travel time. (C) 2000 Elsevier Science B.V. All rightsreserved.

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Documento generato il 10/07/20 alle ore 18:42:36