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Evaluation of methods for monitoring...

Roll, Laura Lynn.

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Evaluation of methods for monitoring natural attenuation.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Evaluation of methods for monitoring natural attenuation./
Author:	Roll, Laura Lynn.
Description:	198 p.
Notes:	Source: Masters Abstracts International, Volume: 48-06, page: 3576.
Contained By:	Masters Abstracts International48-06.
Subject:	Geology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1477121
ISBN:	9781124026534

Evaluation of methods for monitoring natural attenuation.
Roll, Laura Lynn.

Evaluation of methods for monitoring natural attenuation. - 198 p.

Source: Masters Abstracts International, Volume: 48-06, page: 3576.

Thesis (M.S.)--University of California, Davis, 2010.

The use of monitored natural attenuation as a remediation strategy can reduce costs over active remediation. Current monitoring approaches need to be critically evaluated though, in the context of application to typical field settings, such as heterogeneous alluvial aquifer systems. Spatially varying aquifer properties create non uniform flow fields and greatly influence transport processes, producing complex plume behavior which can confound monitoring results. Highly-resolved simulations of flow and conservative transport in an alluvial aquifer system at the Lawrence Livermore National Laboratory (LLNL) site facilitate a critical review of two monitoring approaches including estimation of mass balance from sampling along the plume centerline and estimation of mass flux from sampling along cross sections. The simulation procedure involves generation of quasi-unconditional transition-probability fields of hydrofacies distributions at the LLNL site, simulation of steady state flow followed by simulation of conservative transport using a highly accurate random walk particle method. The results elucidate limitations and potential pitfalls of the monitoring methods in typically heterogeneous systems. For example, simulations show that because of the system complexity, apparent concentration trends in space and time can easily be falsely attributed to biodegradation when none is occurring. Relying on measured concentrations alone as a means to judge effectiveness of in situ degradation are suspect however, and additional methods should be used to support definitive conclusions regarding remediation objectives.

ISBN: 9781124026534Subjects--Topical Terms:

516570
Geology.

Evaluation of methods for monitoring natural attenuation.
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035 $a (UMI)AAI1477121
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100 1 $a Roll, Laura Lynn. $3 1672931
245 1 0 $a Evaluation of methods for monitoring natural attenuation.
300 $a 198 p.
500 $a Source: Masters Abstracts International, Volume: 48-06, page: 3576.
500 $a Adviser: Graham E. Fogg.
502 $a Thesis (M.S.)--University of California, Davis, 2010.
520 $a The use of monitored natural attenuation as a remediation strategy can reduce costs over active remediation. Current monitoring approaches need to be critically evaluated though, in the context of application to typical field settings, such as heterogeneous alluvial aquifer systems. Spatially varying aquifer properties create non uniform flow fields and greatly influence transport processes, producing complex plume behavior which can confound monitoring results. Highly-resolved simulations of flow and conservative transport in an alluvial aquifer system at the Lawrence Livermore National Laboratory (LLNL) site facilitate a critical review of two monitoring approaches including estimation of mass balance from sampling along the plume centerline and estimation of mass flux from sampling along cross sections. The simulation procedure involves generation of quasi-unconditional transition-probability fields of hydrofacies distributions at the LLNL site, simulation of steady state flow followed by simulation of conservative transport using a highly accurate random walk particle method. The results elucidate limitations and potential pitfalls of the monitoring methods in typically heterogeneous systems. For example, simulations show that because of the system complexity, apparent concentration trends in space and time can easily be falsely attributed to biodegradation when none is occurring. Relying on measured concentrations alone as a means to judge effectiveness of in situ degradation are suspect however, and additional methods should be used to support definitive conclusions regarding remediation objectives.
590 $a School code: 0029.
650 4 $a Geology. $3 516570
650 4 $a Hydrology. $3 545716
650 4 $a Environmental Sciences. $3 676987
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710 2 $a University of California, Davis. $b Hydrologic Sciences. $3 1672932
773 0 $t Masters Abstracts International $g 48-06.
790 1 0 $a Fogg, Graham E., $e advisor
790 1 0 $a LaBolle, Eric M. $e committee member
790 1 0 $a Ginn, Timothy R. $e committee member
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791 $a M.S.
792 $a 2010
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1477121