Numerical simulation of ground-water flow and advective transport at Woburn, Massachusetts, based on a sedimentological model of glacial and glaciofluvial deposition

Bibliographic Details
Main Author:	Metheny, Maura Agnew
Language:	English
Published:	The Ohio State University / OhioLINK 1998
Subjects:	bedrock overcompacted Aberjona groundwater Hydraulic Conductivity Aberjona River
Online Access:	http://rave.ohiolink.edu/etdc/view?acc_num=osu1144696163

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spelling	ndltd-OhioLink-oai-etd.ohiolink.edu-osu11446961632021-08-03T05:50:47Z Numerical simulation of ground-water flow and advective transport at Woburn, Massachusetts, based on a sedimentological model of glacial and glaciofluvial deposition Metheny, Maura Agnew bedrock overcompacted Aberjona groundwater Hydraulic Conductivity Aberjona River <p>The purpose of this study is 1) to describe the geologic framework of east Woburn, Massachusetts, in a regional and local context, 2) to use the available data to reconstruct the geometry of deposits in the buried glacial valley, 3) to create a numerical groundwater flow model that incorporates the geology with correlated values of hydraulic properties, and 4) to use the numerical groundwater flow model to predict particle pathlines and traveltimes for different pumping conditions using transient and steady- state simulations.</p> <p>The Aberjona River flows through the buried glacial valley of east Woburn Massachusetts, the location of the U.S. EPA Wells G and H Superfund-site. The bedrock is composed of fractured, metamorphosed, igneous, rocks of the Precambrian, Avalon terrane. Glacial, glaciofluvial, and fluvial silts, sands, and gravels partially fill the valley. Approximately 14,000 y.b.p, glacial ice left a discontinuous mantle of overcompacted tills up to 40-feet thick on the valley uplands and up to 64-feet thick on the valley walls and valley floor. Subsequent glaciofluvial meltwaters deposited looser sands, silts, and gravels up to 120-feet thick within the valley. During deglaciation, blocks of glacial ice created lakes, where silts and clays were deposited, trapped kame deposits, and after melting, left kettle holes where silts accumulated. Nine cross sections, based on over 290 borings, show the subsurface distribution of these materials.</p> <p>Hydraulic properties of the materials were based on grain-size analyses, slug tests, aquifer tests and permeameter tests obtained from U.S. EPA documents. These hydraulic properties are correlated to the sedimentologic facies identified on the cross sections. A six-layer groundwater model was constructed using the distribution of these hydraulic properties. The groundwater model simulates groundwater flowing from upland areas into the Aberjona River wetland, where municipals well G and H and other industrial wells are located. The model was calibrated using steady-state and transient water levels and streamflow data measured when municipal wells G and H were pumped during a 30-day aquifer test in December, 1985 and January, 1986.</p> <p>Particle pathline analysis shows that advective traveltimes from W.R. Grace to the wellfield are between 5.1 and 9.5, years assuming steady-state pumping at wells G and H, but are between 7.8 and 16.7 years when using historic pumping rates and schedules. Advective traveltimes from Wildwood to the wellfield are between 0.5 and 1 .1 years assuming steady-state pumping at wells G and H. Assuming steady-state pumping at wells G and H, advective traveltimes from UniFirst, Olympia, and NEP to the wellfield are 4.3, 1.6, and 0.6 years, respectively. The groundwater flow model is used to compute induced infiltration from the Aberjona River when wells G and H are pumped. Under historic pumping rates and schedules, the rate of induced infiltration varies in direct proportion to the rate of pumping and is as much as 588 gpm along the river's reach between Olympia Avenue and Salem Street. The transient simulation shows that stress applied to the groundwater flow system during the 30-day pumping test in 1985 and 1986 was exceeded only three times during the 16 years that wells G and H were operated.</p> 1998 English text The Ohio State University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=osu1144696163 http://rave.ohiolink.edu/etdc/view?acc_num=osu1144696163 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.
collection	NDLTD
language	English
sources	NDLTD
topic	bedrock overcompacted Aberjona groundwater Hydraulic Conductivity Aberjona River
spellingShingle	bedrock overcompacted Aberjona groundwater Hydraulic Conductivity Aberjona River Metheny, Maura Agnew Numerical simulation of ground-water flow and advective transport at Woburn, Massachusetts, based on a sedimentological model of glacial and glaciofluvial deposition
author	Metheny, Maura Agnew
author_facet	Metheny, Maura Agnew
author_sort	Metheny, Maura Agnew
title	Numerical simulation of ground-water flow and advective transport at Woburn, Massachusetts, based on a sedimentological model of glacial and glaciofluvial deposition
title_short	Numerical simulation of ground-water flow and advective transport at Woburn, Massachusetts, based on a sedimentological model of glacial and glaciofluvial deposition
title_full	Numerical simulation of ground-water flow and advective transport at Woburn, Massachusetts, based on a sedimentological model of glacial and glaciofluvial deposition
title_fullStr	Numerical simulation of ground-water flow and advective transport at Woburn, Massachusetts, based on a sedimentological model of glacial and glaciofluvial deposition
title_full_unstemmed	Numerical simulation of ground-water flow and advective transport at Woburn, Massachusetts, based on a sedimentological model of glacial and glaciofluvial deposition
title_sort	numerical simulation of ground-water flow and advective transport at woburn, massachusetts, based on a sedimentological model of glacial and glaciofluvial deposition
publisher	The Ohio State University / OhioLINK
publishDate	1998
url	http://rave.ohiolink.edu/etdc/view?acc_num=osu1144696163
work_keys_str_mv	AT methenymauraagnew numericalsimulationofgroundwaterflowandadvectivetransportatwoburnmassachusettsbasedonasedimentologicalmodelofglacialandglaciofluvialdeposition
_version_	1719426492908175360

Numerical simulation of ground-water flow and advective transport at Woburn, Massachusetts, based on a sedimentological model of glacial and glaciofluvial deposition

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