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North-Central Section - 38th Annual Meeting (April 1–2, 2004)<=
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<td colspan=3D2 style=3D'background:white;padding:0in 0in 2.0pt 0in'>
<p class=3DMsoNormal><span style=3D'font-size:9.0pt;font-family:Arial'>No=
rth-Central
Section - 38th Annual Meeting (April 1–2, 2004)<o:p></o:p></span></=
p>
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<td style=3D'background:#B3C5A3;padding:0in 0in 0in 5.0pt'>
<p class=3DMsoNormal><b>Paper No. 16-15<o:p></o:p></b></p>
</td>
<td style=3D'background:#B3C5A3;padding:0in 0in 0in 5.0pt'><!-- <a href=
=3D"../MAIN.htm"><img src=3D"../images/mainmenulink.gif" alt=3D"Main Menu" =
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sp;</o:p></b></p>
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<p class=3DMsoNormal><b><span style=3D'font-size:9.0pt;font-family:Arial;
color:#4A752B'>Presentation Time:</span></b><span style=3D'font-size:9.0p=
t;
font-family:Arial;color:#4A752B'> 8:00 AM-12:00 PM<o:p></o:p></span></p>
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<td style=3D'background:white;padding:3.75pt 3.75pt 3.75pt 3.75pt'>
<p class=3DMsoNormal><span style=3D'font-family:Arial'><o:p> </o:p><=
/span></p>
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<!--abstract-->
<tr style=3D'mso-yfti-irow:2'>
<td colspan=3D3 style=3D'background:white;padding:3.75pt 3.75pt 3.75pt 3.=
75pt'><!--InterestPaper71563-->
<h2 style=3D'margin-bottom:0in;margin-bottom:.0001pt'><span style=3D'font=
-size:
14.0pt'>QUANTIFICATION AND ISOLATION OF THE BAROMETRIC INFLUENCE ON
GROUND-WATER LEVELS IN THE PENNSYLVANIAN INGLEFIELD SANDSTONE, <st1:place
w:st=3D"on">SOUTHWESTERN INDIANA</st1:place><o:p></o:p></span></h2>
</td>
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<!--/abstract-->
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<td style=3D'background:white;padding:3.75pt 3.75pt 3.75pt 3.75pt'><!--ab=
stract-->
<p class=3DMsoNormal><b><span style=3D'font-family:Arial'><a
href=3D"mailto:pdoss@usi.edu">BROWN, Robert</a></span></b><span
style=3D'font-family:Arial'>, INKENBRANDT, Paul, and DOSS, Paul K., Geolo=
gy, <span
class=3DSpellE>Univ</span> of Southern Indiana, 8600 University Blvd,
Evansville, IN 47712, pdoss@usi.edu <o:p></o:p></span></p>
<p><span style=3D'font-family:Arial'>Ground-water levels measured in the
Pennsylvanian Inglefield Sandstone of southwestern <st1:State w:st=3D"on"=
><st1:place
w:st=3D"on">Indiana</st1:place></st1:State> display responses to loading=
by
atmospheric pressure changes. The remarkable inverse relation between
barometric pressure change and water level change <span class=3DGramE>is
recorded</span> in both deep and shallow piezometers (each with ten foot
screened intervals) in the Ground-Water Monitoring Laboratory on the <st1=
:place
w:st=3D"on"><st1:PlaceType w:st=3D"on">University</st1:PlaceType> of <st1=
:PlaceName
w:st=3D"on">Southern Indiana</st1:PlaceName></st1:place> campus. The
calculated barometric efficiency of this sandstone unit is between 0.85 a=
nd
0.93, suggesting a very rigid aquifer skeleton. Although barometric respo=
nses
<span class=3DGramE>must be quantified and successfully removed to evalua=
te
actual potential (water level) changes in an aquifer,</span> the recognit=
ion
and interpretation of barometric responses can aid in evaluating <span
class=3DSpellE>hydrostratigraphy</span> and aquifer properties. <o:p></o:=
p></span></p>
<p><span style=3D'font-family:Arial'>Continuous water level and barometric
pressure measurements permitted the quantification, isolation, and remova=
l of
barometric responses from piezometer hydrographs. After removal of the
barometric influence, additional, smaller scale sinusoidal fluctuations in
water levels <span class=3DGramE>are observed</span> that may represent E=
arth
tide responses. Further analyses are required to interpret these
fluctuations. <o:p></o:p></span></p>
<p><span style=3D'font-family:Arial'>The rapid and constant barometric re=
sponse
functions in these piezometers are diagnostic of a confined system,
suggesting that the Inglefield Sandstone is a confined aquifer in this ar=
ea.
Whereas the <span class=3DSpellE>micritic</span> West Franklin Limestone =
forms
a basal confining layer, stratigraphic observations do not indicate the
presence of an obvious upper confining layer. Heterogeneity within the
Inglefield Sandstone, in particular a fine-grained <span class=3DSpellE>f=
acies</span>
with oriented mica grains likely serves as an upper confining layer. <o:p=
></o:p></span><!--Abstract 71563 modified by 192.206.9.72 on 1-6-2004--></p>
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<p class=3DMsoNormal><span style=3D'font-family:Arial'><a
href=3D"http://gsa.confex.com/gsa/2004NC/finalprogram/index.html">North-C=
entral
Section - 38th Annual Meeting (April 1–2, 2004)</a> <o:p></o:p></sp=
an></p>
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info-->
<p class=3DMsoNormal><span style=3D'font-family:Arial;color:#4A752B'>Sess=
ion No.
16--Booth# 15<br>
<a href=3D"http://gsa.confex.com/gsa/2004NC/finalprogram/session_13273.ht=
m">Undergraduate
Research in the Geosciences II (Posters)</a><br>
Millennium Hotel St. Louis: Missouri Ballroom<br>
8:00 AM-12:00 PM, Friday, 2 April 2004<br>
<br>
Geological Society of America <i>Abstracts with Programs</i>, Vol. 36, No=
. 3,
p. 43<o:p></o:p></span></p>
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<p class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:Arial;
color:#666666'>© Copyright 2004 The Geological Society of <st1:count=
ry-region
w:st=3D"on"><st1:place w:st=3D"on">America</st1:place></st1:country-regio=
n>
(GSA), all rights reserved. Permission <span class=3DGramE>is hereby gran=
ted</span>
to the author(s) of this abstract to reproduce and distribute it freely, =
for
noncommercial purposes. Permission is hereby granted to any individual
scientist to download a single copy of this electronic file and reproduce=
up to
20 paper copies for noncommercial purposes advancing science and <span
class=3DGramE>education, including classroom use, providing all reproduct=
ions
include</span> the complete content shown here, including the author
information. All other forms of reproduction and/or transmittal <span
class=3DGramE>are prohibited</span> without written permission from GSA
Copyright Permissions. <o:p></o:p></span></p>
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