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<p class="MsoNormal" style="margin:0in;line-height:normal;font-size:11pt;font-family:"Calibri",sans-serif"><span>Hello all,<span></span></span></p>
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<p class="MsoNormal" style="margin:0in;line-height:normal;font-size:11pt;font-family:"Calibri",sans-serif"><span>Next Monday (11/15) Dr. John Nimmo from USGS
will present about unsaturated zone preferential flow. Please join us between
12-1 pm (pacific) via zoom. <span></span></span></p>
<p class="MsoNormal" style="margin:0in;line-height:normal;font-size:11pt;font-family:"Calibri",sans-serif"><span><span> </span></span></p>
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<p class="MsoNormal" style="margin:0in 0in 8pt;line-height:107%;font-size:11pt;font-family:"Calibri",sans-serif"><span>Title: <span style="color:black">Unsaturated zone preferential
flow-Unexpected effects for ecosystems and hazardous-waste containment<span></span></span></span></p>
<p class="MsoNormal" style="margin:0in 0in 8pt;line-height:107%;font-size:11pt;font-family:"Calibri",sans-serif"><span>Abstract: Preferential flow along common subsurface paths such as
wormholes and fractures moves water through the unsaturated zone faster and
more directly than diffuse or capillary flow through the bulk of soil matrix
material. In ecosystems preferential flow is vital for the efficient
distribution of water through the root zone for the optimal use of plants.
Field experiments in a restored tropical dryland forest in Hawaii demonstrate
that the plants themselves, through their ordinary growth and decay processes,
can modify the soil over several years to enhance the preferential flow that is
beneficial to them. At near-surface hazardous waste sites, minimization of
preferential flow is important for contaminant containment. Field experiments
at a simulated waste trench in Idaho show that common landfill construction
practices can effectively destroy macropore preferential flowpaths, though
additional effects such as destruction of flow-inhibiting natural layer
boundaries may offset the beneficial effects of macropore destruction. Ongoing
research on the processes of preferential flow has produced significant
insights in recent decades. A major current need is for predictive methods to
incorporate the improved understanding that has been achieved.<span> <br></span></span></p><img src="cid:ii_kvu9pfvs1" alt="John Nimmo.png" style="margin-right: 0px;" width="180" height="180"><br><br>
<p style="margin:0in;line-height:11.75pt;background:white none repeat scroll 0% 0%;font-size:12pt;font-family:"Times New Roman",serif"><span style="font-size:11pt;font-family:"Calibri",sans-serif;color:rgb(32,31,30)">Bio: John Nimmo is active
in Unsaturated Flow Research in Menlo Park, California, USA. He also is
Research Physicist Emeritus with the U.S. Geological Survey, having been
actively employed at the USGS from 1981 to 2020. During most of his USGS
career, he was Chief of the Unsaturated Flow Processes Project. His research
primarily pursues process understanding and estimation methods for fundamental
unsaturated-zone flow processes, with particular emphasis on preferential flow.
This work is directed toward applications in water-resource assessment,
subsurface contaminant fluxes and vulnerabilities, and soil-water dynamics of
natural and altered ecosystems. He pursues these largely through mathematical
modeling and development of theory, and additionally in collaborations
involving field and lab experiments. He writes review articles and basic
reference materials that draw on his knowledge and experience gained during
more than four decades of research on unsaturated flow </span><span style="font-size:11pt;font-family:"Calibri",sans-serif;color:black">(</span><span style="color:black"><a href="mailto:jrnimmo@usgs.gov" target="_blank" style="color:rgb(5,99,193);text-decoration:underline"><span style="font-size:11pt;font-family:"Calibri",sans-serif">jrnimmo@usgs.gov</span></a></span><span style="font-size:11pt;font-family:"Calibri",sans-serif;color:black">)</span><span style="font-size:11pt;font-family:"Calibri",sans-serif"><span></span></span></p>
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<p class="MsoNormal" style="line-height:106%;margin:0in 0in 8pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>Sincerely,<span></span></span></p>
<p class="MsoNormal" style="line-height:106%;margin:0in 0in 8pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>co-host:
KJ Min, Manisha Dolui, Toshiyuki Bandai, Jennifer Alvarez<span></span></span></p>
<p class="MsoNormal" style="line-height:106%;margin:0in 0in 8pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>faculty
coordinator: Asmeret Asefaw Berhe<span></span></span></p>
<p class="MsoNormal" style="line-height:106%;margin:0in 0in 8pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>-----------------------------------------------------------------------<span></span></span></p>
<p class="MsoNormal" style="line-height:106%;margin:0in 0in 8pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>Fall 2021 Enviro-Lunch Schedule<span></span></span></p>
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<p class="MsoNormal" style="margin:0in;line-height:normal;font-size:11pt;font-family:"Calibri",sans-serif"><b><span style="font-size:9pt;color:black">date<span></span></span></b></p>
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<p class="MsoNormal" style="margin:0in;line-height:normal;font-size:11pt;font-family:"Calibri",sans-serif"><b><span style="font-size:9pt;color:black">speaker<span></span></span></b></p>
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<p class="MsoNormal" style="margin:0in;line-height:normal;font-size:11pt;font-family:"Calibri",sans-serif"><b><span style="font-size:9pt;color:black">title<span></span></span></b></p>
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<p class="MsoNormal" style="margin:0in;text-align:right;line-height:normal;font-size:11pt;font-family:"Calibri",sans-serif" align="right"><b><span style="font-size:9pt;color:black">11/15<span></span></span></b></p>
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<p class="MsoNormal" style="margin:0in;line-height:normal;font-size:11pt;font-family:"Calibri",sans-serif"><span style="font-size:9pt;color:black">John
Nimmo <span></span></span></p>
<p class="MsoNormal" style="margin:0in;line-height:normal;font-size:11pt;font-family:"Calibri",sans-serif"><span style="font-size:9pt;color:black">@USDA<span></span></span></p>
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<p class="MsoNormal" style="margin:0in;line-height:normal;font-size:11pt;font-family:"Calibri",sans-serif"><span style="font-size:9pt;color:black">Preferential
flow through unsaturated soil: How can we understand and predict it?<span></span></span></p>
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<p class="MsoNormal" style="margin:0in;text-align:right;line-height:normal;font-size:11pt;font-family:"Calibri",sans-serif" align="right"><b><span style="font-size:9pt;color:black">11/22<span></span></span></b></p>
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<p class="MsoNormal" style="margin:0in;line-height:normal;font-size:11pt;font-family:"Calibri",sans-serif"><span style="font-size:9pt;color:black">Michael Kaiser<span></span></span></p>
<p class="MsoNormal" style="margin:0in;line-height:normal;font-size:11pt;font-family:"Calibri",sans-serif"><span style="font-size:9pt;color:black"><span> </span>@U of Nebraska<span></span></span></p>
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<p class="MsoNormal" style="margin:0in;line-height:normal;font-size:11pt;font-family:"Calibri",sans-serif"><span style="font-size:9pt;color:black">SOM dynamics<span></span></span></p>
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<p class="MsoNormal" style="margin:0in;text-align:right;line-height:normal;font-size:11pt;font-family:"Calibri",sans-serif" align="right"><b><span style="font-size:9pt;color:black">11/29<span></span></span></b></p>
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<p class="MsoNormal" style="margin:0in;line-height:normal;font-size:11pt;font-family:"Calibri",sans-serif"><span style="font-size:9pt;color:black">Thanksgiving<span></span></span></p>
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<p class="MsoNormal" style="margin:0in;text-align:right;line-height:normal;font-size:11pt;font-family:"Calibri",sans-serif" align="right"><b><span style="font-size:9pt;color:black">12/6<span></span></span></b></p>
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<p class="MsoNormal" style="margin:0in;line-height:normal;font-size:11pt;font-family:"Calibri",sans-serif"><span style="font-size:9pt;color:black">Carl Adair <span></span></span></p>
<p class="MsoNormal" style="margin:0in;line-height:normal;font-size:11pt;font-family:"Calibri",sans-serif"><span style="font-size:9pt;color:black">@ U of Vermont<span></span></span></p>
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<p class="MsoNormal" style="margin:0in;line-height:normal;font-size:11pt;font-family:"Calibri",sans-serif"><span style="font-size:9pt">Litter decay and soil organic matter
formation<span></span></span></p>
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