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<p class="MsoNormal">Hello all,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Please join us for Riley Thomason$B!G(Bs MS Defense on Wednesday, November 5 @ 2:00 pm in EOAS 3067.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-family:"Aptos",sans-serif;color:black">Title: Tracing Storm Runoff from Hurricane Idalia in Two Springs in North Florida Using Oxygen and Hydrogen Isotopes<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Aptos",sans-serif;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Aptos",sans-serif;color:black">Name: Riley Thomason<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Aptos",sans-serif;color:black">Date: Wednesday, November 5, 2025, at 2:00 pm EST<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Aptos",sans-serif;color:black">Advisor: Yang Wang<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Aptos",sans-serif;color:black">Location: EOAS 3067<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Aptos",sans-serif;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Aptos",sans-serif;color:black">Abstract: Recharge in karst aquifer systems, such as the Floridan Aquifer, can occur rapidly through sinkholes, sinking streams, and conduits in underground limestone, making these
systems susceptible to contamination from surface water. Analyses of various chemical and isotopic tracers in water samples from major springs in North and Central Florida have yielded a wide range of transit times, making it difficult to reliably assess how
long it might take for contaminants to move through the aquifer and affect water quality at the springs. This study used time-series water isotope data collected before and after Hurricane Idalia to investigate the impact of storm runoff in Wakulla Spring
and Sally Ward Spring in North Florida. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Aptos",sans-serif;color:black">Between August 28, 2023, and October 27, 2023, water samples from Wakulla Spring had $B&D(B18O and $B&D(BD values ranging from –3.8 to –3.6$B"s(B and –19.0 to –13.5$B"s(B, respectively, while samples
from Sally Ward Spring had $B&D(B18O and $B&D(BD values ranging from –4.3 to –2.7$B"s(B and –22.3 to –15.2$B"s(B, respectively. The $B&D(B18O and $B&D(BD values of rainwater from Hurricane Idalia, which passed through the study area on August 30, 2023, were –15.2$B"s(B and –108.5$B"s(B, respectively,
considerably lower than those of normal rainfall in the region. This distinctive isotopic composition provided a valuable hydrologic tracer for tracking storm-derived water in the regional groundwater system. Following the hurricane, event water was detected
at Sally Ward Spring within one day, whereas it took 10–12 days for the event water to appear at Wakulla Spring. A second isotopic signal was observed at Sally Ward Spring 12–19 days later, indicating complex recharge and flow dynamics. These observations
suggest that although the two springs are closely located, they respond quite differently to major storm events. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Aptos",sans-serif;color:black">At Wakulla Spring, the estimated 10–12-day transit time for event water agrees with previous estimates based on dye tracing and stable isotope measurements. Both springs showed elevated
particulate matter concentrations following Hurricane Idalia. USGS records also documented a five-day period of increased gauge height at Wakulla Spring, consistent with enhanced runoff and aquifer discharge. However, isotope mass balance calculations indicate
that even at peak discharge, event water made up less than 1% of total discharge at Wakulla Spring and about 7% at Sally Ward Spring. These results demonstrate that discharges at both Wakulla and Sally Ward Springs are dominated by pre-event water stored in
the aquifer, even following a major storm. <o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Best, <o:p></o:p></p>
<p class="MsoNormal">Adea<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-family:"Segoe Script"">Adea Arrison</span><span style="font-size:10.0pt;font-family:"Segoe Script""><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Segoe Script"">Sr. Academic Program Specialist<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Segoe Script"">Department of Earth, Ocean & Atmospheric Science<o:p></o:p></span></p>
<p class="MsoNormal"><a href="https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.eoas.fsu.edu%2F&data=05%7C02%7Ceoas-seminar%40lists.fsu.edu%7Cf7c797d1ffe84478ff2e08de1aedc306%7Ca36450ebdb0642a78d1b026719f701e3%7C0%7C0%7C638977805625551309%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=o7zHXO87n%2BzEAP27prZENJUgy0i%2BsXT7h9c3m7bSA2c%3D&reserved=0" originalsrc="https://www.eoas.fsu.edu/"><span style="color:blue;text-decoration:none"><img border="0" width="92" height="55" style="width:.9583in;height:.5729in" id="Picture_x0020_1" src="cid:image001.png@01DC4CAC.B7097B10"></span></a><o:p></o:p></p>
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