Poster 183 – Click on poster below to view presentation from author.
North Carolina State University
Co-Authors: Chadi Sayde, Barbara Doll
Green infrastructure is of growing importance in the face of extreme weather events and environmental degradation. However, the subsurface dynamics of stormwater systems, especially media-based treatment systems such as regenerative stormwater conveyance (RSC), are not yet fully understood. Through technological advancements, the precision and availability of in-situ monitoring tools increased dramatically. However, an accurate method for determining water fluxes through these treatment systems remains uncertain and challenging. Existing methods have limited applications due to their minuscule sphere of influence given the need to understand flux density behavior over large spatial scales. To overcome this limitation, we have implemented fiber-optic distributed temperature sensing (FO-DTS) technology, capable of hundreds of simultaneous measurements and can be configured at various scales. The fiber-optic cable is buried in the treatment system media and water flux is inferred from the FO cable’s thermal response to heat pulses generated by supplying a constant current to the shielding the cable. This methodology enables both continuous heating and temperature measurements along the desired length of FO cable, allowing for fluxes to be measured throughout an RSC cross-section. These measurements are necessary to understand the conditions that facilitate the treatment mechanisms employed to remove pollutants and evaluate the system’s efficacy.
Laboratory tests and field data indicate a potential for FO-DTS applications under various use cases; however, further experimentation is required to address the challenges that these methods present in practice. We will be presenting the theoretical background, preliminary results of laboratory and field experiments, and how our data can evaluate the internal hydraulics of media-based systems to inform better design decisions.
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