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SDSU researchers show fluorescence sensors and radar detect sewage proxies in Tijuana River and coastal plumes
Summary
San Diego State University demonstrated fluorescence-based in situ sensors and remote sensing methods that correlate with E. coli and can map transboundary plumes; sensors require turbidity correction and frequent maintenance, and remote-sensing plumes require boat/shore validation.
Trent Biggs, professor of geography at San Diego State University and director of related monitoring projects, presented results from fluorescence sensors (tryptophan-like fluorescence and CDOM) and remote-sensing instruments deployed to map sediment and sewage contamination in the Tijuana River, estuary and nearshore plumes.
Biggs described two sensor workflows: lab bench measurements with an AquaLog that produced a strong linear correlation between tryptophan signal and wastewater percentage in controlled…
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