Event Detail

Event Type: 
Applied Mathematics and Computation Seminar
Friday, January 29, 2010 - 04:00
Gilkey 113

Speaker Info

Department of Geosciences, Oregon State University

We have developed resazurin as a tracer for metabolically active transient storage (MATS) in streams. Resazurin is a weakly fluorescent redox-sensitive dye that undergoes an irreversible reduction to strongly fluorescent resorufin under mildly reducing conditions, most commonly in the presence of living microorganisms. Resazurin reduction to resorufin proceeds very quickly (10s of minutes) in benthic sediments - i.e., resazurin reduces to resorufin during transient storage in dead zones and the hyporheic zone. We model the transport of resazurin, resorufin, and a conservative tracer (typically NaCl) that exchange with transient storage zones and react using a set of 6 coupled, linear, partial differential equations. The PDEs are solved via the Laplace transform and numerical inverse transformation.