I am interested in understanding fine sediment transport through watersheds on a variety of time scales. In Puerto Rico I am primarily focused on how single episodic storm events erode watersheds of varying lithology (volcanoclastics and quartz diorite) by analyzing suspended sediment samples collected over a storm hydrograph. In order to determine provenance, I employ multiple cosmogenic isotopes (7Be, 210Pb, 10Be) as tracers to characterize source areas and suspended sediments. I am also interested in using cosmogenic isotopes to understand fine sediment residence time on the hillslope and within the channel.
Stable-isotope and solute-chemistry approaches to flow characterization in a forested tropical watershed, Luquillo Mountains, Puerto Rico. Scholl, M.A., Shanley, J.B., Murphy, S.F., Willenbring, J.K., Occhi, M., and González, G. (2015): Appl. Geochem.
Papers and books that explicitly acknowledge a CZO grant are highlighted in PALE ORANGE.
Just passing through --- high Hg deposition to Puerto Rico forest moves quickly off the landscape. Shanley, J. B, J.K. Willenbring, J. Kaste, M. Occhi, W.H. McDowell (2012): AGU Annual fall meeting