http://uoregon.edu/~dogsci/ 2009-11-24T18:57:07-08:00 http://uoregon.edu/~dogsci/ http://uoregon.edu/~dogsci/lib/images/favicon.ico text/html 2008-04-09T12:17:21-08:00 http://uoregon.edu/~dogsci/directory/faculty/rdorsey/about?rev=1207768641 Professor (sedimentology, basin analysis) Geological Sciences faculty member since 1997. B.S., 1983, Vermont; M.A., 1986, Ph.D., 1989, Princeton. Office: 305D Cascade Hall Phone: 541-346-4431 Email: rdorsey 'at' uoregon.edu Sediment Gravity Flows (Spring, 2008) text/html 2008-03-31T18:31:27-08:00 http://uoregon.edu/~dogsci/directory/faculty/rdorsey/sedflowpapers?rev=1207013487 ---------- ---------- Here are some Papers text/html 2008-04-01T12:01:20-08:00 http://uoregon.edu/~dogsci/directory/faculty/rdorsey/sedflowrefs?rev=1207076480 ---------- ---------- Some References on Sediment Gravity Flows Allen, J.R.L., 1971. Mixing at turbidity current heads, and its geological implications. J. Sediment. Petrol. 41, 97– 113. Bagnold, R.A., 1954. Experiments on a gravity-free dispersion of large solid spheres in a Newtonian fluid under shear. Proc. R. Soc. Lond., A 225, 49– 63. text/html 2008-04-17T18:26:39-08:00 http://uoregon.edu/~dogsci/directory/faculty/rdorsey/sedflows?rev=1208481999 Seminar on Sediment Gravity Flows Spring 2008, Tuesdays 3:30-5:00 p.m. ---------- ---------- Week 1 (April 1): Introduction; Background Concepts ---------- ---------- Week 2 (April 8): Two papers - Fisher (1983) and Postma et al. (1988) text/html 2008-04-01T12:40:02-08:00 http://uoregon.edu/~dogsci/directory/faculty/rdorsey/sedflows1?rev=1207078802 ---------- ---------- Week 1: Background Concepts * Laminar vs. Turbulent Flow * “Fluids” and “Plastics” Defined * Mass Transport Processes: There are too many different classification schemes. Not a problem, just recognize that different people use different names for things. text/html 2008-04-06T22:34:46-08:00 http://uoregon.edu/~dogsci/directory/faculty/rdorsey/sedflows2?rev=1207546486 Week 2: Papers by Fisher (1983), and Postma et al. (1988) ---------- ---------- Fisher (1983) emphasized the concept of flow transformations, which involve the change from laminar to turbulent - or turbulent to laminar - behavior in sedment gravity flows. I thought that the distinctions between his four different types were a little hard to keep track of, and were not as important as simply the fact that transformations occur and leave a signal in the stratigraphic record. Also important, Fi… text/html 2008-04-17T18:33:38-08:00 http://uoregon.edu/~dogsci/directory/faculty/rdorsey/sedflows3?rev=1208482418 Week 3: Papers by Lowe (1979) and Lowe (1982) ---------- ---------- Today's discussion focused on the paper by Lowe (1982) - Sediment gravity flows: II. Depositional models with special reference to the deposits of high density turbidity currents. J. Sediment. Petrol. 52, 279-297. Topics included interactions and transformations between turbidity currents, debris flows, and grain flows moving down a subaqueous slope. We discussed the problem of how to maintain gravel clasts moving in a grain…