ÿThe Environmental Fluid Dynamics Lecture SeriesPresents a Seminar Professo

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ÿThe Environmental Fluid Dynamics Lecture SeriesPresents a Seminar Professo

City University of New York, School of Law at Queens College, US has reference to this Academic Journal, ÿThe Environmental Fluid Dynamics Lecture SeriesPresents a Seminar Professor Gary ParkerW.H. Johnson Professor of Engineering in addition to also GeologyUniversity of IllinoisChampaign UrbanaTuesday, January 21Rm. 117 Hayes-Healy11am-12noon Emplacement of Massive Turbidities Linked so that Extinction of Turbulence in Turbidity Currents(by Mariano Cantero, Tzu-hao Yeh in addition to Gary Parker)ÿÿABSTRACTTurbulent flows that carry suspended sediment are naturally self-stratifying. Such sediment settles toward the bed alongside a flux that is linearly dependent upon fall velocity. Maintenance of this sediment in suspension requires a balancing upward Reynolds flux, further dictating that mean suspended sediment concentration should decrease upward. Since higher concentration implies larger density, the implication is that sediment suspension generates its own stable stratification. In the case of rivers, this self-stratification can act so that damp turbulence, so decreasing the ability of the flow so that maintain the suspension. The flow itself, however, is not extinguished, because the driving force of the flow results from the downstream component of gravity acting on the water, rather than the sediment phase. Turbidity currents, i.e. dense bottom currents driven by suspended sediment, have many similarities so that river flows. They differ, however, in that the driving force of the flow acts directly on the sediment. In this case, sufficient self-stratification can kill the entire flow, causing the emplacement of a massive deposit of sediment. Conditions in consideration of this extinguishing of the flow can be reached as, in consideration of example, a turbidity current traverses ever-lower slopes. These results are demonstrated using direct numerical simulations of channel flows in addition to turbidity currents.

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