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Sedimentation process of fine sediment in reservoirs
is an important phenomenon, and yet how this process works is unclear
to engineers studying issues of reservoir sedimentation. Analysis is limited
at this time to sand-bed rivers transporting two grain sizes: sand as
bed load, and mud as wash load. A deltaic deposit mainly constituted by
sand is formed when rivers reach a reservoir. If the wash load is enough
to produce river water heavier than the water in the reservoir, the river
flow plunges to form a turbidity current. The fine sediment is deposited
as a bottomset. The work reported here pertains to an integral, physically
based, moving boundary model that captures the evolution of the river-delta
deposit, as well as the muddy lake deposit. Water detrainment across the
turbid-clear water interface in ponded turbidty currents is used to describe
the turbidity current evolution in the reservoir. The 1D numerical model
is tested against the results of laboratory experiments.
For more information contact: Horacio Toniolo (907) 474 7977 |