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Numerical investigation of turbidity currents flowing through minibasins on the continental slope

Sadia M. Khan and Jasim Imran
Numerical investigation of turbidity currents flowing through minibasins on the continental slope
Journal of Sedimentary Research (April 2008) 78 (4): 245-257

Abstract

Numerical investigation of the dynamics of turbidity currents flowing through a series of minibasins is conducted. A two-dimensional vertical-structure-resolving finite-volume model is developed to solve the Reynolds-averaged Navier-Stokes equations along with the sediment mass conservation equation in a non-orthogonal grid system. In addition, the Exner equation of bed sediment conservation is solved to study changes in the bed level. The model is verified against three laboratory experiments conducted by Lamb et al. (2004) and Lamb et al. (2006) to study the dynamics of continuous-feed turbidity currents and the depositional characteristics in a minibasin. Simulation results show that the sediment deposition pattern predicted by the model is in reasonably close agreement with the measurements. The model successfully captures draping of sediment over the initial bed irregularities. Vertical distributions of concentration profiles are also found to be in good agreement with the measured data. Field-scale investigation is carried out by considering two minibasins in a series. It is observed that the inflow condition of a continuous-feed turbidity current can strongly influence the bed morphology of the minibasin. For the same inflow velocity and suspended-sediment concentration, larger sediment particles in the inflow cause overall deposition while smaller sediment particles lead to erosion.


ISSN: 1527-1404
EISSN: 1938-3681
Serial Title: Journal of Sedimentary Research
Serial Volume: 78
Serial Issue: 4
Title: Numerical investigation of turbidity currents flowing through minibasins on the continental slope
Affiliation: University of South Carolina, Department of Civil and Environmental Engineering, Columbia, SC, United States
Pages: 245-257
Published: 200804
Text Language: English
Publisher: Society for Sedimentary Geology, Tulsa, OK, United States
References: 24
Accession Number: 2008-084458
Categories: Oceanography
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by SEPM (Society for Sedimentary Geology), Tulsa, OK, United States
Update Code: 200825
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