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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Water engineering : Numerical simulation of suspended sediment transport induced by near-shore wave breaking
Numerical simulation of suspended sediment transport induced by near-shore wave breaking
Author : MARIANGELA TH. SFOUNI-GRIGORIADOU(1), GERASIMOS A. KOLOKYTHAS(2) & ATHANASSIOS A. DIMAS(3)
ABSTRACT
The behavior of sediment in suspension induced by wave breaking over a constant-slope beach, is investigated. The
simulations are based on the coupled numerical solution of the flow equations (continuity and Navier-Stokes) with the
transport equation for suspended sediment load. The Navier-Stokes equations subject to the fully nonlinear free-surface
boundary conditions and appropriate bottom, inflow and outflow boundary conditions, while the bed concentration
boundary condition for the suspended sediment, is defined by means of empirical formulas depending on the
instantaneous bed shear stress. The settling velocity of sediment grains is calculated by use of an empirical formula
depending on the grain diameter. The equations of fluid and sediment motion are properly transformed so that the
computational domain becomes time-independent. In the present study, three cases of characteristic grain size
normalized to the characteristic water depth, Ds/d = 10-4, 2∙10-4 and 5∙10-4, are investigated. During wave breaking and
also in the surf zone, strong uplift of bed sediment is observed, while the maximum height of sediment suspension
reaches almost the 80% of the local depth for the case of the smallest grain size. On the contrary, sediment suspension
is restricted in the vicinity of the bed, for the case of the bigger grain size. The spatial distribution of the net discharge of
suspended sediment clearly indicates the tendency of sediment to move to the offshore direction.
File Size : 762,143 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Water engineering
Date Published : 13/08/2015
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