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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Sediment management and morphodynamics : High concentation layer over silt-sand mixtures under waves
High concentation layer over silt-sand mixtures under waves
Author : P. YAO(1)(3), M. SU(1)(3), Z.B. WANG(1)(2), C.K. ZHANG(3), Y.P. CHEN(3) & M.J.F. STIVE(1)
The sediment in a silty coast behaves different from that of a sandy coast and muddy coast. One of its distinctive
characteristics is the formation of the high concentration layer (HCL) near bottom during the stormy weathers. Although
this phenomenon is well known, the formation and transport mechanism is poorly understood. Historically, many theories
have been proposed to describe the near bed sediment concentration for non-cohesive sediments, whether these
formulations are suitable for the silt-enriched HCL is unclear. We conducted a series of flume experiments to explore this
knowledge gap on the HCL of the silty coast. Two types of bed materials with different silt content are investigated. Quasisteady
HCL near bottom has been reproduced in a wide range of wave conditions. The concentration inside the HCL
(lowest measuring point) varies from 3 g/l to 60 g/l. Then, several existing near bed concentration predictors are tested
against the experimental data. The results show that the latest formula of Van Rijn (2007a; 2007b) can give the best
overall fitting and can be used as a predictor for silt range after coefficient recalibration.
File Size : 968,880 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Sediment management and morphodynamics
Date Published : 13/08/2015
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