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Physics of estuaries and coastal seas
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the effect of high suspended sediment concentration on bed roughness and shear velocity
P-P1-11-S
Tang Jieping* , Nanjing University, School of Geography and Ocean Science
Wang Yaping,
Presenter Email: tjpsky@139.com |
| Suspended sediment concentration (SSC) and density stratification due to SSC will influence bed shear stress, μ*£¬which is an important parameter to estimate the start-moving of bed and diffusion of sediment. From 2015.12.20 to 2016.01.20, in-situ observation outside the abandoned Yellow River estuary recorded high suspended sediment concentration (HSSC) events of maximum SSC value reaching 8g/L. When HSSC events happening, the bed shear velocity calculated with LP and Reynolds methods had large different, where LP method was according to von Karman-Prandtl equation: U(z) = (μ*/k )ln(z/z0), and Reynolds methods was calculated by -ρ(u' w' ) with the turbulent fluctuation at 0.3 m above sea bed. It’s a good chance to research the effect of SSC on bed shear stress. |
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