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ABSTRACT
Li, C.; Fu, X.; Xiao, Q.; Pan, X., and Cao, H., 2018. Vertical distribution of sediment concentration in offshore waters. In: Liu, Z.L. and Mi, C. (eds.), Advances in Sustainable Port and Ocean Engineering. Journal of Coastal Research, Special Issue No. 83, pp. 167-171. Coconut Creek (Florida), ISSN 0749-0208.
The existing formulae of vertical distribution of sand concentration are difficult to integrate. Based on the formula of vertical distribution of the flow velocity obtained in the previous study and the suspended sediment diffusion equation in equilibrium, a formula of the distribution of suspended sediment is deduced. It can effectively avoid the phenomena that the Rouse formula equals zero at the water surface. The field measurement data of Jiangsu Sea is used to verify and analyze the deuced formula. And results show that it has a high accuracy and it solve the difficulties caused by lack of data in engineering, such as only the sediment concentration on the surface is given.
ADDITIONAL INDEX WORDS: Vertical distribution of sediment concentration, sediment-laden flow, near-shore waters.
(ProQuest: ... denotes formulae omitted.)
INTRODUCTION
The vertical distribution of sediment concentration is an important indicator for studying the movement of suspended particles in water bodies. The main research methods are diffusion theory, energy theory, hybrid theory, stochastic theory and similar theory. Various theories have achieved many results (Rouse, 1973; Vanoni, 1946).
There are many theoretical systems for studying the vertical distribution of sediment concentration, and the distribution formulas for vertical distributions of suspended sediments are also different (Gonca, 2017; Yang et al., 2017). However, there is no conclusive formula that can be applied to coastal waters. Most of formulae are deduced from the sediment diffusion equation with different diffusion coefficient. Sediment diffusion coefficient is often assumed to be consistent with the moment exchange coefficient. The commonly used forms for sediment diffusion coefficient are linear, parabolic and constant-parabolic joint type. And the commonly used vertical distribution formulae for suspended sediment concentration include Rouse's formula and van Rijn's formula. Most of the existing formulae are the improvement of the Rouse formula (Umeyama, 1992; Wright and Parker, 2004), the correction of the sediment diffusion coefficient (Huang et al., 2010; Huang et al., 2008), under sediment transport disequilibrium and the improvement of turbulence mixing...