Hydrodynamic Equilibrium for Sediment Transport and Bed Response to Wave Motion

作者：Kaczmarek Leszek M; Sawczynski Szymon^*; Biegowski Jaroslaw

来源：Acta Geophysica, 2015, 63(2): 486-513.

DOI：10.1515/acgeo-2015-0008

• hydrodynamic equilibrium
• linear equation of morphological changes
• thickness of eroded/accumulated sediment
• sand trap

An experimental and theoretical identification of hydrodynamic equilibrium for sediment transport and bed response to wave motion are considered. The comparison between calculations and the results of laboratory experiments indicates the linear relation between sediment transport rate and the thickness z(m) of bed layer in which sediments are in apparent rectilinear motion. This linear relationship allows to use the first order "upwind" numerical scheme of FDM ensuring an accurate solution of equation for changes in bed morphology. However, it is necessary to carry out a decomposition of the sediment transport into transport in onshore direction during wave crest and offshore direction during wave trough. Further, the shape of bed erosion in response to sediment transport coincides with the trapezoid envelope or with part of it, when some sediments still remain within it. Bed erosion area is equal to the one of a rectangle with thickness z(m).

• 出版日期2015-4