Transport and resuspension of fine particles in a tidal boundary layer near a small peninsula

The authors present a theory on the transport and resuspension of fine part icles in a tidal boundary layer when the ambient tidal flow is nonuniform d ue to a peninsula along the coastline. As a first step toward better physic al understanding the authors adopt the model of constant eddy viscosity and a horizontal seabed. Attention is focused on a peninsula whose horizontal dimension is much smaller than the tidal wave length bur larger than the ti dal excursion length. General expressions of shear-induced dispersivities a nd convection velocity are derived in terms of the ambient flow field. Nonu niformity in the horizontal flow is found to have profound effects on the s patial variation of the dispersion tensor as well as the horizontal convect ion velocity. Two numerical examples are given for a semicircular peninsula : one for a particle cloud released near the peninsula over a nonerodible s eabed, and one for the resuspension over an erodible belt around the penins ula.