A Model To Follow The Evolution In Time
Of Free Beach Fill
Author(s)
L. Rebaudengo Landò & S. Stura
Abstract
In this paper the evolution in time of free beach nourishment is dealt with by
considering in a linked manner the processes of longshore diffusion of the filled
sand and evolution of the cross profile, which presents an initial beach scarp that
of steeper than that of equilibrium. After examining existing models relevant to
the single processes, a simplified engineering model is proposed that follows the
evolution in successive steps. Each step refers to the actual values of wave
condition and profile slope that affect both processes. Application of the model
to a realistic beach nourishment supplies an indication of the reduction in time of
the surface of the sand platform between the initial boundaries, with particular
reference to the first months after the filling works. Final considerations are
made about the importance each process holds in the evolution.
Keywords: beach fill, free nourishment, longshore diffusion, cross-shore profile
evolution.
1 Introduction
This paper takes into consideration the changes that a beach nourishment
presents over time after a free beach fill is carried out to increase, for a designed
extension, the width of the emerged beach, in order to defend existing coastal
structures or to increase the space available as a seaside resort. Free fills, built
with sand slightly coarser than the native one to improve the stability of the
beach without altering its natural features, are appropriate when wave attacks are
predominantly head on. Under this hypothesis the background transport rate has
no influences, thus is not taken into consideration in the proposed model. In
Keywords
beach fill, free nourishment, longshore diffusion, cross-shore profileevolution
Related Book
Other papers in this volume
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