118
Sy = Sy (Ay- W)
wherein :
Sy = onshore-offshore transport
Sy = proportionality constant
R.H. Charlier and Chr. P. De Meyer
(55)
I
.op.,. ,ira,, o, ,,,,i,,,, prg:i. -,. ._J!
__.__
l
I'"_..¢¢_ ~,
~'
,
t, (Y
i
Ft=F~,. It:)= F4
Fig. 20 : Two-Line schematization by Bakker
A y = distance between beach-line and inshore-line
W = equilibrium distance
In an equilibrium situation Sy = 0 and W = A y.
The concept of Bakker regarding the onshore-offshore
essential element in the theory of Swart, discussed below.
transport forms an
3.2
Predictive Model of Swart
Swart (1974) presents a model for the computation of offshore sediment transport
on sandy beaches under wave action, and of the corresponding time-dependent
and eventual equilibrium beach profiles. Essentially Swart follows Bakker's
concept that the offshore transport is proportional to the difference between the
actual profile and the equilibrium profile.