HI. Sediment Transport
143
J..~
(Q+ d_A_Q_Q, iSx)ST"
}.<--,,
Sxj~
.1f2
~
BH/tan 3
.-'f,
.6~'.~.
!
I y.
:7
eH
N.S.L.
,:
[
6
¢
Fig. 34 : Continuity equation (First stage)
where Q is the volume rate of alongshore sediment transport. If we further
assume that as the beach either erodes or accretes this profile retains the same
shape, tan I~, then we obtain :
~V = (D + BH) 5xSy
(98)
where ~y is the mean translation of the profile in that strip. Combining these two
equations and letting both ~x and 6t tend to zero, we obtain the continuity
equation •
cTQ + (D + BH) --cTY = 0
(99)
143
J..~
(Q+ d_A_Q_Q, iSx)ST"
}.<--,,
Sxj~
.1f2
~
BH/tan 3
.-'f,
.6~'.~.
!
I y.
:7
eH
N.S.L.
,:
[
6
¢
Fig. 34 : Continuity equation (First stage)
where Q is the volume rate of alongshore sediment transport. If we further
assume that as the beach either erodes or accretes this profile retains the same
shape, tan I~, then we obtain :
~V = (D + BH) 5xSy
(98)
where ~y is the mean translation of the profile in that strip. Combining these two
equations and letting both ~x and 6t tend to zero, we obtain the continuity
equation •
cTQ + (D + BH) --cTY = 0
(99)