CETN IV-15
Rev. September 1999
km
.2
3
N
∆VA1 = 47
∆Vfl = 15
PA1 = 13
Rfl = 0
0
23
=
Qfl_ch= 15
1
A
et_
Qn
5
48
∆Vch= 19
Rch= 2.4
∆VA2 = - 48
5
25
Qj_A1 = 189
PA2 = 25
Qj_A2 = 16
Qebb_A1 = 0
Qebb_ch= 168
7.3
km
=
3.2
A1
Qebb_A2 = 91
sl_
Q
1
14
∆Vebb = 77
=
A2
Rebb = 0
7
t_
31
Q ne
.3
=7
6
Units: Thousands m3/yr
17
2
Q sl_A
(not to scale)
Figure 3. Revised sediment budget for Shinnecock Inlet, New York
Calculations: Applying Equation 4 gives an active depth for A1 and A2,
D A = B + DC
= 3.5 + 7.0
= 10.5 m
The rate of volume change for A1 and A2 can be calculated with Equation 5,
∆y ∆x D A
= (1.40 m/year) (3,200 m) (10.5 m)
=
∆VA1 =
47,000 cu m/year
∆t
∆y ∆x D A
∆VA2 =
= (-1.43 m/year ) (3,200 m) (10.5 m)
=
- 48,000 cu m/year
∆t
Losses because of relative sea-level rise can be estimated by Equation 6,
12