Table 4-12. Example Estimate of Gross Longshore Transport Rate for Shore of Inland Sea
(1)
(ft.)
(2)
f
(3)
(ft.)
(4)
n/'K4
(5)
(3) X (4)
(ft.)
1
0.28
0.28
1.2
0.336
2
0.125
0.25
1.2
0.300
3
0.075
0.225
1.2
0.270
4
0.02
0.08
1.1
0.088
5
0.005
0.025
1.1
0.028
8
0.005
0.04
1.0
0.040
= 1.062
(1)
— significant height reduced from gage records, assumed to correspond
to the height obtained by visual observers
(2) f — décimal frequency of wave heights
(K4
(4) —— — assumed shoaling-coefficient ratio.
(5) Hb = z r fH
(K4 g
1.062 ft.
Q
2 X 10
2.26 X 105 cu.yd./yr. from Equation 4-44
Note that shoreward-moving waves exist only 51 percent of the time.
4-110
(1)
(ft.)
(2)
f
(3)
(ft.)
(4)
n/'K4
(5)
(3) X (4)
(ft.)
1
0.28
0.28
1.2
0.336
2
0.125
0.25
1.2
0.300
3
0.075
0.225
1.2
0.270
4
0.02
0.08
1.1
0.088
5
0.005
0.025
1.1
0.028
8
0.005
0.04
1.0
0.040
= 1.062
(1)
— significant height reduced from gage records, assumed to correspond
to the height obtained by visual observers
(2) f — décimal frequency of wave heights
(K4
(4) —— — assumed shoaling-coefficient ratio.
(5) Hb = z r fH
(K4 g
1.062 ft.
Q
2 X 10
2.26 X 105 cu.yd./yr. from Equation 4-44
Note that shoreward-moving waves exist only 51 percent of the time.
4-110