EM 1110-2-1100 (Part II)
30 Apr 02
EXAMPLE PROBLEM II-6-2
Given:
Using the same inlet system discussed in Example Problem II-6-1, consider the effect of a constant river
discharge of 350 m3/s (12,360 ft3/s).
Find:
What are the effects of river discharge on high-water and low-water elevations in the bay, bay tide range,
and maximum flood and ebb velocities, the maximum flood and ebb discharges, and the bay tide phase
lag.
Solution:
Using Equation II-6-19 for dimensionless variable QrN with ao, Ab , and T from Example Problem 1 and Qr
given above
Qr T
)
Qr '
2 π ao Ab
350 (44712)
)
Qr '
' 0.20
7
2(3.14) (1.30/2) (1.90 x 10 )
Using Equation II-6-11, find the Keulegan K, knowing K1 and K2, as calculated in Example Problem 1.
1
1
K'
k2
K1
1
1
K'
' 0.75
0.25
28.8
(or calculate Keulegan K from Equation II-6-4).
With K = 0.75 and QrN = 0.20, bay tidal response is determined from Figure II-6-25
ab max
' 0.92
ab max ' 0.92 (0.65) '0.60 m
ao
and from Figure II-6-26
ab min
' &0.56
ab min ' &0.56 (0.65) ' &0.36 m
ao
(Continued)
II-6-34
Hydrodynamics of Tidal Inlets
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