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 *Q*rN with *a*o, Ab , and *T *from Example Problem 1 and *Q*r

given above

)

2 π *a*o Ab

350 (44712)

)

' 0.20

7

2(3.14) (1.30/2) (1.90 *x *10 )

Using Equation II-6-11, find the Keulegan *K*, knowing *K*1 and *K*2, as calculated in Example Problem 1.

1

1

1

1

' 0.75

0.25

28.8

(or calculate Keulegan *K *from Equation II-6-4).

With *K *= 0.75 and *Q*rN = 0.20, bay tidal response is determined from Figure II-6-25

' 0.92

and from Figure II-6-26

' &0.56

(Continued)

II-6-34

Hydrodynamics of Tidal Inlets

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