Hydraulic Structures: Fourth Edition

1.57.

pmaxon the bed is given by

gd  1030 9.81 8  88.4 103 Nm^2 ,

h 0  cotanh(1.57)0.37 m.

Assume linear distribution:

dHh 0  8 1.870.3710.24 m.

Takeypositive downwards from SWL. The pressure on the base of the

vertical wall, with the crest of clapotis at the wall, is

(yh 0 H)8.63 103 (30.371.87)

8.63 103 5.24 N m^2.

The force on the vertical face is

8.63 103 118.5 103 N

per unit length of the wall.

MOMENT ABOUT A

Because of the linear pressure distribution,

MA0.58.63 103 5.24^2 

206.9 N m

per unit length of the vertical wall.

5.24



3

5.24^2



2

88.4 103



10.24

π1.87^2



32

1.87



2.51

H



cosh(2πd/L)

2 π 8



32

2 πd



L

664 COASTAL ENGINEERING