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10 marks
Aestion 1
: 2 marks
Define the terms "Rip Current” and “Longshore Current”. S Se
etna “ware Breaking” and list the four diferent types of wave breaking. see
Define “Wave Set Up", "Wave Set Down” and “Wave Overtopping” ‘i Sonewenel 2marks
iv. Define the term "Wave Diffraction” and draw two different wave diffra. pes
fwestion 2 : 3 marks
ie Joose the two main types of breakwaters and give an example for each ‘of them. Gee
ii, State two purposes of breakwaters. - tical
iy State and draw the three types f incident wave energy transformation infront of vertical
breakwater. a
Ree 6 marks
in the north-
Ahestion 3
AA wave train is observed approaching a coast that has straight parallel near-shore contours
rave crest forms an angle of 14°
south direetion. Where the depth is 12m, the wavelength is 86.5 and the w.
with the shore (waves from south-west). What isthe incident wave direction in deep water?
5 marks
Axcestion 4
A train of 6-sec waves approaching an impermeable, non-reflecting breakwater at an angle 9=60°. If the
water depth is constant at 10 m, what would be the wave height at 8=30° and r = 96.6 m from the
breakwater tip, when the incident wave height is 1m.
ection 5 7 marks
wove is expressed as yt) = 6.5¢0s (2x +t)
«Assuming the depth same asthe wave eight, assy the above wave. mark
i Find he flowing component
2 wevlenet ie mark
& weaperod Imerk
samspade 2 tanh tae Eva
& wove he tai
ii, Sketch the wave clearly showing the respective figures as computed in part (i). marks
ae er OS
orl te 2rmarks
Define Littoral Drift and list two types a
>i. List any four physical properties of interest in the design of engineering works in the coastal zone,
2marks
. Determine the phi median diameter, phi mean diameter, phi deviation measure, phi skewness measure
and sample permeability usin the following data: Oxg = 0.85, gy = 145, Dy = 2.15
‘S marks
iv, Determine the fall velocity of irregular sand particles with density of 2650 kg/m? when itis transported
insaltwater of density 1025 kg/m?, Assume the kinematic viscosity of water as 10*m?/s and Op = 1.65
marks,
Aaesion? 7 marks
Conder the shallow water wave (depth=12m, wave period = 6 sand wave height = 0.7Sm) propagating
town the ahora with oo efracion, The wow raaks and rne up on 33:20 tatrepad slope having v eon
depth of 4 m. Determine:
breaking wave eight. mars
Smarks
li, wave run up elevation on the tetrapod's slope,
(CEB B11 ~ Coastal gineering ~ Summer - 2020 Page?
