3. Sédiment Transport
49
BREAKER ZONE
Fig. 3.8 Radiation stresses for oblique approaching waves.
In either case, the results are:
S.x = Sxx + Syy + Sxx - Syy
Syy = Sxx + Syy - Sxx ~ Syy cos 16
(3.12)
2
2
c
Sxx - Syy .
Sxx - Syy
Q
Sxy------- --------sin20 =---------------- sin 2ç> — byx
(3.13)
wherein, Sxx\ radiation stress acting on a plane perpendicular to the coast,
Syy\ radiation stress acting on a plane parallel to the coast, Sxy. radiation
shear stress acting on a plane perpendicular to the coast, Syx\ radiation
shear stress acting on a plane parallel to the coast, 0: angle between the
two axis Systems, ip: angle between wave crest and coast line.
The components Sxx and Syy are similar to a normal stress, and Sxy
and Syx to a tangential stress, or shear stress.