= Calculate the wave height at Point O which is sheltered by the island PQ shown in Fig. 1. Assume incident wave height is H. - 5 m, wave period is T, 10 s, bathymetry contours are parallel to shoreline and water depth (d = 20 m) is constant. Use the diffraction curves in Fig.2 to determine the diffraction coefficient (Ka). Hint: Ka = K+Kaz V 77 8 22%20 20 18 16 14 12 10 8 6 2 0.95 -0.8 0,6 4ks Height Ratio. Period Ratio 0.5 Principal Wave Direction 2km 0.9 30.85 0.85 3km Island Fig.1: Study area O Design Site WES 77 incidence 200 180 160 140 120 100 80 60 40 20 0.9 70.670, 3-0.3 10.7 1.0 2.95 0 10 8 6 4 2 02 4 6 8 10 1 Wave Direction Wave Direction. Fig.2: Diffraction diagram of a semi-infinite breakwater for random sea waves of normal 1.0 100 80 60 40 20 0 20 40 60 80 100 Band Hi