Question 2 Note Use The Plots Provided At The End Of This Paper During A Storm Event A Wind Speed Of 30 M S Blows Ove 1 (77.63 KiB) Viewed 9 times
Question 2 Note Use The Plots Provided At The End Of This Paper During A Storm Event A Wind Speed Of 30 M S Blows Ove 2 (132.2 KiB) Viewed 9 times
Question 2 Note: Use the plots provided at the end of this paper. During a storm event, a wind speed of 30 m/s blows over a deep lake for a period of 4 hours. The fetch length in the direction of the wind is 12 km. Determine: a) The Hs and Ts generated at the downwind end of the lake after this period. Is the wave generation fetch or duration limited? [12 marks] b) The wave height corresponding to H15. Assume that the wave heights generated within the lake follow a Rayleigh Distribution. What does this wave height, H15, represent? (Note: use your answer from part a) [6 marks] c) Explain why a more accurate estimation of the wave climate can be determined using numerical modelling methods. List two types of numerical modelling software which could be used to estimate nearshore wave conditions for coastal engineering design purposes. [6 marks]
gTs/2W 0-1 g Hs/W2,9 Ts / 2W gHs/W2 10-2 لييييلاد 10-3 10 102 103 104 F/W2 (solid), gt/W (dashed) Fig 2: SMB Wave Prediction Curves (Sorensen, 2006) 0.001 b 0.005 0.01 0.05 a 0.1 0.5 1.0 1 2.2 0.5 1.0 1.2 1.4 1.6 1.8 2.0 2.4 2.6 H/Hems Fig 3: Rayleigh distribution for wave heights (U.S. Army Coastal Engineering Research Center, 1984). Line a - probability that any height will exceed the height H/Hrms. Line b-average height of the n highest fraction of the waves
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