The wavewatchiii wwiii model was utilized for the

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Unformatted text preview: y storms in the 40-60oS latitudes) and local swells. The WaveWatchIII (WWIII) model was utilized for the hindcast. The over water wind field was defined using the NCEP/NCAR reanalysis winds, including spatial and seasonal adjustments based on comparison to QuikSCAT satellite scatterometer measurements. The wave climate was validated against 15 years of satellite altimeter measurements, and 12 months of buoy measurements at the site. Figure 4 presents sample output from the WWIII model. Figure 4 – Sample Output from WaveWatchIII Model Nearshore wave transformations were simulated using the MIKE21 Nearshore Spectral Wave (NSW) model. The 20-year nearshore wave climate (in a depth of 21 m) is summarized below: • Peak wave direction typically East through SSE; • Mean Hs/Tp= 2 m/11 s; • Max. Hs = 6.2 m (with Tp = 12 s); • Max. Tp = 22 s (with Hs up to 3 m). A higher resolution wave model was used to simulate waves and surges generated by tropical cyclones (TCs). Given the scarcity of data regarding TCs in this region (storm tracks were available back to 1945, but information on storm severity was only available for a few events), a Monte Carlo simulation was utilized, with a database of 1,000 “synthetic” TCs developed and simulated in the wave model. Analyses of these data indicated that the extreme wave conditions would be depth-limited at the project site. MIKE21 NSW simulations (and physical model tests undertaken later) indicated breaking wave heights of up to Hs = 8 m (Tp = 10 to 16 s) along the outer end of the proposed breakwater. 6 QUARRY INVESTIGATION The identification of a suitable source of quarried stone (for coastal structures) and aggregates (for roadways and concrete) was a key task. Initial reconnaissance around the project area identified a number of potential quarry sites. Preliminary evaluations identified the “North-South-West hill complex”, located approximately 10 km from the port site, as the most likely source for this project (refer to Figure 5). Figure 5 – Overview of Proposed Quarry Site A preliminary test blast was undertaken in 200...
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This note was uploaded on 02/04/2014 for the course HE 8450 taught by Professor Verhagen during the Spring '14 term at Technische Universiteit Delft.

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