of the Verde Island Passage, Philippines - weADAPT

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climate change vulnerability assessment of the verde island passage, philippines Historical data off Lubang Island shows a strong correlation between winds and waves in the study area (Figure 19). Wind speeds are generally stronger (8-10 ms -1 ) during the northeast monsoon months (November-March). Southwest monsoon (June- October) wind speeds are weaker (
chapter 1 • vulnerability assessment of marine ecosystems and fisheries to climate change: exposure 80 knots. Even during this high intensity event, winds within the Verde Passage move across the passage thus fetch is limited and waves do not become fully developed. The maximum significant wave heights were about 10m and were found in the area east and northeast of Marinduque. For the first period, the center of the storm can be seen in the area west of Marinduque with relatively low significant wave heights (Figure 22a). Within the Verde Passage, waves can still be significant (8m) although smaller in magnitude compared to the waves in the Sibuyan Sea. An estimate of the amount of wave energy available at the coast to stir up sediments and infer erosion potential is the plot of bottom orbital velocity (Figure 22b). Note that the largest values of orbital velocity are found in areas with shallow gently sloping bathymetry such as along the coast of Tayabas Bay and the northern coast of Lubang. For the second period used was after a period of 6 hours, the typhoon has moved westwards and the center can be found west of Puerto Galera. Maximum significant wave heights can still be found in the northwestern Sibuyan Sea along the coast of Batangas and Quezon (Figure 23a). Wave heights within the VIP although quite large, are still much lower than the maximum significant wave heights. Surprisingly the areas with high bottom orbital velocities are essentially the same as the model results 6 hours earlier (Figure 23b). These areas have two things in common; shallow gently sloping bathymetries and wide expanse of water facing the coast. With almost 160 typhoons going through within 200 km from Verde Island since 1952, it becomes necessary to integrate the effects of all these typhoons to assess the vulnerability with regards to storminess. This was a) b) 20' 9 20' 0.9 14ºN 8 14ºN 0.8 7 0.7 40' 6 40' 0.6 latitude 20' 5 4 latitude 20' 0.5 0.4 13ºN 3 13ºN 0.3 2 0.2 40' 1 40' 0.1 120ºE 30' 121ºE 30' 122ºE 30' longitude 120ºE 30' 121ºE 30' 122ºE 30' longitude Figure 22. Simulations for a category 5 typhoon when storm was still on the eastern side of the VIP. a) Significant wave height during typhoon with center west of Marinduque, and b) Bottom orbital velocity during typhoon with center west of Marinduque. a) b) 20' 9 20' 0.9 14ºN 8 14ºN 0.8 7 0.7 40' 6 40' 0.6 latitude 20' 5 4 latitude 20' 0.5 0.4 13ºN 3 13ºN 0.3 2 0.2 40' 1 40' 0.1 120ºE 30' 121ºE 30' 122ºE 30' longitude 120ºE 30' 121ºE 30' 122ºE 30' longitude Figure 23. Simulations for a category 5 typhoon when storm was still on the western side of the VIP. a) Significant wave height (m) during a typhoon with the center located near Puerto Galera, and b) Bottom orbital velocity (ms -1 ) from wave model forced by typhoon with center west of Puerto Galera. 15
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Conservation International (CI) Mis
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