| Summary: | 碩士 === 國立臺北科技大學 === 土木工程系土木與防災碩士班（碩士在職專班） === 104 === The construction of public infrastructure should consider its entire life cycle, including feasibility assessment, planning, design, bidding, construction, inspection, take over, and operation. Besides, the cost of the subsequent maintenance should be considered within the construction cost. For this reason, a low-maintenance design was proposed in this work to investigate the feasibility of the post-disaster rehabilitation of the Keelung Islet wharf. The numerical model of EEMSE (Evolution Equation of Mild-Slope Equation) developed by Hsu et al. (2003) was applied to simulate the wave fields around the study coastal area. This model is able to adapt itself to local topological characteristics for a better result and has been validated by different real applications in Taiwan. The design wave conditions include winter monsoon and typhoon scenarios of the current and the 50-year-return-period status. The design wave periods and wave heights are based on the measured data at the Keelung station X. The simulated wave periods and wave heights were then applied in the Goda’s formula to calculate wave loads on the wharf structure for its security checking of sliding and tipping. Deployment of armor blocks is the most common approach for the wave energy dissipation and wharf structure protection in Taiwan according to surveys from different commercial and fishing ports. For instance, the Keelung city government budgets about NT$ 10 million per year for the deployment of armor blocks. The proposed approach, on the other hand, is economical and low-maintenance, which suggests masonry gravity design at the head of the jetty and filling up the mooring area at the root of the jetty. With this approach, the yearly deployment of armor blocks can be avoided and it can save up to NT$ 200 million for the 50-year life cycle of NT$ 4 million per year. This approach can be regarded as an alternative for the designs of subsequent maintenance or new construction plans in Taiwan.
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