Title Hybrid wave calculation using modular model and numerical simulation for main harbors of Taiwan (3/4)
Dept Transportation Technology Research Center
Year 2016
Month 3
Price
Summary Design waves for marine structures are commonly determined by extreme analysis on long-term annual maximum wave data. However insufficient data are available for extreme analysis. The problem of insufficient data samples was solved by supplementation of simulated waves which were calculated by ANN wave simulation model developed by the Harbor and Marine Technology Center of Taiwan (IHMT). The accuracy of these wave data samples for extreme analysis should be promoted considering alternative approach and the effect on wave climate by recent global climate change. This project aims to not only upgrade the ANN wave simulation model for the Anpin and Kaohsiung Harbor, but also to develop a new M5 wave model. Comparison on the simulated result by ANN and M5 models with observed data shows the prediction accuracy and applicability of both wave models. ANN model is more suitable for real-time prediction and extreme sample calculating. A numerical wave model of MIKE 21 SW will be used to calculate waves at both Anpin and Kaohsiung harbors by input high-resolution wind field which re-analysis by WRF model.

Four extreme samples, which are, ANN results, observed data, numerical wave model results, and M5 model results were sampled by annual max method, the extreme analysis was used to estimate design wave of each sample. Responding to the issue of the impact of climate change on marine works proposed by World Association for Waterborne Transport Infrastructure (PIANC), Several of trend detecting methods(linear regression、Seasonal Kandall、EMD) are used to determine the trend of long-term observed typhoon’s waves of IHMT. Considering the climate change, applicable standard procedure for design wave was suggested by this research.

The results of this study not only can provide harbor bureau and interrelated department to re-examine the design wave, but predict the wave height when typhoon invade Taiwan in the future. The long-term typhoon and wave trend analysis can apply to engineering designing.
Post date 2016/05/06
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