Title Wave observation and data statistical analysis in Taiwan Commercial Port
Dept Transportation Technology Research Center
Year 2024
Month 3
Price 400
Summary     The main work in 2023 includes maintenance and statistical analysis of observation data over the years at eight commercial ports marine observation stations including Taipei Port, Keelung Port, Suao Port, Hualien Port, Kaohsiung Port, Anping Port, Budai Port and Taichung Port, underwater wireless communication technology applied to feasibility assessment of the AWAC real-time observation system, and the static stability analysis of Kaohsiung Port.
    The historical wave statistical data of eight commercial ports shows that Budai Port has the smallest Hs is 0.51 m during the observation period, the wave period is mainly between 6-8 s, and the wave direction in the W-N is 56%. The maximum Hs in Taichung Port is 1.5 m, 64.5% of the wave directions are located in N-E quadrant, and nearly 50% of the wave period is 6-8 s.During the spring, the Hs of Kaohsiung Port, Anping Port and Budai Port are all less than 1 m. The Hs of Budai Port is 0.37 m, which is the smallest among the eight commercial ports, 60.4% of the wave directions in the whole season in W-N quadrant. Taichung Port has a Hs of 1.2 m, which is the highest among the 8 ports, the ratio in N-E quadrant is 74.5%. In summer, Taiwan is affected by the summer monsoon and typhoon. The Hs in Kaohsiung and Anping Ports are about 0.3 - 0.4 m higher than spring. The Hs of Keelung Port is 0.42 m, which is the lowest among the eight commercial ports, and the wave period is less than 8 s, accounting for 74.8%. The Hs of Suao Port is 1.08 m, which is the highest in the season, and the wave period is 38.8% between 6- 8 s. In autumn, the winter monsoon strengthens and becomes stable. Budai Port has the smallest Hs of 0.56 m among all ports, and 78.5% of the main wave directions are in W-N quadrant. Due to the influence of winter monsoon, Taichung Port has a Hs of 1.8 m, which is the largest among all ports, and 81.5% of the wave directions are in N-E quadrant. In winter, Taichung Port is affected by the strong winter monsoon, and the Hs increases to 2.1 m. The wave direction N-E quadrant accounts for 86.7%, and the wave period is 57.9% at 6-8 s, which is the largest in this project. The Hs increases by about 1.3 m compared with summer.
    Feasibility assessment of applying underwater wireless communication technology to AWAC real-time monitoring system, The time required for the wireless AWAC real-time monitoring system in the wake-up phase greatly affects the transmission efficiency of the modem. In the modem power consumption test, the average transmission power of the modem was up to 53.29 W, which was in line with the original equipment specification of 55 W power consumption. The large cross-section tank water communication test shows that the transmission rate of the modem under optimal conditions should be able to meet the current demand for observation data transmission every half hour. As the communication distance is lengthened, the problem of signal reflection affecting transmission efficiency still needs to be confirmed by further fine-tuning the system in actual observation areas.
    The results of the static stability analysis in Kaohsiung Port show that from 2023/6/1 00:00-2023/6/2 12:00, due to the influence of the outer circulation of Typhoon Mawar, the Hs in both the inner and outer ports were relatively large. However, from 2023/6/2 13:00-2023/6/10 23:00, the Hs outside the port is about 0.6-1.2 m, and the Hs at each static stability monitoring station in the port is less than 0.2 m. The possible reason for this phenomenon is that from 2023/6/1 00:00-2023/6/2 12:00, the main wind (wave) direction in the open sea is NNW, and the offshore embankment of cannot effectively shield the port, causing the internal Hs too high, causing instability in the port. During Typhoon Khanun, the maximum Hs outside the port was 3.93m, and the static stability measuring station inside the port was less than 0.5 m. It is estimated that the main wind (wave) direction formed by the outer circulation of Typhoon Khanun is NW. The offshore embankment can effectively block the waves, so the port is still in a relatively stable state.
    The long-term ocean observation data and application results of commercial ports in 2023 can provide Maritime Port Bureau. MOTC, Taiwan International Ports Coporation, Ltd and other relevant units as reference for ship navigation, harbor planning and port construction applications. It can also be used as a reference for planning, design and research by government agencies, engineering consultants and academic institution.
Post date 2024/03/28
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