Downtime Analysis for Pohang New Harbor through Long-term Investigation of Waves and Winds

Jeong, Weon Mu; Ryu, Kyong-Ho; Baek, Won-Dae; Choi, Hyukjin

doi:10.9765/kscoe.2011.23.3.226

Cited by 11 publications

(6 citation statements)

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“…In the figure, small wavy undulations are observed in all the curves over the frequency ranges corresponding to infragravity waves. According to previous studies on wave observation at other locations on the Korean east coast [22][23][24], such undulations either have different patterns depending on the locations or are not even observed at some locations. For this reason, these undulations are presumed to be caused by regional effects such as reflections from the coast, which explains why the undulations are very similar for all curves.…”

Section: Separation Period Of Infragravity Wavesmentioning

confidence: 99%

“…Considering this, it is quite natural that the magnitude of infragravity waves can be different depending on the choice of the separation period [8,[22][23][24]. In fact, the heights and periods of infragravity waves observed at Sokcho beach on the Korean east coast were apparently different depending on the use of different separation periods of 20, 25 and 30 s. In contrast, the upper limit, or higher cutoff period of infragravity waves, had little decisive influence on the magnitude of infragravity waves [25].…”

Section: Introductionmentioning

confidence: 99%

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On the Separation Period Discriminating Gravity and Infragravity Waves off Gyeongpo Beach, Korea

Jeong

Chang

et al. 2020

JMSE

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Although there have been a number of studies investigating fundamental characteristics of infragravity waves in coastal zones, a proper method of deciding period ranges that are associated with gravity or infragravity waves remains uncertain. In this study, we proposed an empirical method of separating spectral energies of gravity and infragravity waves by analyzing the wave observation data acquired off Gyeongpo beach on the Korean east coast. The fundamental principle of the suggested method is to represent the separation period discriminating gravity and infragravity waves as a function of the significant wave period, rather than a fixed value that was conventionally applied in previous studies. As a consequence of using the new method, the relationships between heights and periods of gravity and infragravity waves were more clearly identified.

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Section: Separation Period Of Infragravity Wavesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

On the Separation Period Discriminating Gravity and Infragravity Waves off Gyeongpo Beach, Korea

Jeong

Chang

et al. 2020

JMSE

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“…In this study, the CGWAVE model is applied to Pohang New Harbor in order to simulate harbor resonance and to verify the model against field measurement wave data (Jeong et al, 2011). The simulation domain is 13.5 km in the offshore direction and 9.5 km in the longshore direction.…”

Section: Numerical Simulation Conditionsmentioning

confidence: 99%

Computer Simulation of Moored Ship Motion Considering Harbor Resonance in Pohang New Harbor

Kwak¹,

Pyun²

2013

Ports 2013

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This paper proposes a computational method for estimating the effect that harbor resonance has on moored ship motion. The computation of harbor resonance used the CGWAVE model, and the computation of moored ship motion used the three-dimensional Green's function method. This method was verified with field motion measurement data from actual moored ships and wave field data and down time record data from Pohang New Harbor. The resonance periods obtained from wave field data in Pohang New Harbor were 80, 33, 23, and 8 min, which were the long waves, and 42, 54, and 60 s, which were the infra-gravity waves inside the harbor slip. The simulation results for harbor resonance were compared to the actual wave field data. This study investigated whether harbor resonance has an effect on moored ship motion using simulated results of ship motion both with and without harbor resonance. In the case of harbor resonance included, moored ship motion increased by 12-400% when compared with the results without harbor resonance included. We found that harbor resonance has a greater effect on the surge and heave motion of a large-sized ship and on the roll and the yaw motion of a small-sized ship.

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“…. 따라서 이런 단주기파의 항내 침입을 효 과적으로 차단할 경우 항내정온도 문제가 개선될 수 있을 것으 로 제안되었다 (Jeong et al, 2011;Pohang Regional Maritime Affairs andPort Office, 2010, 2012 (Fig. 3(b)).…”

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Evaluation of Harbour Tranquility Improvement in Pohang New Port by Detached Breakwater

Ryu¹,

Jeong²,

Kwon³

et al. 2020

J Korean Soc Coast Ocean Eng

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Since the construction of Pohang New Port, the problems of the low harbor tranquility caused by decreasing port operation rate has been continuously reported. In order to improve the harbor tranquility, a detached breakwater (DB) has been constructed outside the outer breakwater of Pohang New Port in 2018~2020. In this study, the effectiveness of the DB was proved by comparing the reduction rates of wave heights that were observed before and after the construction of the DB. First, the observed data were compared with the numerical model results available from a previous study, and the model data showed reasonable agreement with measured data at 3 out of 4 locations inside the port. The discrepancy in one of the locations was because the model could not accurately calculated the effect of wave interference in the inner corner of the port. The observation data showed excellent results that the number of waves that exceeded 0.3 m, the critical value to reach desired harbor tranquility, was significantly reduced after the construction of the DB. In addition, the reduction rate, the ratio of wave heights between outside and inside of the port, was decreased after the DB construction, which proved that properly designed coastal structures such as DB in this study could be effective in improving the port tranquility. The results of this study can be usefully applied for solving problems in similar cases.

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Downtime Analysis for Pohang New Harbor through Long-term Investigation of Waves and Winds

Cited by 11 publications

References 0 publications

On the Separation Period Discriminating Gravity and Infragravity Waves off Gyeongpo Beach, Korea

On the Separation Period Discriminating Gravity and Infragravity Waves off Gyeongpo Beach, Korea

Computer Simulation of Moored Ship Motion Considering Harbor Resonance in Pohang New Harbor

Evaluation of Harbour Tranquility Improvement in Pohang New Port by Detached Breakwater

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