부산신항역 매립 및 준설에 따른 정온도 해석

Abstract

Recently the first stage of construction for Busan New Port emerged over the sea surface at the north container terminal site. With this, there are lot of discussions and debates on increasing the water depth at the approaching channel and mooring basin from the existing 15m to 18m by dredging work in order to be able to serve over 12,000TEU containership, and at the same time, correction to the reclamation plan of shipbuilding complex at the mouth of the new port and hinterland at the part of Undong Bay of the new port site. Although the harbor and coastal boundaries are protected from the effects of the open ocean by natural coastal islands and two new breakwaters, the approach channel is wide enough to get external wind and wave forces. The inner navigation channel, commences at the gap formed by the outer breakwaters, is long and wide extending to the narrow bays of Ungdong and Angol before reclamation. The openings at the entrance was changed due to the removal of the shipbuilding complex plan and thus, it is necessary to analyze basin responses.

For better understanding and analysis of wave transformation process where the change of a wide water basin appear due to on-going reclamation and dredging works, we applied the spectral wave model including wind effect to the related site, together with the energy balance models. This study summarizes comparisons of harbor responses predicted by several numerical predictions obtained at Busan new port site. Numerical model investigations were conducted for the original port plan and the several corrected plans.

Since the attack of typhoon "Maemi" in 2003, it is expected that the design wave parameters for coastal and harbor structures in this area would be somewhat changed and so the extreme wave condition at each terminal and tranquility of berthing area does, too. Therefore, it is necessary to analyze the tranquility at each berth. Hence in this study, we constructed several numerical models for these conditions and performed simulation together with the circulation model simulation, compared with the field data collected. The result showed the increase of the harbor response part of the basin but not severe condition. However, a certain location needs to be prepared for the rough sea condition when a severe typhoon hit the site.

In order to calculate available berth operation ratio in Busan New port, it is necessary to carry out numerical simulation with different wave conditions for ordinary waves. These are required when estimating the harbour calmness or the net working rate of cargo handling for each berth. The waves obtained by statistically, processing data based on either actual measurement or hindcasting, were introduced to estimate the averaged relative wave heights, critical deepwater waves for the limit of cargo handling work and mooring at each berth, and occurrence of critical waves at each berth and annual ratio of available berth operation. The estimation shows 1% reduction on the berth operation ratio comparing with that of the first port design plan. Furthermore, calculation and field measurement of the ship generated waves at the Busan New port were introduced for the future analysis of the dynamic berth operation in this area.