[논문]A Study on the Allowable Range of Overhanging Berthing at the Port of Ulsan

Kim, Seungyeon; Yu, Yongung; Lee, Yunsok

doi:10.7837/kosomes.2019.25.3.313

A Study on the Allowable Range of Overhanging Berthing at the Port of Ulsan 원문보기

海洋環境安全學會誌 = Journal of the Korean society of marine environment & safety, v.25 no.3, 2019년, pp.313 - 319

Kim, Seungyeon (Division of Navigation Science, Mokpo National Maritime University) , Yu, Yongung (Graduate school of Korea Maritime and Ocean University) , Lee, Yunsok (Division of Ship Navigation, Korea Maritime and Ocean University)

Abstract ▼ AI-Helper

As vessels become larger and competition between ports intensifies, there has been an increase in the number of cases where vessels that exceed the available berths are berthed at the pier. Therefore, there has been an increase in the number of cases in which the bow or stern of a ship is projected and moored. The risk of overhanging berthing is that mooring safety can be compromised because it is not possible to connect the bow and stern mooring line to the ship properly. In addition, collision accidents may occur between moving vessels if the view of a vessel moving in the port is obstructed. Therefore, in this study, the simulation of mooring safety was performed according to the overhanging range in Piers No. 6 and 7 in Ulsan's main port to propose the overhanging limit and operational standards according to each ship. As a result of the assessment, 30,000 DWT bulkers are able to overhang up to 0.75B, and 50,000 DWT bulkers can overhang up to 0.50B. The results of this study are expected to be used as basic data for setting the allowable overhang limit, as well as clear usage criteria for safe unloading operations.

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문제 정의

This study investigated the current status of the vessels in Ulsan Harbor during the last five years. Ships for berthing and ships used excessively were selected.

제안 방법

In order to determine a ship’s overhanging limit, the overhanging condition of the aft part of the ship was modeled to 0.25, 0.50, and 0.75 scale of breadth.
In order to select the target vessels, we analyzed the arrival of vessels by size (GT) for five years (2013 to 2017).
In this way, studies are being conducted to estimate the level of mooring safety, ship's motion, and the loading limits of wave height according to various environmental externals such as wind, waves, long-period waves, and tsunamis both at home and abroad.
Ship motion occurs when external forces such as waves, wind, and current act on a vibration system composed of a hull and mooring system. The evaluation factors for this simulation are the tension acting on the mooring line, the load acting on the bollard, and the reaction force of the fender. In addition, safety evaluations during loading are carried out in order to evaluate whether or not 6-DOF in motion for cargo handling operations are possible by an external force.
The results of this study can be used as a set of basic data to propose criteria for the allowable margin of overhang per port. In order to prevent accidents involving overhanging moored vessels, it is held that overhanging simulations should be performed in consideration of the characteristics of the target pier and ship.
Ships for berthing and ships used excessively were selected. The simulated mooring safety assessment was performed according to the overhanging length of the ship when the ship was in overhanging position. Accordingly, the overhanging limit range and operating standards were proposed.
As vessels become larger and competition intensifies among ports, the number of vessels exceeding the number of berths capable of berthing is rising. Therefore, in this study, mooring safety simulations were carried out according to the overhanging range by selecting pier No. 6 at Ulsan Port, and the following conclusions were drawn.
2 kts. Therefore, the strongest flood currents, which were evaluated so as to influence the mooring safety of the target piers, were selected for the simulation.

대상 데이터

In addition, the target vessels selected were the 30,000 DWT bulker, corresponding to the berthing capacity vessel in the port’s basic plan of wharf No. 4., and the 50,000 DWT bulker, which is berthed frequently.

이론/모형

This simulation was performed using OPTI-MOOR SW (Ver. 6.4.1) of TTI (Tension Technology International). OPTI-MOOR is a linear analysis program, a simple and accurate modeling application compared to other mooring safety analysis programs.

성능/효과

(2) As per the results of the mooring safety assessment when mooring a 50,000 DWT bulker, when the stern is overhanging by 0.50B, it is derived that the value of sway is 0.96 m, approaching the upper limit value of 1.0 m.

참고문헌 (5)

Cho, I. S., K. Y. Kong and Y. S. Lee(2006), A time domain analysis of moored ship motions considering tsunami resonant effects, Proceeding of the Spring Conference on Korean Institute of Navigation and Port Research, Korean Institute of Navigation and Port Research, Vol. 30, No. 1, pp. 191-197.
Cho, I. S.(2017), Behavior Analysis and Control of a Moored Training Ship in an Exclusive Wharf, Journal of the Korean Society of Marine Environment & Safety, Vol. 23, No. 2, pp. 139-145.

원문보기 상세보기
International Transport Forum(2015), The Impact of Mega-Ships: Case-Specific Policy Analysis, Paris: International Transport Forum.
Kwak, M. S. and Y. H. Moon(2014), A study on estimation of allowable wave height for loading and unloading of the ship considering ship motion, Journal of the Korean Society of Civil Engineers, Vol. 34, No. 2, pp. 873-883.

원문보기 상세보기
Rosa-Santos, P., F. Taveira-Pinto and F. Veloso-Gomes(2014), Experimental evaluation of the tension mooring effect on the response of moored ships, International Journal of Coastal Engineering, 85(2014), pp. 60-71.

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A Study on the Allowable Range of Overhanging Berthing at the Port of Ulsan 원문보기

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A Study on the Allowable Range of Overhanging Berthing at the Port of Ulsan 원문보기

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