부산항 신항 부두 안벽 전면 퇴적원인 분석 연구
A Study on the Causes of Sedimentation at the Quay Wall in Busan New Port
0
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
부산항 신항 건설 이후 지속적인 선박 대형화로 항로 증심준설을 수행하였으나 최근 안벽 전면 퇴적현상이확인되어 이에 대한 원인을 단순히 낙동강 하구역에서 유입되는 부유사의 영향이라고 초기 가정하였다. 따라서 낙동강 하구역과 인접한 연결잔교를 중심으로 해양물리조사, 해수유동 및 퇴적물 이동 수치모의, 부산항 신항 항내 및연결잔교에서 눌차도 사이의 수심측량을 수행하였다. 수심측량 결과, 항내 일정구역에 대해 2017년과 2022년의 항내순 퇴적량은 2,054 m 3이었고, 항로의 침식량이 박지의 퇴적량과 차이가 없었으나 퇴적물 이동 수치모의에서는 연결잔교를 제외하고 모든 영역에서 침식이 발생하고 실측된 지형변화량보다 연간 최대 5배 적게 퇴적되어 신항 안벽전면 퇴적의 직접적인 원인이 아닌 것으로 판단되었다. 특히, 신항 중앙부 항로의 계획 수심인 D.L.()17 m보다1.5 m 더 침식되는 영역이 넓게 분포되고 안벽으로 퇴적되는 현상은 초기 가정이 맞지 않음을 나타낸 것이다. 따라서 신항 해저에 영향을 줄 수 있는 마지막 인자인 대형선박에 대한 세굴을 추가로 검토하였으며, 선박 후류속도에의한 해저 세굴식을 적용하였다. 그 결과, 입항 가능한 최대선박 240,000톤일 경우 선박 후류속도에 의한 최대 세굴심도가 1.5 m 발생되고 세굴된 부유사는 항로의 법선방향으로 이동 가능함을 확인하였다.
Abstract
Since the construction of the Busan New Port, dredging has been performed to deepen the navigation channel due to the continuous enlargement of vessels. However, since the recent confirmation of the phenomenon of sedimentation across the entire quay wall, it was initially assumed that the cause was simply the influence of suspended sediment flowing in from the Nakdong River Estuary. Therefore, a marine physical survey and numerical simulation of seawater flow and sediment movement were conducted centered on the Pier bridge to the Nakdong River Estuary, and a bathymetric survey was conducted within the Busan New Port and between the Pier bridge and Nullcha-do. As a result of the bathymetric survey, the net sedimentation within the port in a certain area of the port in 2017 and 2022 was 2,054 m<sup>3</sup>, and the amount of erosion in the fairway was no different from the amount of sedimentation in mooring basin. However, in the numerical simulation of sediment movement, erosion occurred in all areas except the Pier bridge, and the annual deposition was up to 5 times less than the actually measured topographic change, so it was determined that it is not a direct cause of the sedimentation across the entire quay wall of the New Port. In particular, the area that is eroded 1.5 m more than the planned depth of D.L.(-)17 m in the central part of the new port is widely distributed and the phenomenon of deposition on the quay wall shows that the initial assumption is not correct. Therefore, the scour for large vessels, the last factor that can affect the seabed of the new port, was additionally examined, and the seabed scour equation by the ship's wake speed was applied. As a result, it was confirmed that the maximum scour depth by the ship's wake speed is 1.5 m in the case of the largest vessel that can enter the port, 240,000 tons, and the scoured floating sand can move in the normal direction of the route.
참고문헌 (12)
- Fuehrer, M., "Criteria for Dimensioning the Bottom and Slope Protections and for Applying the New Methods of Protecting Navigation Canals", Section I, Subject 1 of Proc. 25th International Navigation Congress, PIANC-Congress, Permanent International Association of Navigational Congresses (PIANC), pp.29~50 (1981)
- Hamill, G.A., "Characteristics of the screw wash of a manoeuvring ship and the resulting bed scour", Ph.D., Civil Engineering, pp.1987
- Hayes, D. F., "Propwash impacts on water quality around dredging and other marine construction activities", Proc. of the 30th Annual WEDA Conf., pp.6~9 (2010)
- Hong, N.S., "Morphological change in seabed surrounding Jinwoo-Island due to construction of New Busan Port-qualitative evaluation through numerical simulation", J. Ocean Eng. Technol, 32(3), pp.192~201 (2018)
- Fine-sediment erodibility in Lake Okeechobee, Florida, "Hwang, K. N.", Coastal and Oceanographic Engineering Dept., Univ. of Florida, ~, pp.UFL (1989), COEL-89[DOI]
- Kastner, S., "Ferry vessel propeller wash effects on scour at the Kingston ferry terminal, WA, USA", 15th Triennial Int. Conf., pp.500~511 (2019), ASCE
- Lee, Y. B., "Analysis of seawater transport based on field measurements at Pier-Bridge between Busan New-Port and the Nakdong River Estuary", Journal of the Korean Society of Marine Environment and Safety, 14(3), pp.189~195 (2008)
- Interim Report for the Upper Mississippi River-Illinois waterway system navigation study: Physical forces near commercial tows, "Maynord, S.T.", USACE, Engineer Research and Development Center, ~, pp.ENV Report 19 (2000)
- Mehta, A. J., "Estuarine cohesive sediment dynamics" (1986)
- Stoschek, O., "Sediment Resuspension and seabed scour induced by ship-propeller wash", PIANC World Congress 2014, pp.1~17 (2014)
- Tanimoto, T., "Settling velocity of suspended particles in Osaka Bay and Etauchi Bay", Umi no Kenkyu, 3, pp.13~20 (1994)
- Wang, P. F., "Modeling migration of sediment and Sorbed contaminants resuspended by ship docking in San Diego Bay", Proc. 4th International Conf. on Hydroscience & Engineering (2000)