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Journal of Korean Society of Coastal and Ocean Engineers > Volume 31(6); 2019 > Article
J Korean Soc Coast Ocean Eng 2019;31(6): 423-433. doi: https://doi.org/10.9765/KSCOE.2019.31.6.423
서남해에서 해상풍력구조물의 건설에 의한 해저지형의 변화예측
정승명1, 권경환1, 이종섭2, 박일흠1
1전남대학교 해양기술학부
2부경대학교 토목공학과
Prediction of Seabed Topography Change Due to Construction of Offshore Wind Power Structures in the West-Southern Sea of Korea
Seung Myung Jeong1, Kyung Hwan Kwon1, Jong Sup Lee2, Il Heum Park1
1School of Marine Technology, Chonnam National University, 50, Daehak-ro, Yeosu, Jeonnam 59626, Korea
2Department of Civil Engineering, Pukyong National University
Corresponding author: Il Heum Park ,Tel: +82-61-659-7152, Fax: +82-61-659-7159, Email: parkih@chonnam.ac.kr
Received: November 22, 2019;  Revised: December 17, 2019.  Accepted: December 20, 2019.
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ABSTRACT
In order to predict the seabed topography change due to the construction of offshore wind power structures in the west-southern sea of Korea, field observations for tides, tidal currents, suspended sediment concentrations and seabed sediments were carried out at the same time. These data could be used for numerical simulation. In numerical experiments, the empirical constants for the suspended sediment flux were determined by the trial and error method. When a concentration distribution factor was 0.1 and a proportional constant was 0.05 in the suspended sediment equilibrium concentration formulae, the calculated suspended sediment concentrations were reasonably similar with the observed ones. Also, it was appropriate for the open boundary conditions of the suspended sediment when the south-east boundary corner was 11.0 times, the south-west was 0.5 times, the westnorth 1.0 times, the north-west was 1.0 times and the north-east was 1.0 times, respectively, using the time series of the observed suspended sediment concentrations. In this case, the depth change was smooth and not intermittent around the open boundaries. From these calibrations, the annual water depth change before and after construction of the offshore wind power structures was shown under 1 cm. The reason was that the used numerical model for the large scale grid could not reproduce a local scour phenomenon and they showed almost no significant velocity change over ± 2 cm/s because the jacket structures with small size diameter, about 1 m, were a water-permeable. Therefore, it was natural that there was a slight change on seabed topography in the study area.
Keywords: offshore wind power, bottom topography change, suspended sediment concentration, jacket type structures, large scale grid numerical model
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