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서경덕(Suh, Kyung-Duck),도기덕(Do, Ki-Deok) 한국해안해양공학회 2009 한국해안해양공학회 논문집 Vol.21 No.2
Reid and Kajiura(1957)은 해저면에 무한한 깊이의 투수층이 존재할 경우에의 파의 감쇠율을 유도하였다. 본 연구에서는 유한한 깊이의 투수층이 존재할 경우에의 파의 감쇠율을 선형파이론을 이용하여 유도하였다. 그리고 이를 확장하여 해저면에 재질이 다른 2 층 또는 3 층의 투수층이 존재할 경우에 파의 감쇠율을 제시하였다. 다음으로 이를 완경사 방정식에 적용하여, 해저면에 투수층이 존재할 경우에의 파의 투과율을 계산하였으며, 1층 투수층이 존재할 경우의 수치계산결과를 Flaten and Rygg(1991)의 적분식 방법과 비교하여 검증하였다. Reid and Kajiura(1957) has studied on the wave damping rate over a permeable bed of infinite depth. In this study, wave damping rate over a permeable bed of finite depth is derived by linear wave theory. It is then extended to derive wave damping rates over a double or triple layer, each of which consist of different material. Applying the wave damping rate to the mild slope equation, the wave transmission coefficient over a permeable bed has been calculated. The model has been certificated by comparing with the result of Flaten and Rygg(1991)'s integral equation method in the case of a single-layer bed.
소청초 종합해양과학기지 Radar 파랑 관측 데이터의 신뢰도 향상
민용침(Yong chim Min),정진용(Jin Yong Jeong),심재설(Jae Seol Shim),도기덕(Ki deok Do) 한국연안방재학회 2017 한국연안방재학회지 Vol.4 No.4
Ocean Research Stations (ORSs) is the ocean platform type observation towers and measured oceanic, atmospheric and environmental data. These station located on the offshore area far from the coast, so they can produce the data without land effect. This study focused to improve the wave data quality of ORS station. The wave observations at ORSs are used by the C-band (5.8 GHz, 5.17 cm) MIROS Wave and Current Radar (MWR). MWR is convenient to maintenance and produce reliability wave data under bad weather conditions. MWR measured significant wave height, peak wave period, peak wave direction and 2D wave spectrum, so it’s can provide wave information for researchers and engineers. In order to improve the reliability of MWR wave data, Datawell Waverider Buoy was installed near the one ORS (Socheoncho station) during 7 months and validate the wave data of MWR. This study found that the wave radar tend to be overestimate the low wave height under wind condition. Firstly, this study carried out the wave Quality Control (QC) using wind data, however the quality of wave data was limited. So, this study applied the four filters (Correlation Check, Direction Filter, Reduce White Noise and Phillips Check) of MWR operating software and find that the filters effectively improve the wave data quality. After applying 3 effective filters in combination, the RMSE of significant wave height decreased from 0.81m to 0.23m, by 0.58m and Correlation increased from 0.66 to 0.96, by 0.32, so the reliability of MWR significant wave height was significantly improved.
Single Line Theory를 적용한 안목 해변 잠제에 의한 해안선 변화 모델링
장연식(Yeon S. Chang),바스 후이스만(Bas Huisman),위베 데 보어(Wiebe de Boer),심재설(Jae seol Sim),로버트 멕컬(Robert McCall),도기덕(Ki deok Do),유제선(Je seon Yoo) 한국연안방재학회 2017 한국연안방재학회지 Vol.4 No.4
Since a submerged breakwater (SBW) was built and the beach was nourished at Anmok in the east coast of Republic of Korea at October, 2014, the shoreline in the lee of the SBW has accreted about 25 m during the first seven months after construction. The shoreline evolution showed two distinct patterns which were studied in this paper. A strong local accretion behind the submerged breakwater was observed in March 2015 and a smoother shoreline with accretion that extended up to Gangneung Harbor breakwater in May 2015. The UNIBEST coastline model (developed at Delft Hydraulics) was applied for the investigation of the observed shoreline undulation patterns which were generated by alongshore sediment transport gradients that were induced by the SBW and nourishment. Nearshore wave conditions were computed for this purpose at nine locations in the nearshore with the Delft3D-wave model. Two detailed wave scenarios with different crest height of the SBW were taken into account to represent the transmission of waves at the SBW which were validated with field measurements. The coastline model is able to reproduce the observed shoreline evolution patterns when wave transmission at the SBW is represented well, which is the case for a wave scenario with a lowered effective crest level of the SBW. Initially, accretion takes place predominantly at the northern side of the scheme, which was similar to the observed shoreline shape of the March 2015 situation. This local accretion is a result of the low sediment transport capacity behind the SBW due to sheltering of the wave energy, which initially hinders the redistribution of sediment to the South (i.e. area in-between Gangneung Harbor and SBW). After some months, a redistribution of sediment will take place behind the SBW which results in a smoother shoreline pattern which is similar to the May 2015 situation. The rate of change of the shoreline accretion is controlled by the absolute transport rates at the coast (i.e. wave energy), but is often of lesser importance since an adjustment towards a new shoreline equilibrium may take place within relatively short time scales (i.e. months to a few years). In addition to the wave energy, it was found that the relative angle of the incoming waves (α) is most relevant for the final shoreline shape. The shoreline evolution at future SWB structures may therefore be predicted by precisely estimating the α directly after construction of the SBW.