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RISS 인기검색어
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- 저자 : 손동휘(Donghwi Son) (검색결과 3 건)
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단기 태·폭풍 기인 잠제 배후의 Piling-up 현상 평가
손동휘(Donghwi Son),유제선(Jeseon Yoo),김무종(Mujong Kim) 한국연안방재학회 2018 한국연안방재학회지 Vol.5 No.4
It is generally known that submerged breakwaters can reduce the incoming wave energy without disturbing the beach scenery. However, a submerged breakwater is also able to cause a setup of the sea level in the protected area which is also called as water piling-up. Since the piling-up can result in longshore currents, sediment transports, and unexpected beach erosion, understanding about the piling-up process is required prior to designing the nearshore structures. In this study, the water piling-up behind a submerged breakwater is assessed in the time of storm events. For the study area, Anmok beach in Gyeonso-dong, Gangwon-do is selected. 1-year, 5-year, 10-year, and 50-year return-values were derived from Peaks-Over-Threshold(POT) method and those are applied as offshore boundary conditions for the numerical simulation. The numerical results of the piling-up were assessed with regard to the wave steepness and the height of the submerged breakwater. With increase of both significant wave height and the height of the submerged breakwater, the piling-up parameter is also increased which can lead to erosion of dry beach behind the structure.
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한반도 주변 해역에서의 MetOp-B와 Jason-2 인공위성 해상풍 검증
손동휘(Donghwi Son),전기천(Kicheon Jun),심재설(Jae-Seol Shim),권재일(Jae-il Kown),유제선(Jeseon Yoo) 한국연안방재학회 2020 한국연안방재학회지 Vol.7 No.4
In the last few decades, many studies on estimation of sea surface winds using satellites have been increasingly carried out with advancement of remote sensing technology. In prior to the use of satellite data for physical analysis, validation and calibration of the satellite raw data should be conducted. Most of the previous validation studies have mainly focused on the offshore data which were collected 50km or more away from the coastline. This is to remove the effect of land interference from the radar signal data. In this study, a method of validating wind speed data based on wind direction is proposed to improve the validation, in particular, for the satellite data collected in coastal area, intending to enhance the utilization of the satellite data which is adjacent to the land. MetOp-B and Jason-2 data were considered as satellite dataset. For the validation of the satellite data, the in-situ measurements from Korea Meteorological Administration(KMA) and Korea Hydrographic and Oceanographic Agency(KHOA) were used. Reduced Major Axis(RMA) regression method was applied as regression analysis between the satellite wind data and in-situ measurements. As a general results, when wind speeds with wind directions from the offshore were compared between the satellite and in-situ buoy data, the correlations were higher and the root mean square errors were lower compared to the wind blows from the land.
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수치모델링을 통한 안목해안에서 계절에 따른 지형변동 패턴 분석
김무종(Mujong Kim),손동휘(Donghwi Son),유제선(Jeseon Yoo) 한국연안방재학회 2018 한국연안방재학회지 Vol.5 No.4
In recent years, coastal areas have been suffering from coastal erosion, such as destruction of coastal roads and military facilities. In this study, the Delft3D model was used to analyze the sediment transport pattern due to seasonal characteristics of summer and winter waves in Anmok beach of the East coast. Typhoon and high waves are mainly are coming from ENE direction in the summer season and the flows occur in the northward. In winter, high waves are incident from NE and the flows occur in the southward. These seasonal patterns were simulated by using Delft3D model. As for model input, reanalysis wave data of the past 38 years were used, and the seasonal patterns were analyzed by dividing the whole year into summer and winter season. The grid point of the 38 year reanalysis data is far from the Anmok beach, so the three model grid systems (wide grid -> intermediate grid -> detailed grid) are constructed. Most of the flows in the NW direction occurred in summer, but erosion and deposition was alternated along the coastline. In winter, sediment was deposited near Gangnung Port due to the southern flow and the southern port. Strong winter waves compared to summer tend to cause deposition around Gangnung Port throughout the year.
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