서남해 해상기상탑의 설계 및 설치

문채주(Chae-Joo Moon),장영학(Young-Hak Chang),정문선(Moon-Seon Jeong),주효준(Hyo-Joon Joo),권오순(O-soon Kwon),곽대진(Dae-Jin Kwag),정권성(Gwon-Seong Jeong) 한국해양환경·에너지학회 2013 한국해양환경공학회 학술대회논문집 Vol.2013 No.11

해상기상탑은 해상풍황자원 및 해양환경데이터를 측정하고 있으며, 국내의 경우 해모수 1호기를 설치하여 서남해안의 풍황자원을 측정하고 있다. 본 논문에서는 한반도 남쪽방향으로 갈수록 풍황자원이 높다는 평가에 근거하여 신안군과 진도군 사이의 해역에 적용하고자 해상기상탑 Ocean MAST를 설계하여 설치하였다. The Offshore mast measures the resolution wind characteristic resource and Marine Environment data, And it sets up 1 expiration of Haemosu in the case of the interior of a country and measures the wind characteristic resource of the Southwest Coast. In this paper, in order to apply to the sea area between Sinan-gun and Jindo County based on the evaluation that the wind characteristic resource is high for the Korean south direction over the time, the Offshore mast Ocean MAST was designed and it set up.

해상기상탑 설계에 관한 연구

문채주(Chae-Joo Moon),장영학(Young-Hak Chang),박태식(Tae-Sik Park),정문선(Moon-Seon Jeong),주효준(Hyo-Jun Joo),권오순(O-Soon Kwon),곽대진(Dae-Jin Kwag),정권성(Gwan-Seong Jeong) 한국태양에너지학회 2014 한국태양에너지학회 논문집 Vol.34 No.2

A meteorological(met) tower is the first structure installed during the planning stages of offshore wind farm. The purpose of this paper is to design the met tower with tripod bucket type support structure and to install the sensors. The support structure consist of a central steel shaft connected to three cylindrical steel suction buckets which is more cheaper than monopile or jacket type. And the remote wind condition sensors and marine monitoring equipment, including adcp, pressure type tide gauge, wave height sensors, and scour sensors, remote power supply are installed. The manufactured met tower constructed on sea area which is in front of Gasa island. All of functions of met tower showed normal operation conditions and the wind data got by remote data collection system successfully.

평활화 기법을 이용한 파랑 첨두주기 최적 추정

이욱재,이병욱,고동휘,조홍연 한국해안,해양공학회 2022 한국해안해양공학회 논문집 Vol.34 No.6

In this study, a smoothing method was applied to improve the accuracy of peak wave period estimation using the water surface elevation observed from the Oceanographic and Meteorological Observation Tower located on the west coast of the Korean Peninsula. Validation of the application of the smoothing method was performed using variance of the surface elevation and total amount wave energy, and then the effect on the application of smoothing was analyzed. As a result of the analysis, the correlation coefficient between variance of the surface elevation and total amount wave energy was 0.9994, confirming that there was no problem in applying the method. Thereafter, as a result of reviewing the effect of smoothing, it was found to be reduced by about 4 times compared to the confidence interval of the existing estimated spectrum, confirming that the accuracy of the estimated peak wave period was improved. It was found that there was a statistically significant difference in probability density between 4 and 6 seconds due to the smoothing application. In addition, for optimal smoothing, the appropriate number of smoothings according to the significant wave height range was calculated using a statistical technique, and the number of smoothings was found to increase due to the unstable spectral shape as the significant wave height decreased. 본 연구에서는 한반도 서해안에 위치한 해상기상관측타워에서 관측된 수면변동자료를 이용하여 첨두주기산정의 정확도 향상을 위한 평활화 기법을 적용하였다. 평활화 기법 적용에 대한 검증은 파형의 분산값과 관측 자료의 에너지 총량을 통해 수행하였으며, 이후 평활화 적용에 대한 영향을 분석하였다. 분석결과, 파형의 분산값과 관측자료의 에너지 총량의 상관계수는 0.9994로 나타났으며, 해당 기법 적용에 문제가 없음을 확인하였다. 이후, 평활화영향 검토를 수행한 결과, 기존 추정 스펙트럼의 신뢰구간에 비해 최대 26% 감소하는 것으로 나타남으로서, 추정되는 첨두주기의 정확도가 향상됨을 확인하였다. 평활화 적용으로 인하여 4~6초 사이에서 확률밀도는 통계적으로 유의미한 차이가 발생하는 것으로 나타났다. 또한, 최적 평활화를 위해 통계적 기법을 이용하여 유의파고 범위에 따른적정 평활화 개수를 산정하였으며, 평활화 개수는 유의파고가 작아짐에 따라 불안정한 스펙트럼 형상에 의해 증가하는 것으로 나타났다.

국내 서해안 파랑 관측자료를 이용한 대표주기 산정 및 최적 확률밀도함수 추정

이욱재(Uk-Jae Lee),조홍연(Hong-Yeon Cho),박진호(Jin Ho Park),고동휘(Dong-Hui Ko) 한국해안해양공학회 2023 한국해안해양공학회 논문집 Vol.35 No.6

본 연구에서는 서해안 해상기상타워 2기에서 관측된 수면변동자료를 이용하여 해양특성을 구분하는 주요 인자인 첨두주기 T<SUB>p</SUB>와 평균주기 T<SUB>02</SUB>와 T<SUB>m-1, 0</SUB>를 산정하고 이상자료의 비율, 상관관계 분석 및 최적 확률밀도함수를 추정하였다. 산정된 대표주기 중 첨두주기의 경우, 이상 자료의 비율은 각각의 지점에서 5.73 %, 0.67 %로 나타났으며, T<SUB>02</SUB>는 4.35%, 0.01%, T<SUB>m-1, 0</SUB>는 2.82%, 0.03%로 나타났다. 한편, T<SUB>02</SUB>와 T<SUB>p</SUB> 사이의 관계를 분석한 결과 각 지점별로 0.53, 0.63의 관계로 산정됐으며, T<SUB>m-1, 0</SUB>와 T<SUB>p</SUB>의 관계는 각각 1.15, 1.32로 나타났다. T<SUB>02</SUB>와 T<SUB>m-1, 0</SUB>는 서로 1.18, 1.22의 관계를 보이고 있었다. 산정된 대표주기의 최적 확률밀도함수를 추정한 결과, Tp는 각각의 지점에서 ‘Lognormal’, ‘Normal’ 분포를 따르고 있었으며, T<SUB>02</SUB>는 ‘Gamma’, ‘Normal’ 분포, T<SUB>m-1, 0</SUB>는 각각 ‘Log-normal’, ‘Normal’ 분포가 우세한 것으로 나타났다. 이러한 결과는 서해안을 대상으로 수행되는 파랑 분석에 기초자료로 사용될 수 있을 것으로 판단된다. In this study, the peak wave period T<SUB>p</SUB> and mean wave period T<SUB>02</SUB> and Tm<SUB>-1, 0</SUB>, which are major parameters for classifying ocean characteristics, were calculated using water surface elevation data observed from the second west coast oceanographic and meteorological observation tower. In addition, the ratio of abnormal data, correlation analysis, and optimal probability density function were estimated. In the case of T<SUB>p</SUB> among the calculated representative periods, the proportion of abnormal data was 5.73% and 0.67% at each point, and T<SUB>02</SUB> was 4.35% and 0.01%. T<SUB>m-1, 0</SUB> was found to be 2.82% and 0.03%. Meanwhile, as a result of analyzing the relationship between T02 and T<SUB>p</SUB>, the relationship was calculated to be 0.53 and 0.63 for each point. The relationship between T<SUB>m-1, 0</SUB> and T<SUB>p</SUB> was 1.15 and 1.32, respectively, and T<SUB>02</SUB>, T<SUB>m-1, 0</SUB> was 1.18 and 1.22. As a result of estimating the optimal probability density function of the calculated representative period, T<SUB>p</SUB> followed the ‘Log-normal’ and ‘Normal’ distributions at each point, and T<SUB>02</SUB> was ‘Gamma’, ‘Normal’ distribution and T<SUB>m-1, 0</SUB> showed that ‘Log-normal’ and ‘Normal’ distribution were dominant, respectively. It is decided that these results can be used as basic data for wave analysis conducted on the west coast.

Installation of Meteorological Mast for the Test Bed of Offshore Wind Power

유무성(Ryu, Moosung),강금석(Kang, Keumseok),김지영(Kim, Jiyoung),이준신(Lee, Junshin) 한국신재생에너지학회 2011 한국신재생에너지학회 학술대회논문집 Vol.2011 No.05

The final site of offshore wind power plant should be decided by comprehensive examination of various conditions such as wind resource, sea depth, geology, grid connection, social circumstance and environmental issue. Wind condition is typically regarded as the most important factor because wind energy increases in proportion to wind velocity and it directly relates to the amount of power output, efficiency of power plant and profitability. Advanced countries in the offshore wind power sector such as Denmark, UK and Germany, they are analyzing wind resource accurately by installing the meteorological mast in the ocean in order to get the optimal type of wind turbine and maximum generation efficiency. Also, it is made much of designing offshore power plant on the basis of actual measurement by met-mast and those wind farms have a chance to get the loan with reduced interest rate in project financing. In Korea, the HEMOSU-1 is installed in the ocean around Wido island to analyze wind resource of test bed of 100MW offshore wind power on october last year. This paper deals with the design and construction procedure of the first met-mast in Korea and also shows the site characteristics of test bed. Therefore, this paper will give useful information to local governments and private business sector who are trying to construct offshore wind farm and it can also be a good reference for the following projects of meteorological mast in near future.

Suction Bucket Technology를 활용한 해상풍력발전기 지지구조물 설치

이태환(Tae Hwan Lee) 한국신재생에너지학회 2018 한국신재생에너지학회 학술대회논문집 Vol.2018 No.11