위치기반의 간이형 해양파고 관측 시스템 연구

박상현,박용팔,배동진,김진술,박종수 한국지식정보기술학회 2018 한국지식정보기술학회 논문지 Vol.13 No.6

In this paper, we propose a location-based simplified oceanographic surveying system. The simplified oceanographic observation system consists of a device for observing the ocean wave and a monitoring server for storing information based location. The simplified type of ocean wave surveying equipment is a small type, and it can be easily installed and deployed on ships and light buoys. Ocean wave observation equipment consists of a data logger, acceleration sensor, GPS and WCDMA module. The oceanic wave observation equipment operates at low power and physically cuts off power by using RTC when not observing. The power supply uses an external power source and can be used by attaching it to a ship or light buoy which is capable of using power at sea. The simple marine digger uses GPS to provide the ability to notify the date, time, and location to registered contact when a ship or light buoy is missing. We can also use a smartphone-based application to map the location of simplified marine peat observation devices. Therefore, it is possible to visit the equipment more quickly when leaving. Generally, large equipment, such as coastal wave buoy and weather buoy is mainly used to measure the crest, but the simple type ocean wave height observation equipment developed by us is small and can be easily installed in desired places. It is the most important factor in oceanographic observation and is proved through experiments that it is possible to measure the accurate wave height with the small type observation equipment developed in this paper. In addition, we can collect location information, wave-height and weather information, and corresponding dates through location based monitoring server.

파랑 관측 자료 기반 제주 서해 파랑자원의 분석

김정석,박지용,최종수,신승호 한국해양환경·에너지학회 2020 한국해양환경·에너지학회지 Vol.23 No.1

In this study, we discussed the characteristics of wave energy resources using long-term ocean wave observation data in the west sea of Jeju. The seasonal variation of the sea state according to the climate of the target sea was confirmed through the characteristics of the ocean wave. The characteristics of ocean wave and the wave energy were analyzed by dividing the periods affected by continental and maritime climate. In winter, due to the influence of the inland climate, the sea state with high wave energy was sustained, and the wave energy during this period was evaluated as having high utilization value as a resource. Through the analysis of ocean wave and wave energy, basic concept for operating the wave energy converters in the target area was established and proposed. This is expected to be used as basic data in planning the utilization of wave resources in the west sea of Jeju. 본 연구에서는 제주 서해의 장기 해양파 관측 자료를 활용하여 파랑에너지 자원의 특성에 관해 논하고자한다. 해양파의 출현 특성을 통해 대상해역 기후에 따른 해상상태의 계절 변동을 확인하였다. 대륙성 및 해양성 기후가 영향을 미치는 기간을 구분하여 해양파의 출현특성과 파랑에너지의 양과 변동 특성을 분석하였다. 겨울철에는 대륙성 기후의 영향으로 인하여 높은 파랑에너지를 갖는 해상상태가 지속되는 특징을 보였고, 이 기간의 파랑에너지는 자원으로서 활용가치가 높은 것으로 평가되었다. 여름철에는 해양성 기후의 영향으로 겨울철과는 상반된 특징을 보였다. 해양파와 파랑에너지에 대한 분석을 통하여 대상해역에서 파력발전장치를 운용하기 위한 기본 개념을 수립하여 제안하였다. 이는 제주 서해의 파랑자원의 활용을 계획함에 있어서 기초자료로 활용될 수 있을 것으로 기대된다.

현장관측을 통한 이안소파잠제의 중력파 및 중력외파 저감효과 검토

정원무(Weon-Mu Jeong),백종대(Jong-Dai Back),최혁진(Hyukjin Choi),김상익(Sang-Ik Kim) 한국해안해양공학회 2018 한국해안해양공학회 논문집 Vol.30 No.2

본 연구는 속초시 영랑동 해안에 설치된 이안소파잠제의 중력파 및 중력외파 저감효과를 검토하기 위하여 잠제 전면(W0)과 후면(W1, W2)에서 현장관측을 수행하여 연속적인 파랑 자료를 분석하였다. 잠제에 의한 파고전달률(Kt)은 단주기파(중력파)와 중력외파로 구분하여 파랑에너지 저감 효과분석을 수행하였으며, 설계 시 적용된 파고저감률과 비교·분석하였다. 잠제 전면(W0)에서 2.0 m 이상의 유의파고가 내습할 경우, 단주기파는 남측 1번 잠제(W1) 배후 파고는 약 65% 저감되고, 2번 잠제 배후(W2) 파고는 약 59% 저감되는 것으로 나타나 잠제가 어느 정도 성능을 유지하고 있는 것으로 평가되었으나, 실해역에 설치된 잠제의 마루수심이 설계와 달라 파고저감 효과는 설계 시 계획에 비해서 다소 떨어지는 것으로 분석되었다. 중력외파는 1번 잠제 배후(W1)와 2번 잠제 배후(W2)에서 파고전달률(Kt)이 2.11과 1.71로 증폭되는 것으로 분석되었으며, 2번 잠제 배후(W2) 파고가 1번 잠제 배후(W1) 파고에 비해서 작은 것으로 나타났다. This study was conducted to observe the effects of gravity and infra-gravity wave of detached submerged breakwater in the coast of Yeongnang-dong, Sokcho, as analyzing continuous wave data by performing field observations on the front area (W0) and rear area (W1, W2). Wave transmission coefficient (Kt) of submerged breakwater was analyzed in two parts, short-period wave (gravity wave) and infra-gravity wave. The wave energy reduction effect was analyzed and compared with the value of the design. In case of above wave height 2.0 m at the front area (W0) of the submerged breakwater, the short-period wave height at point W1 is reduced by about 65% and the short-period wave height at point W2 is reduced by about 59%. The depth of crest of submerged breakwater conducted in a sea area differs from the design, and the wave energy reduction effect is analyzed to be smaller than the design plan. The infra-gravity waves were amplified to 2.11 and 1.71 at the W1 and W2 points, respectively, and the wave height at W2 point was smaller than that at W1 point.

대구지역의 고도와 위치에 따른 하절기 장·단파복사 관측과 해석

최동호,이부용,오호엽 한국태양에너지학회 2012 한국태양에너지학회 논문집 Vol.32 No.4

This study for the understanding of the radiation environment according to the altitude in urban area in the summer observes the long and short wave radiation environment at the 4 urban areas with different height and the 1 suburban area. The results of this study are as follows. (1) When the altitude was high, the more short wave radiation was observed. (2) As the altitude was high, the temperature of atmosphere got lower. And because of that the downward long wave radiation was also lower. This general trend was confirmed through the study. (3) Through the observation of long wave radiation, the upper atmosphere of suburban area had the at mosphere characteristic which the temperature was rising and decreasing faster. Therefore, the difference radiation characteristics between the urban and suburban area were confirmed. (4) The result of the ratio of short wave radiation to long wave radiation(short wave radiation/long wave radiation) according to the altitude and location, the value was increased when the distance was far from the artificiality structure or a heat source, and the urban effect became smaller. Thus, it is expected that the ratio will be an evaluation index for evaluating urbanization effect.

Basic Analysis for Improvement of Mooring Stability Under Long Wave Impact

Ha, Chang-Sik,Moon, Seung-Hyo,Lee, Joong-Woo Korean Institute of Navigation and Port Research 2017 한국항해항만학회지 Vol.41 No.5

This study suggests a general process of analyzing the mooring and cargo handling limit waves, which is an incident to the new energy port under long wave agitation. To reduce damages of ships and harbor structures due to strong wave responses, it is necessary to predict the change of wave field in the mooring berth to make the proper decision by dock master. The berthing area at a new LNG port in the east coast of Korea in this study is frequently affected by oscillations from waves of 8.5~13s periods in the wintertime. The long period waves give difficulties on port operation by lowering the annual berthing ratio. It needs to find the event waves from the real time offshore wave records, which cause over the mooring limits. For that purpose, the wave records from field measurement and offshore wave buoy were analyzed. From numerical simulation, the response characteristics of long period waves in the berthing area were deduced with or without breakwater expansion plan, analyzing the offshore field wave data collected for two years. Some event wave cases caused over the cargo handling and mooring limits as per the standard Korean port design guideline, and those were used for the decision of port operation by dock master, comparing with the real time offshore wave observations.

Basic Analysis for Improvement of Mooring Stability Under Long Wave Impact

Chang-Sik Ha,Seung-Hyo Moon,Joong-Woo Lee 한국항해항만학회 2017 한국항해항만학회지 Vol.41 No.5

This study suggests a general process of analyzing the mooring and cargo handling limit waves, which is an incident to the new energy port under long wave agitation. To reduce damages of ships and harbor structures due to strong wave responses, it is necessary to predict the change of wave field in the mooring berth to make the proper decision by dock master. The berthing area at a new LNG port in the east coast of Korea in this study is frequently affected by oscillations from waves of 8.5~13s periods in the wintertime. The long period waves give difficulties on port operation by lowering the annual berthing ratio. It needs to find the event waves from the real time offshore wave records, which cause over the mooring limits. For that purpose, the wave records from field measurement and offshore wave buoy were analyzed. From numerical simulation, the response characteristics of long period waves in the berthing area were deduced with or without breakwater expansion plan, analyzing the offshore field wave data collected for two years. Some event wave cases caused over the cargo handling and mooring limits as per the standard Korean port design guideline, and those were used for the decision of port operation by dock master, comparing with the real time offshore wave observations.

우리나라 동해안 중부 해역에서 6년간 연속 관측된 파랑의 특성

정원무,오상호,조홍연,백원대 한국해안,해양공학회 2019 한국해안해양공학회 논문집 Vol.31 No.2

This study presents the results of analysis for the wave data that were consecutively collected from February 2013 to November 2018 at the location of 1.6 km offshore from Namhangjin beach. The water depth at the location is 30.5 m and waves were measured by AWAC (Acoustic Wave And Current meter). By using wave-by-wave analysis and spectral analysis, wave heights and periods were evaluated and then the relationships between the quantities obtained by the two methods were proposed based on linear regression analysis. In addition, monthly and yearly variations of the significant wave height and period, and the peak wave direction were analyzed. Moreover, the relationship between the significant wave height and period was newly suggested. Variability and probability distribution of the significant wave period with respect to the significant wave height were also examined. 동해안 남항진 해변에서 1.6 km 떨어진 수심 30.5 m 해역에서 초음파식 파고·파향계를 이용하여 2013년 2 월부터 2018년 11월까지 연속 관측을 실시하여 취득된 파랑자료를 분석하였다. 파별분석법과 스펙트럼법에 의해 파 고와 주기를 분석하고 두 방법에 의해 산정되는 파라메터 사이의 관계식을 선형 회귀분석에 의해 도출하였다. 또한 유의파고, 유의파주기, 첨두파향의 월별 및 연별 변동성을 분석하였다. 이에 더하여 유의파고와 유의파주기의 상관관 계식을 새롭게 제시하고 유의파고에 대한 유의파주기의 변동성 및 확률분포 특성을 고찰하였다.

Seasonal Variations of Mesospheric Gravity Waves Observed with an Airglow All-sky Camera at Mt. Bohyun, Korea (36° N)

김용하,이창섭,정종균,전혜영,김정한 한국우주과학회 2010 Journal of Astronomy and Space Sciences Vol.27 No.3

We have carried out all-sky imaging of OH Meinel, O2 atmospheric and OI 557.7 nm airglow layers in the period from July of 2001 through September of 2005 at Mt. Bohyun, Korea (36.2° N, 128.9° E, Alt = 1,124 m). We analyzed the images observed during a total of 153 clear moonless nights and found 97 events of band-type waves. The characteristics of the observed waves (wavelengths, periods, and phase speeds) are consistent with internal gravity waves. The wave occurrence shows an approximately semi-annual variation, with maxima near solstices and minima near equinoxes, which is consistent with other studies of airglow wave observations, but not with those of mesospheric radar/lidar observations. The observed waves tended to propagate westward during fall and winter, and eastward during spring and summer. Our ray tracing study of the observed waves shows that majority of the observed waves seemed to originate from mesospheric altitudes. The preferential directions and the apparent source altitudes can be explained if the observed waves are secondary waves generated from primary waves that have been selected by the filtering process and break up at the mesospheric altitudes.

Basic Analysis for Improvement of Mooring Stability Under Long Wave Impact

하창식,문승효,이중우 한국항해항만학회 2017 한국항해항만학회지 Vol.41 No.5

This study suggests a general process of analyzing the mooring and cargo handling limit waves, which is an incident to the new energy port under long wave agitation. To reduce damages of ships and harbor structures due to strong wave responses, it is necessary to predict the change of wave field in the mooring berth to make the proper decision by dock master. The berthing area at a new LNG port in the east coast of Korea in this study is frequently affected by oscillations from waves of 8.5∼13s periods in the wintertime. The long period waves give difficulties on port operation by lowering the annual berthing ratio. It needs to find the event waves from the real time offshore wave records, which cause over the mooring limits. For that purpose, the wave records from field measurement and offshore wave buoy were analyzed. From numerical simulation, the response characteristics of long period waves in the berthing area were deduced with or without breakwater expansion plan, analyzing the offshore field wave data collected for two years. Some event wave cases caused over the cargo handling and mooring limits as per the standard Korean port design guideline, and those were used for the decision of port operation by dock master, comparing with the real time offshore wave observations.

도심부와 교외지역의 장 · 단파 복사와 상관도 분석 (Ⅰ)

최동호(Choi, Dong-Ho),이부용(Lee, Bu-Yong) 한국태양에너지학회 2013 한국태양에너지학회 논문집 Vol.33 No.4

The objective of this study was to compare and analyze for seasonal long·short-wave radiation characteristics between downtown area and suburban area in Daegu through field observations. This study was confirmed the regional and seasonal radiation environments and it can utilize as basic data for the analysis of the urban radiation environment and the effects of urbanization. The followings are main results from this study. 1)The downward shortwave radiation showed the similar value of the radiation generally in the downtown area and the suburban area of the city during the winter and summer season. but, long-wave radiation is always higher in downtown area. 2) In case of the long-wave radiation at two stations, we observed 230∼270W /㎡ in the winter season and 415∼470W /㎡ in summer season. As a result, we can see summer season is higher than winter about two times in long - wave radiation. 3)In case of short wave radiation, there is high correlation between two stations in winter season but very low correlation between two stations in summer season because of local atmosphere unstability and etc.