• Journal of the Korean Geographical Society
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• v.34 no.2
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• pp.123-136
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• 1999

본 연구에서는 제주도의 사면별 강수 분포 특성을 파악하고자 하였다. 기압배치와 상층 풍향별로 4개 기상관측소의 일별 강수량 자료를 분석하였다. 제주도의 강수량은 북서사면 보다 남동사면 쪽이 많다. 그리고 대부분 온대성 저기압과 장마전선, 태풍에 의한 것이며, 앞의 두 경우는 남.동사면, 태풍에 의한 것은 북사면에 많다. 태풍에 의한 호우는 사면간의 강수량 차이가 적고, 저기압에 의한 것은 동서사면간, 장마전선에 의한 것은 남북사면간의 차이가 크다. 풍향별로는 남동과 남서풍계에 의한 강수가 많은데, 겨울에는 북서풍계에 의한 강수도 많다. 기압배치형 보다는 기류의 방향에 따라서 사면간의 강수량 차이가 크며, 남서, 남동풍계가 우세한 여름에는 남사면 강수량이 많고, 북서와 북동풍계가 우세한 겨울에는 북사면이 많다. 사면간의 강수차이는 미우인 경우 더욱 뚜렷하고, 미우는 겨울 북사면에 많다.

• Proceedings of the Korean Environmental Sciences Society Conference
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• 1996.10a
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• pp.26-26
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• 1996

• Proceedings of the Korean Environmental Sciences Society Conference
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• 2006.11a
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• pp.81-82
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• 2006

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2010.04a
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• pp.389-390
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• 2010

• Journal of the Korean earth science society
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• v.33 no.6
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• pp.469-480
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• 2012

This study was to analyze the characteristics of diurnal variation of high $PM_{2.5}$ concentration, $PM_{2.5}/PM_{10}$ concentration ratio by spatio-temporal wind system (wind speed and wind direction) for high $PM_{2.5}$ concentration (over the 24 hr environmental standard of $PM_{2.5}$, $50{\mu}g/m^3$) in the air quality observation sites (Jangrimdong: Industrial area, Jwadong: Residential area) that were measured for 3 years (2005. 12. 1-2008. 11. 30) in Busan. The observation days of high $PM_{2.5}$ concentration were 182 at Jangrimdong and 27 at Jwadong. The seasonal diurnal variation of hourly mean of high $PM_{2.5}$ concentration and of $PM_{2.5}/PM_{10}$ concentration ratio showed a similar pattern that had higher variation at dawn, and night and in the morning than in the afternoon. Durning daytime in summer at Jwadong, the $PM_{2.5}/PM_{10}$ concentration ratio increased because a secondary particulate matter, which was created by photochemical reaction, decreased the coarse particles of $PM_{10}$ more than the fine particles of $PM_{2.5}$ concentrations in ocean condition. We did an analysis of spatio-temporal wind system (wind speed range and wind direction) in each time zone. The result showed that high $PM_{2.5}$ concentration at Jangrimdong occurred due to the congestion of pollutants emissions from the industrial complex in Jangrimdong area and the transportation of pollutants from places nearby Jangrimdong. It also showed that high $PM_{2.5}$ concentration occurred at Jwadong because of a number of local residential and commercial activities that caused the congestion of pollutants.

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2001.11a
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• pp.135-136
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• 2001

최근 들어 서울을 포함한 수도권지역에서의 오존농도가 증가함에 따라 대기환경기준치를 초과하는 횟수가 늘어나고 있는 추세이다. 이에 따라 오존농도를 저감하기 위해 많은 관심을 가지고 있다. 오존농도는 일출이 시작되면서 광화학반응을 통해 생성되는데, 점차 일사강도가 강해지면서 일사량이 강한 오후 2-3시경에 보통 최고 오존농도를 나타낸다. 그러나 최근 들어 일최고 오존농도는 오히려 오후 2-3시보다 그 이후인 4-5시 심지어 오후 6-7시에 일최고 오존농도를 나타내기도 한다. (중략)

• Journal of the Korean Geographical Society
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• v.33 no.2
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• pp.165-177
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• 1998

본 연구에서는 충주호가 그 주변지역의 안개 특성 변화에 미친 영향을 파악하고자 하였다. 충주호 하류에 위치하는 충주와 상류의 제천지역을 사례로 안개일수, 안개 발생.소산시각, 안개 발생 전일의 바람과 일교차 및 기압배치, 상층의 바람 등을 분석하였다. 충주댐 건설 후 두 지역의 안개일수가 크게 증가하였는데, 제천에서는 상대습도와 수증기압이 증가하였으나 충주의 경우는 감소하였다. 또한 충주지역에서는 안개 발생시각이 빨라졌는데, 북서풍계 바람이 불 경우 더욱 뚜렷하며 안개의 빈도도 증가하였다. 안개 소산시각은 충주에서는 빨라졌으나 제천에서는 늦어졌다. 일교차는 충주에서는 감소하였고, 제천지역에서는 증가하였다. 제천의 안개 증가가 충주호에서 공급되는 수증기에 의한 것인데 반하여, 충주의 그것은 방류수의 수온과 기온 차이에 의한 것이다. 이에 따라 충주에서는 동절기에는 증발현상에 의한 안개가, 하절기에는 수면에서의 기온역전에 의한 안개가 크게 늘었다.

• Journal of the Korean earth science society
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• v.24 no.6
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• pp.533-548
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• 2003

The prevailing wind phenomenon around Pohang in winter was investigated by using surface and vertical observatory datas and a numerical simulation was carried out to analyse this phenomenon using RAMS. Direction of the prevailing wind was westerly at upper atmosphere. However, near the surface, southwestern wind prevailed in winter. Using the RAMS to simulate a winter wind system numerically, it was found out that this phenomenon was strongly affected by the geographical features such as directions of coastline and low level valley, and distributions of land and sea. To investigate the accuracy of the model results, wind speed, temperature and wind direction of typical continuous southwestern wind occurring days were compared with observation data. Analyzing the characteristics of local circulation system was very hard because of horizontally sparse observation data. But from the result above, a numerical simulation using the RAMS, which satisfies the spatial high resolution, will provide more accurate results.

• Journal of The Geomorphological Association of Korea
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• v.19 no.2
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• pp.69-79
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• 2012

The aim of this study is to analyze the mid-term changes of beach and dune morphology at Sohwang beach, Korea using by Total Station. Measurements executed 4 times during two year. Based on ArcInfo as point cloud obtained through precise measurement data by Total Station, alteration of beach and dune was analyzed at DEM, of which cell size is about 1m. Since these artificial constructions have influenced current systems of this region, the large-scale sand movements above mentioned have occurred around the jetty and the sea-wall. There occurred sedimentation in the north of the Jetty and erosion in the south of the Jetty, which is installed at the central part of object area. The direction of recent topographic development does not coincide with that of wind, and, rather, topographic changes occurred mainly at beaches and dunes due to the transformation of coastal water flow caused by artificial structure nearby. If precise measurement is conducted periodically, and long term monitoring is carried out by installing equipment measuring movement pattern of sediment around artificial structure, cause of topographic change around the object area could be discovered.

• Journal of the Korean Solar Energy Society
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• v.36 no.1
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• pp.11-18
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• 2016

The local wind systems in the Pohang region were categorized into wind sectors. Still, thorough knowledge of wind resource assessment, wind environment analysis, and atmospheric environmental impact assessment was required since the region has outstanding wind resources, it is located on the path of typhoon, and it has large-scale atmospheric pollution sources. To overcome the resolution limitation of meteorological dataset and problems of categorization criteria of the preceding studies, the high-resolution wind resource map of the Korea Institute of Energy Research was used as time-series meteorological data; the 2-step method of determining the clustering coefficient through hierarchical clustering analysis and subsequently categorizing the wind sectors through non-hierarchical K-means clustering analysis was adopted. The similarity of normalized time-series wind vector was proposed as the Euclidean distance. The meteor-statistical characteristics of the mean vector wind distribution and meteorological variables of each wind sector were compared. The comparison confirmed significant differences among wind sectors according to the terrain elevation, mean wind speed, Weibull shape parameter, etc.