• The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY
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• v.24 no.2
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• pp.351-373
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• 2019

The cold eddies around the Ulleung Basin in the East Sea were identified from satellite altimeter sea level data using the Winding-Angle method from 1993 to 2015. Among the cold eddies, the Dokdo Cold Eddies (DCEs), which were formed at the first meandering trough of the East Korea Warm Current (EKWC) and were pinched off to the southwest from the eastward flow, were classified and their migration patterns were analyzed. The vertical structures of water temperature, salinity, and flow velocity near the DCE center were also examined using numerical simulation and observation data provided by the Hybrid Coordinate Ocean Model and the National Institute of Fisheries Science, respectively. A total of 112 DCEs were generated for 23 years. Of these, 39 DCEs migrated westward and arrived off the east coast of Korea. The average travel distance was 250.9 km, the average lifespan was 93 days, and the average travel speed was 3.5 cm/s. The other 73 DCEs had moved to the east or had hovered around the generated location until they disappeared. At 50-100 m depth under the DCE, water temperature and salinity (T < $5^{\circ}C$, S < 34.1) were lower than those of ambient water and isotherms made a dome shape. Current faster than 10 cm/s circulates counterclockwise from the surface to 300 m depth at 38 km away from the center of DCE. After the EKWC separates from the coast, it flows eastward and starts to meander near Ulleungdo. The first trough of the meander in the east of Ulleungdo is pushed deep into the southwest and forms a cold eddy (DCE), which is shed from the meander in the south of Ulleungdo. While a DCE moves westward, it circumvents the Ulleung Warm Eddy (UWE) clockwise and follows U shape path toward the east coast of Korea. When the DCE arrives near the coast, the EKWC separates from the coast at the south of DCE and circumvents the DCE. As the DCE near the coast weakens and extinguishes about 30 days later after the arrival, the EKWC flows northward along the coast recovering its original path. The DCE steadily transports heat and salt from the north to the south, which helps to form a cold water region in the southwest of the Ulleung Basin and brings positive vorticity to change the separation latitude and path of the EKWC. Some of the DCEs moving to the west were merged into a coastal cold eddy to form a wide cold water region in the west of Ulleung Basin and to create a elongated anticlockwise circulation, which separated the UWE in the north from the EKWC in the south.

• Korean Journal of Environment and Ecology
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• v.34 no.6
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• pp.515-529
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• 2020

Constructed wetlands undergo biological and physical changes such as an increase in the proportion of arid plants due to the natural succession process after formation. It can adversely affect not only the purification function but also the habitat of species. As such, this study aims to identify environmental factors affecting biodiversity and propose management plans based on the monitoring results of physical environmental changes and the emergence of species in seven constructed wetlands selected based on the water depth and surrounding conditions among the lands purchased by the Nakdong River basin. We examined the environmental conditions and emergence of the Odonata, which is a wetland-dependent species, to predict the trend of changes in biodiversity and abundance. The results showed that the open water area decreased as the emergent plants spread to the deep water in 2015 compared to 2012 when they were initially restored to a depth of 0.2 to 1 m. While a total of 54 dragonfly species were observed, the habitat diversity, such as vegetation, water surface, and grassland, remained similar to the initial formation of the wetlands despite the expansion of the emergent plants. On the other hand, the number of Agrionidae species, which prefer areas with fewer aquatic plants, decreased between 2012 and 2015 due to the diminished water surface. The p-values of the differences in the number of species and population between wetlands by year were 2.568e-09 and 1.162e-08, respectively, indicating the statistically significant differences. The decrease in open water surface was found to have the greatest effect on the biodiversity and habitat density of dragonflies. The time-series survey of constructed wetlands confirmed that the spread of Phragmites communis, P. japonica, Typha orientalis, etc., caused a decrease in species diversity. It suggests that environmental management to maintain the open water surface area is necessary.

• Journal of the Daesoon Academy of Sciences
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• v.27
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• pp.35-77
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• 2016

All humans are subject to death, and this creates a motivation to construct theories regarding divine immorality (神仙思想) in order to satisfy the human desire (慾望) for eternal life (長生) and the avoidance of death(不死). In the concept of Earthly immortality (地上神仙) from Daesoonjinrihoe (大巡眞理會), devotees do not carry out their work in a deep mountain ranges far removed from human society. Instead, they cultivate themselves in Dao from within the human society (自身修道), chant incantation to benefit others, aspire towards immortal status (神仙), and promote harmony between divine beings and humans (神人調和) all without ever leaving human society. In the Yeoju Headquarters of Daesoonjinrihoe, members created a new place called a "Dojang (道場 temple complex)" to live as immortal humans in the here and now while they chant incantations (呪文) as an act of participation in the Immortal Realm of the Later World (後天仙境). Some key religious and fengshui (geomancy) oriented symbols used within the Yeoju Headquarters of Daesoonjinrihoe appear as follows: first, Cheonggye Tower (靑溪塔) represents faith in traditional astrology (星宿神仰) and reverence for the God of the Nine Heavens (九天上帝). Second, Daesoonjinrihoe (大巡眞理會) emphasizes the Saturn associated earth element from five phases (五行土星) and this represent the Later World due to numerological associations. Third, the Fengshui of the Yeoju Headquarters of Daesoonjinrihoe is a highly propitious (吉地) and also accentuates the Saturn associated earth element from five phases. Fourth, Yeongdae (靈臺) in the Yeoju Headquarters of Daesoonjinrihoe faces west where Jeungsan will come accompanied by other gods (神命). Fifth, the Yeoju Headquarters of Daesoonjinrihoe is in charge of property and receives happiness and prosperity (福祿) through its Fengshui. The Yeoju Headquarters of Daesoonjinrihoe is an earthly paradise for immortals (地上天國) forged to achieve the ultimate purpose of transforming its members into the Dotong (道通, those enlightened in Dao and thereby successful in their every endeavor) of the Later World. In accordance with Daesoon thought, the Saturn associated earth element from five phases is positioned in the middle of incantations, and Yeongdae, other architecture, and landscaping has all been arranged to correspond with Daesoon geomancy and numerology (後天數理).