• 한국해양공학회지
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• 제22권4호
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• pp.20-26
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• 2008

The primary purpose of this study was to quantitatively examine whether there was a difference in the settling velocities of cohesive sediments in the Saemankeum artificial lake before and after the closure of the Saemankeum seadike. Through in situ sediment sampling and laboratory experiments, the settling velocities were estimated as a function of the suspension concentration and their physico-chemical properties, such as grain size distribution, the percentage of organic contents, mineralogical composition, etc. were also examined. In this study, their inter-relation with settling velocities were also analyzed qualitatively. The result of the settling tests for Saemankeum sediments showed that there was a big difference in the settling velocities before and after the closure of the Saemankeum seadike. Its settling velocities in a flocculated settling region became remarkably larger after the closure compared to those before the closure, while they were similar but relatively smaller in a hindered settling region. This was found to be mainly due to the difference in their grain size.

• Ocean and Polar Research
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• 제31권1호
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• pp.71-76
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• 2009

Drastic changes in the water quality and phytoplankton community of the new Saemankeum Lakeduring the first decade following the construction of the Saemankeum Sea Wall has been considered to be unavoidable. Input of eutrophicated water through the Mankyeong River and Dongjin River might produce more direct effects on the water quality and phytoplankton community, which lead us to launch a long-term semi-weekly investigation at the "Mankyeong Bridge" monitoring point to resolve its short-term effect as well as long-term stabilization of the ecosystem in the new Saemankeum Lake. During 15 months starting from June 2006, the water temperature varied in accordance with the typical seasonal variations in temperate on the coasts, and no significant daily variations evoked by tidal cycle could be detected. However, there was an inverse relationship between seasonal precipitation and salinity even though the range in annual variation was drastically reduced right after the construction of the Saemankeum Sea Wall. Species richness in the phytoplankton community was also reduced due to the narrowed annual range of salinity, which would eliminate the mid-high salinity species from the Mankyeong Bridge monitoring point. Similarly, species diversity was decreased with increased dominance of the phytoplankton community after the construction. Between the two summer seasons during the present study, species diversity was higher in 2007 than in 2006, which might indicate the early stage of a gradual stabilization in the ecosystem including the phytoplankton community at the monitoring station. The phytoplankton community thus needs to be monitored on a long-term basis to identify indirect signals that can be used to assess the stability of the ecosystem in the young Saemankeum Lake.

• 한국수자원학회논문집
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• 제35권5호
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• pp.475-484
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• 2002

새만금 미세점착성 퇴적물의 침강특성을 퇴적물 자체의 물리ㆍ화학적 기본특성과 연계 해석하기 위하여, 퇴적물의 입경분포, 광물질 구성 및 유기물 함량 조사로 구성되는 새만금 퇴적물에 대한 물리ㆍ화학적 특성 조사가 수행되었다. 새만금 퇴적물의 물리ㆍ화학적 특성에 대한 분석 결과, 새만금 퇴적물은 평균입경(52$\mu\textrm{m}$)이 비교적 크고 유기물 함량(2%)이 매우 작으며, 점착력이 비교적 자은 석영이 주된 광물질 구성성분으로 점착력에 의한 침강효과 보다는 중력에 의한 침강효과가 더 큰 퇴적물인 것으로 밝혀졌다. 따라서 이러한 효과로 인하여, 새만금 퇴적물은 응집효과가 침강속도를 증가시키는 응집침강 영역에서 비교적 작은 침강속도를 가지며, 응집효과가 침강속도를 감소시키는 간섭침강 영역에서는 비교적 큰 침강속도를 갖는 것으로 나타났다.

• 한국수자원학회논문집
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• 제41권5호
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• pp.473-482
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• 2008

본 연구의 목적은 최근 끝막이 공사가 완료된 새만금 인공호 점착성 퇴적물의 침식특성을 정량적으로 분석하는 것이다. 침식실험은 국내 최초로 제작되고 그 타당성이 검증된 전북대 환형수조를 이용하여 각기 다른 밀도를 갖는 균일저면 조건하에서 수행되었으며, 새만금 인공호 점착성 퇴적물의 침식한계전단응력 및 침식률계수가 정량적으로 산정되었다. 한편, 일반적으로 점착성 퇴적물의 침식특성은 퇴적물의 물리.화학적 기본특성에 따라 크게 변화하므로, 새만금 인공호 점착성 퇴적물의 이러한 특성 또한 조사되었으며, 이와 연계하여 침식특성이 해석되었다. 새만금 인공호 점착성 퇴적물의 경우에, 저면밀도 $1.17{\sim}1.34g/cm^3$ 범위에서 침식한계전단응력은 $0.26{\sim}0.52N/m^2$로 로그함수적으로 증가하였으며, 침식률계수는 $14.28{\sim}6.02mg/cm^2\;hr$ 범위로 지수함수적으로 감소하였다. 산정된 침식 매개변수들은 타 지역 점착성 퇴적물과 또한 비교/분석되었으며, 그 값은 정량적으로 지역마다 크게 다른 것으로 나타났다. 특히 새만금 인공호 점착성 퇴적물의 침식한계전단응력은 군산해역 퇴적물보다는 크며, 시화호 퇴적물과는 유사한 것으로 나타났으며, 반면에 새만금 인공호 퇴적물의 침식률계수는 군산해역 퇴적물보다는 작은 것으로 나타났다.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2010년도 춘계학술대회 초록집
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• pp.235.1-235.1
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• 2010

Two ocean current power parks are suggested in the front and back of the Garyuk draining sluices of Saemankeum in Korea. They are characterized by installing a plurality of ocean current turbine generators which are arranged in five rows respectively in the land-side ocean current power park behind the Garyuk draining sluices and in the sea-side ocean current power park before the Garyuk draining sluices, generating electricity using the ocean current flowing through the Garyuk draining sluices in the ebbs and tides of Yellow sea. The potential energy of tidal difference of 2.611m at neap in Saemankeum can be converted into the kinetic energy of high speed ocean current via the Garyuk draining sluices which makes it possible to run the ocean current power parks on a large scale. The total facility capacity of two ocean current power parks that consist of 240 ocean current turbine generators with 4m diameter of turbine blades is about 134MW, and the expected total annual power output is about 586GWh.

• 한국수자원학회논문집
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• 제30권6호
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• pp.649-659
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• 1997

The influence of polluted water discharged from the Saemankeum Lake is predicted by using two-dimensional finite element model. The simulation results show that influence of the Polluted water to the northern part of the Kckunsan Islands is small during flood time. The reason is because lock gates are located in the south of the Kokunsan Islands so that tidal current directing north is blocked by these Islands. However, during the ebb time, the influence of the polluted water is extended to the whole southern part of the Kokunsan Islands. When the amount of ten percent of the total volume of polluted water is discharged from the Saemankeum Lake, equi-concentration contour line of one tenth of initial discharge concentration includes the inner area surrounded by Sinsi Island, Munyeo Island, Bian Island, and Daehang-Li. In general, peak concentration near the lock gates is found out to be higher during the spring tide than the neap tide.

• 신재생에너지
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• 제7권2호
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• pp.51-58
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• 2011

Saemankeum is well known for its high speed wind, and it is known that the blueprint of a future city around Saemankeum, including new industrial complex, has been planned. As a result, large-scale offshore wind farm, on the basis of the measurement of wind resource for a long time, can be considered, so that generated electricity can be used to meet the energy demand near the wind farm. Wind speed in Kokunsando of Saemankeum is measured and analyzed with its statistical distribution and wind directions. The probability of wind power resource over Kokunsando of Saemangeum is reviewed with the measured data in one island of Kokunsando. According to measured data, the shape and scale factor of Weibull distribution of wind speed are obtained, and then power density is analyzed as well. Through this study, it is clear that the Saemangeum area has a fluent and abundant wind power source to develop the wind farm in Korea.

• 한국수산과학회지
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• 제35권4호
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• pp.348-355
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• 2002

To know characteristics of water quality in Saemankeum area, we were investigated the water quality of surface layer from July of 1999 to June of 2000. The concentrations of COD and chlorophyll a were in the range of $0.64\~6.40$ (mean 1.96)mg/L, $1.95\~51.55$ (mean 11,07)$mg/m^3$, respectively. The annual mean concentrations of DIN, DIP were found to be 21.182 $\mu$g-at/L and 0,655 $\mu$g-at/L respectively, which were exceeding second grade of seawater quality standard. The nitrogen ratio to the phosphorus was lower than 1. Therefore, nitrogen was playing an important role in phytoplankton growth as limiting factor in study area. Mean values of eutrophication index were exceeding 1, which was the eutrophication criteria. Especially Mankyung and Dongjin estuary were shown over 10 as eutrophication index. Therefore, Saemankeum area could be evaluated to possibility area for eutrophication. Released rate for ammonia nitrogen and phosphate phosphorus from sediments were 62.92 ${\mu}g-at/m^3/hr$ and 6.71 ${\mu}g-at/m^3/hr$, respectively.

• 한국농공학회:학술대회논문집
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• 한국농공학회 2002년도 학술발표회 발표논문집
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• pp.441-444
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• 2002

In recent, industrialization increases the level of pollution load in sea areas, and the inflows of pollutants to public sea areas cause sudden and wide-range of influence to the water quality and the ecosystem. To prepare for these kinds of unpredictable water pollution issues, the necessity is emerging to build an automatic water quality monitoring system, which can monitor and alarm the water quality changes of the subject sea areas. For the ongoing installation plan of the automatic water quality monitoring system around the Saemankeum sea area, this report compares and analyzes its installation conditions as well as the physical and chemical characteristics of the in-situ type and the water-sampling type of the automatic water quality monitoring equipments, and subjects to provide elementary data for the system installation in the Saemankeum.

• 한국수산과학회지
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• 제36권1호
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• pp.49-54
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• 2003

새만금 갯벌의 입조조성 및 유기물질 분포 특성을 조사하기 위해 1999년 갯벌 91개를 채취하여 분석한 결과를 요약하면 다음과 같다. 입도의 특성을 보면 새만금 갯벌은 사질이 우세하였고, 세립한 제이차 혼합물인 실트질이 추가된 반면 Clay 함량은 매우 낮게 나타났다. 평균값의 범위는 $4.60\~10.90\;{\phi}$이었고 분급도 범위는 $-0.1\~1.75\;{\phi}$이었다. 그리고 왜도의 범위는 $-1.0\~0.92\;{\phi}$이었으며 첨도의 범위는 $0.27\~6.75\;{\phi}$를 보였다. 그러므로 새만금 방조제 공사에 의해 갯벌은 심한 변화 양상을 보이는 것을 알 수 있었다. 유기물질과 관련된 항목을 살펴보면, ORP의 범위는 -133$\~$200 mV로 평균 73 mV의 산화 상태를 나타내었지만 전체 91개 지점 중 24개 지점에서 환원상태를 나타내고 있었다 CODs의 농도범위는 $17.54\~6,176.25\;mg/kg$을 보였고 총탄소와 총황의 비 (S/C)는 0.02$\~$0.45 (평균0.24) 범위를 보였다. 그러므로 새만금 갯벌은 아직까지는 육상에서 유입되는 인위적인 유기 오염물의 영향을 비교적 적게 받는 것으로 사료되었다. 이상의 결과를 보면 새만금 갯벌은 사질이며 육상에서 유입되는 유기물 오염이 낮아 수산생물 생육 장소로 적합하므로 계속 보존하는 것이 좋을 것으로 생각되며 앞으로도 지속적인 조사연구가 이루어져야 한다.