• Title/Summary/Keyword: Uldolmok waterway

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Tide and Tidal Current Characteristics and Tidal Current Power Generation in the Uldolmok Waterway (울돌목 조석-조류 특성 및 조류발전)

  • Kang, Sok-Kuh;Yum, Ki-Dai;Lee, Kwang-Soo;Park, Jin-Soon
    • 한국신재생에너지학회:학술대회논문집
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    • 2006.11a
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    • pp.141-144
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    • 2006
  • The tidal pi lot plant is being built in the Uldolmok waterway using Its strong tidal current with maximum current of about 12knots, which is revealed from the first direct observation using ADCP, on February, 2002. a serious of field observations (for example, ADCP observation was tarried out both at February 2002 and September, 2003), along with numerical modeling, have been carried out over the last several years, in order to understand the tidal dynamics and to examine the related variables according to the tidal current power plant (TCPP) operation.

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Characteristics of Zooplankton Community in the Udolmok Waterway, Korea (울돌목 수로 동물플랑크톤의 군집 특성)

  • Yoo, Jeong-Kyu;Jung, Jung-Ho;Nam, Eun-Jung;Myung, Chul-Soo
    • Korean Journal of Environmental Biology
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    • v.24 no.2 s.62
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    • pp.201-211
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    • 2006
  • 55 zooplankton taxa including 35 copepoda were observed in the Uldolmok waterway during the sampling period from August 2003 to April 2004. Neritic species showed the seasonal species fluctuation, and oceanic warm-water species occurred throughout the year. The number of taxa tended to increase at the flood tide from low tide to high tide, and to decrease at the ebb tide from high tide to low tide. Therefore, species composition of zooplankton in the Uldolmok waterway seemed to be affected by the inflow of oceanic waters with oceanic species all the year round. Total abundance of zooplankton ranged from 104 (February 2004) to 2,717 indiv. $m^{-3}$ (August 2003). According to the tidal cycle, the change of total abundance was more irregular and variable in November 2003 and February 2004 than August 2003 and April 2004. In August 2003 and April 2004, total abundance was low at the strong tide, and was high at low and high tide when tidal current was weak. Average abundances of dominant species such as Paracalanus indicus, Cirripedia nauplii and Acartia hongi were on the order of twice higher at ebb tide than flood tide. However, their abundances were also subject to wide fluctuation within flood tide and ebb tide. The changes of environmental parameters such as water temperature, salinity and chlorophyll-a concentration were negligible along the tidal periods in the Uldolmok waterway. Therefore, the advection, transfer and loss of zooplankton population derived from strong tidal current and eddy formed by the local difference of tidal velocity lead temporal variation of zooplankton community more complex and variable in the Uldolmok waterway.

Nonlinear Tidal Characteristics along the Uldolmok Waterway off the Southwestern Tip of the Korean Peninsula

  • Kang, Sok-Kuh;Yum, Ki-Dai;So, Jae-Kwi;Song, Won-Oh
    • Ocean and Polar Research
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    • v.25 no.1
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    • pp.89-106
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    • 2003
  • Analyses of tidal observations and a numerical model of the $M_2$ and $M_4$ tides in the Uldolmok waterway located at the southwestern tip of the Korean Peninsula are described. This waterway is well known fer its strong tidal flows of up to more than 10 knots at the narrowest part of the channel. Harmonic analysis of the observed water level at five tidal stations reveals dramatic changes in the amplitude and phase of the shallow water constituents at the station near the narrowest part, while survey results show a decreasing trend in local mean sea levels toward the narrow section. It was also observed that the amplitudes of semi-diurnal constituents, $M_2$ and $S_2$ are diminishing toward the narrowest part of the waterway. Two-dimensional numerical modeling shows that the $M_2$ energy flux is dominated by the component coming from the eastern boundary. The $M_2$ energy is inward from both open boundaries and is transported toward the narrow region of the channel, where it is frictionally dissipated or transferred to other constituents due to a strong non-linear advection effect. It is also shown that the $M_4$ generation is strong around the narrow region, and the abrupt decrease in the M4 amplitude in the region is due to a cancellation of the locally generated M4 with the component propagated from open boundaries. The superposition of both propagated and generated M4 contributions also explains the discontinuity of the M4 phase lag in the region. The tide-induced residual sea level change and the regeneration effect of the $M_2$ tide through interaction with $M_4$ are also examined.

Tidal Dynamics and Tidal Current Power Generation in the Uldolmok Waterway

  • Kang, Sok-Kuh;Yum, Ki-Dai;Lee, Kwang-Soo;Park, Jin-Soon
    • Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
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    • 2006.11a
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    • pp.67-73
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    • 2006
  • Uldolmok waterway is famous for its strong tidal current with maximum current of about 12knots, which is located between the Chindo island off the southwestern tip of Korean peninsula and mainland. A serious of field observations, along with numerical modeling, have been carried out over the last several years, in order to understand the tidal dynamics and to examine the related variables according to the tidal current power plant (TCPP) operation.

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Acoustic Characteristics of Underwater Noise from Uldolmok Tidal Current Pilot Power Plant (울돌목 시험조류발전소의 수중소음 특성 연구)

  • Ko, Myungkwon;Choi, Jee Woong;Yi, Jin-Hak;Jeong, Weonmu
    • The Journal of the Acoustical Society of Korea
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    • v.31 no.8
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    • pp.523-531
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    • 2012
  • Recently, as a result of increasing concern about eco-friendly power, the demand for the power stations using environmentally friendly powers such as photovoltaic energy, wind force, tidal power, and tidal current has been increasing worldwide. Among these power stations tidal current power plant requires strong current generated by the topographic characteristics of the ocean floor. Uldolmok waterway producing very strong current is an ideal location for a tidal current power generation. However the occurrence of anthropogenic underwater noise generated by the tidal current power station may affect the marine environment. Therefore, it is necessary to evaluate the noise radiated from the station and predict the range influenced by the radiated noise. In this paper, the measurements of radiated noise spectrum level by the tidal current power station are presented, and the source level per unit area is estimated. Finally, the propagation properties of the radiated noise in the Uldolmok waterway is evaluated from the model simulation using the parabolic equation method, RAM.

Impact assesment of zooplankton by turbine of tidal power plant in Uldolmok waterway, Korea (울돌목 해역에서 조류발전 시설 터빈 가동에 따른 동물플랑크톤의 피해 영향)

  • Yoo Jeong-kyu;Nam Eun-jung;Myung Chul-soo
    • 한국신재생에너지학회:학술대회논문집
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    • 2005.06a
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    • pp.507-511
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    • 2005
  • 울돌목은 조류발전의 세계적인 최적지로 꼽히고 있으며 서해와 남해의 점이 지대로서 조류에 의해 해양 생물 군집의 대량 이동이 빈번한 곳이라 할 수 있다. 조류 발전 시설인 터빈의 가동은 물리적인 충격에 의해 해양 생물의 생태-생리 반응에 영향을 미칠 가능성이 있다. 네트를 이용한 1차 조사에서 터빈 가동에 의한 동물플랑크톤의 순 사망률은 $44.3\%$로 나타났다. 1차 조사 이 후 다이아프램 펌프를 이용한 조사 결과 중 출현 개체수가 높았던 조사에서 전체 동물플랑크톤의 순 사망률은 각각 $7.3\%,\;5.8\%$를 나타내었고, 요각류는 각각 $4.4\%,\;5.2\%$를 나타냈다. 물리적인 충격을 인위적으로 가한 실험에서 스트레스를 받은 요각류 Acartia hongi의 알 생산은 스트레스를 받지 않은 것보다 $1.8\~2.3$배 낮은 경향을 보였다. 본 조사에서 동물플랑크톤이 낮은 사망률을 보골 이유는 작은 크기의 생물이 우점하였기 때문이며 조사 결과에서 몸체가 비교적 단단하고 크기가 작은 요각류는 상대적으로 약한 부유유생보다 높은 생존율을 보였다. 울돌목 조사 해역에서 출현한 동물플랑크톤은 크기가 작아 터빈의 물리적인 충격에 의한 사망률은 낮을 수 있으나 순간적으로 강한 스트레스를 받는다면 재생산을 포함한 생리활동이 저하될 수 있음을 보였다. 네트 및 펌프를 이용한 조사 결과에서 네트에 의한 채집은 터빈의 영향뿐만 아니라 빠른 유속으로 인하여 네트가 받는 압력에 의해 생물체가 손상되는 양상이 높아 사망률이 높았던 것으로 보인다. 그러나 다이아프램 펌프는 생물 채집 시 오류를 최소화하는 장점은 있으나 채집의 장시간에 비해 매우 적은 생물량이 채집되는 단점을 보였다TEX>$96.5\%$에 미달하는 문제는 식물성 원료유로 제조한 고순도 바이오디젤과 혼합 사용하거나 감압 증류 공정을 통해 고농도의 폐식용유 바이오디젤을 제조하여 해결 가능하다. 대전시 신성동 소재의 음식점에서 수거한 폐식용유를 원료로 하여 생산한 바이오디젤의 차량 배출가스 실증 테스트 결과 경유 차량의 주 오염물질인 PM과 Soot 및 기타 오염물질의 배출량은 감소하였으나 NOx의 배출량은 약간 증가하는 것으로 나타났다구와 이해를 바탕으로 보존대책이 마련되어야 한다.되었다. 이런 모든 시편들을 각 탈염방법에 따라 탈염처리한 후 XRD와 SEM-EDS으로 분석한 결과 인철광과 침철광은 어떠한 변화도 보이지 않았고, 다만 적금광으로 동정된 시편만이 잔존하지 않았다. 철기 제작별 $Cl^-$ 이온 추출량과 탈염효과에 대한 비교 실험은 이온 크로마토그래피 분석 결과와 마찬가지로 단조 철제유물이 주조 철제보다 $Cl^-$ 이온을 많이 가지고 있었으며, 탈염 처리 후에는 $Cl^-$ 이온은 전혀 발견되지 않았다. 이상의 결과 $K_2CO_3$와 Sodium 용액은 탈염처리에서 가장 적합한 탈염처리 용액으로 알수가 있었으며 특히 어떠한 탈염 용액으로 유물을 처리한다 해도 철제유물에 생성된 부식물은 제거되지 않는다는 것을 알게 되었다. 따라서 보존처리자는 유물 표면의 부식 상태만을 보고 처리하기 보다는 철기제작물로 고려하여 처리하는 것이 필요하다. 또한 금속에 부식을 야기시키는 $Cl^-$ 이온과 부식물을 완전하게 제거하여 탈염처리를 하는 것이 유물 부식을 최대한 지연시킬 수 있는 것이라 생각된다.TEX>$88\%$)였다.(P=0.063). 결론: 본

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