• Title/Summary/Keyword: 바람 영향

Search Result 1,743, Processing Time 0.03 seconds

영구에서의 전력산업 구조개편①

  • 이휘성
    • Electric Engineers Magazine
    • /
    • v.191 no.7
    • /
    • pp.48-52
    • /
    • 1998
  • 세계적으로 전력사업이 정부의 보호와 규제라는 전통적인 특성과 독점적인 운영구조가 급격한 변화를 겪고 있다. 종래 전력, 가스, 수도, 통신 등과 같이 망으로 연결되는 산업은 자연독점이 인정되어 왔으나 통신사업으로부터 시작된 경쟁화의 바람은 전력사업에도 영향을 미쳐 세계각국의 전력사업체제가 변화되고 있다.

  • PDF

국지풍이 소규모만의 해수유동에 미치는 영향

  • 이충일;김동선;조규대
    • Proceedings of the Korean Society of Fisheries Technology Conference
    • /
    • 2001.05a
    • /
    • pp.244-245
    • /
    • 2001
  • 육상 환경과 인접해 있는 연안해양환경은, 그 변화 특성이 매우 독특하며 복잡하게 나타난다. 해양환경 변화에 큰 영향을 미치는 것 중에는 해류와 조류 등과 같은 유체의 운동의 역할이 크다. 특히 바람과 같은 기상환경인자는 해표면의 유체의 운동에 큰 영향을 주게 되며, 이로 인하여 유체내의 입자물질(적조생물, 유류 등)의 집적 및 확산에 결정적인 영향을 끼치게 된다. 우리 나라는 계절풍이 뚜렷하게 나타나는 지역이지만, 지역에 따라서는 주변 지역과의 기압배치 및 지형적인 요인등에 의해서 그 특성이 충분히 변할 수 있다. 이러한 지역적인 국지풍은 만과 같은 소규모 지역에서 큰 영향을 끼칠 것으로 생각된다. (중략)

  • PDF

A Study on Wind Distribution of Mountain Area by Spot Measurements and Simulations (실측 및 해석을 통한 단순 산악지형의 바람장 분포 연구)

  • Kimg, Eung-Sik;Lee, Byung-Doo;Cho, Min-Tae;Kim, Jang-Whan
    • Fire Science and Engineering
    • /
    • v.28 no.6
    • /
    • pp.13-21
    • /
    • 2014
  • Forest fire has a number of variables and since the effects of wind fields are bigger than any other variables, it is essential to know wind direction and velocity for the forest fire extinguishing techniques and the prediction of fire spread. With regards to the local area that has a high chance of forest fire, the data from meteorological observatory in the area is used for the estimation of wind velocity. It is relatively easy to obtain automatic weather station (AWS) data which are available for the whole nation. There is a chance that the data from the weather station may be different with the actual data at the mountain areas. In this study simply shaped hills (Sae-byeol hill of Jeju Island and port Ma-geum in An-myeon Island in the sea side) were selected as the experimental locations to minimize the distortion of the wind field by the adjacent geographic features. Spot measurements and analysis of computational fluid dynamics (CFD) for the given geographic features were conducted to examine and compare their consistency. As a conclusion It is possible to predict wind patterns in these simple locations.

Numerical Modeling of Circulation in Lake Paldang (팔당호의 수치 순환모형)

  • Yoon, Tae Hoon;Kim, Min Kyu
    • KSCE Journal of Civil and Environmental Engineering Research
    • /
    • v.14 no.2
    • /
    • pp.317-324
    • /
    • 1994
  • The circulation of Lake Paldang is analysed numerically as an ultimate goal to develop a vehicle predicting the dispersion and concentration of pollutants and sediment flowed into the lake. In finite difference formulation of 2-D depth averaged governing equations. Abbott's 3-time level scheme is employed and for nonlinear terms time centering iteration technique in time and space is used. Model parameters for shear stresses and eddy diffusivities are determined through measured data in and near the lake. Predicted velocities for steady flow are shown to be close to the measured velocities and further improved by taking into account of wind effect. This indicates that the wind effect is needed for proper circulation analysis and it calls for the inclusion of the wind effect. Simulated results of unsteady flow caused by flood inflows and release through Paldang dam are found to characterize the flow features quite well as expected. This implies that the developed model can be used as a tool to analysing the circulation in the lake.

  • PDF

Effect of Artificial Changes in Geographical Features on Local Wind (인공적 지형변화가 국지풍에 미치는 영향)

  • Kim, Do-Yong;Kim, Jae-Jin
    • Korean Journal of Remote Sensing
    • /
    • v.32 no.2
    • /
    • pp.185-194
    • /
    • 2016
  • The effect of artificial changes in geographical features on local wind was analyzed at the construction site of bridge and fill-up bank in the southern part of Haui-do. Geographic Information System (GIS) data and Computational Fluid Dynamics (CFD) model were used in this study. Three-dimensional numerical topography based on the GIS data for the target area was constructed for the surface boundary input data of the CFD model. The wind observations at an Automatic Weather Station (AWS) located in Haui-do were used to set-up the model inflows. The seasonal simulations were conducted. The differences in surface wind speed between after and before artificial changes in geographical features were analyzed. The surface wind speed decreases 5 to 20% at the south-western part and below 2% of the spatial average for salt field. There was also marked the effect of artificial changes in geographical features on local wind in the westerly wind case for the target area.

Characteristics of Spatio-temporal Variability of Daily averaged Tidal Residuals in Korean Coasts (한국연안 일평균 조위편차의 시공간적 변동 특성)

  • Kim, Ho-Kyun;Kim, Young-Taeg
    • Journal of the Korean Society of Marine Environment & Safety
    • /
    • v.19 no.6
    • /
    • pp.561-569
    • /
    • 2013
  • EOF analysis of tidal residual derived from 2003~2009 tide data was used to identify the spatio-temporal variability. The effect of sea surface air pressures and winds on the tidal residual was also investigated by the correlation analysis. The first mode accounting for 68 % of the total variance represented concurrent sea level rise or fall, and the second mode accounting for 21 % of the total variance explained alternative sea level rise and fall between West Sea coast and both South Sea and East Sea coasts. While northerly and southerly winds dominated the tidal residual in the eastern coast of Yellow Sea, the effect of sea surface air pressures on the tidal residual increased along the coastal regions from South Sea to East Sea.