• Proceedings of the Korea Water Resources Association Conference
• /
• 2019.05a
• /
• pp.277-277
• /
• 2019

하천 유량측정은 대부분의 업무가 야외에서 진행되기 때문에 사고위험에 항상 노출되어 있다. 특히. 교통, 수상안전 사고 등 사회적 안전사고에 대해서는 큰 노력을 기울여 대비하고 있으나, 폭염, 한파 등 자연적 안전사고에 대해서는 아직 대비가 미비하다. 본 연구에서는 겨울철 한파로 인해 발생할 수 있는 안전사고를 예방하고자 한파위험지수(CWRI)를 PSR 구조체계를 통해 제안하였다, 압력, 상태, 반응 지수 산정을 위해 각 요인에 대한 세부지표를 선정하고, 각 지수에 대한 가중치는 엔트로피 방법을 이용하여 한파위험지수를 제안하였다. 그 결과, 전국 14개 광역시도 중 서울특별시가 가장 높고 경상남도가 가장 낮은 한파 위험지수를 보였다. 이러한 결과를 토대로 겨울철 유량측정 시 측정 인원에 대한 안전 계획을 수립하여 안전사고 예방 효과를 높일 것으로 판단된다.

• Journal of the Korean earth science society
• /
• v.26 no.6
• /
• pp.560-572
• /
• 2005

This study investigates the characteristics of atmospheric circulation and the heat source $(Q_1)$ related to the winter cold surge in Korea from 1979 to 1999. The occurrence frequency of cold surge is about one event per year and $60\%$ of the total events occurred during the former period, before 1989. During the cold surge, the pressure pattern shows more dominant east-west dipole circulation pattern in the lower troposphere and the effect of upper level trough is stronger than normal cases. Temperature falling pattern over Korea shows that the pattern opposite to the temperature structure over Lake Baikal and temperature change has opposite signs between the low-middle level and upper level, with the boundary at 400 hPa. The analysis of heat source shows that atmospheric cooling by cold advection during the cold surge is balanced by adiabatic warming due to downward motion, indicating that the movement path of cold core is associated with that of heat sink. Therefore, the movement mechanism of the heat source and sink should be well known for understanding the maintenance mechanism of cold surge and predicting cold surges.

• Journal of the Korean Society of Marine Environment & Safety
• /
• v.27 no.6
• /
• pp.701-707
• /
• 2021

In this study, we examined the sea surface temperature (SST), air temperature (AT), and their time lag in response to an extreme cold wave in 2018 and a weak cold wave in 2019, cross-correlating these to the northern wind direction frequency. The data used in this study include SST observations of seven ocean buoys Real-time Information System for Aquaculture Environment provided by the National Institute of Fisheries Science and automatic weather station AT near them recorded every hour; null data was interpolated. A finite impulse response filter was used to identify the appropriate data period. In the extreme cold wave in 2018, the seven locations indicated low SST caused by moving cold air through the northern wind direction. A warm cold wave in 2019, the locations showed that the AT data was similar to the normal AT data, but the SST data did not change notably. During the extreme cold wave of 2018, data showed a high correlation coefficient of about 0.7 and a time lag of about 14 hours between AT and SST; during the weak cold wave of 2019, the correlation coefficient was 0.44-0.67 and time lag about 20 hours between AT and SST. This research will contribute to rapid response to such climate phenomena while minimizing aquaculture damage.

• 한국지구과학회:학술대회논문집
• /
• 2005.02a
• /
• pp.173-173
• /
• 2005

• The Korean Journal of Quaternary Research
• /
• v.33 no.1_2
• /
• pp.37-48
• /
• 2021

The cold surge is an important extreme weather in East Asia during winter, and is largely affected by behavior of the Siberian high Arctic Oscillation, which represents undulation of large-scale pressure pattern in the Arctic region. Recent studies also revealed that the synoptic low pressure system developing in the eastern boundary of the Asian continent is sensitive to sea surface temperature (SST) and plays an important role in strengthening the cold advection over the Korean Peninsula during cold surges. In this study, we analyzed the Arctic Oscillation affecting the large-scale background of cold surge in East Asia, and the sea surface temperature in the coast of East Asia is examined focusing on its role on synoptic low-inducing cold advection. For the analysis, the days with the bottom 3% of the average daily temperature, measured at five surface stations in Korean Peninsula during 49 years (1969/70-2017/18), were used for the cold surge cases. During the negative phase of the Arctic Oscillation, a strong trough is observed over East Asia, and the inflow of cold air from the polar region is strengthened, which lead to frequent cold surges. In addition, anomalously high SST in the eastern coast of Asia increases sensible and latent heat release from the ocean, therefore, it enlarges the likelihood of synoptic low-inducing extreme cold surges.

• Journal of Wetlands Research
• /
• v.21 no.spc
• /
• pp.123-133
• /
• 2019

This study analyzed the surface temperature mitigation effect of wetlands during cold waves (below -12℃ from January to February) and heat waves (above 33℃ from July to August) in 2018. We used Terra/Aqua Moderate Resolution Imaging Spectroradiometer (MODIS) Daytime and Nighttime Land Surface Temperature (LST) product, and the maximum and minimum air temperature observed at 86 stations of Korea Meteorological Administration (KMA). For the cold wave analysis, the LST of Terra MODIS nighttime was the highest at forest area with -12.7℃, followed by upland crop and wetland areas of -12.9℃ and -13.0℃ respectively. The urban area showed the lowest value of -14.4℃. During the heat wave, the urban area was the highest with + 34.6℃ in Aqua MODIS LST daytime. The wetland area was + 33.0℃ showing - 1.6℃ decrease comparing with urban area.

• Disaster Prevention Review
• /
• v.14 no.1
• /
• pp.67-77
• /
• 2012

• Disaster Prevention Review
• /
• v.17 no.5
• /
• pp.35-40
• /
• 2015

• The Hankook-Saengyark Bo
• /
• no.222
• /
• pp.2-2
• /
• 1998

• 보일러설비
• /
• s.59
• /
• pp.56-61
• /
• 1998