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지상 고밀도 관측 시스템을 이용한 대구의 여름철 고온현상 조사
김상헌 ( Sang Heon Kim ),조창범 ( Chang Bum Cho ),김해동 ( Hae Dong Kim ) 한국환경과학회 2014 한국환경과학회지 Vol.23 No.9
We analyzed diurnal variations in the surface air temperature using the high density urban climate observation network in Daegu metropolitan city, the representative basin-type city in Korea, in summer, 2013. We used a total of 28 air temperature observation points data(16 thermometers and 12 AWSs). From the distribution of monthly average air temperature, air temperature at the center of Daegu was higher than the suburbs. Also, the days of daily minimum air temperature more than or equal to 25℃ and daily maximum air temperature more than or equal to 35℃ at the schools near the center of Daegu was more than those at other schools. This tendency appeared more clearly on the days of daily minimum air temperature more than or equal to 25℃. Also, the air temperature near the center of the city was higher than that of the suburbs in the early morning. Thus it was indicated that the air temperature was hard to decrease as the bottom of the basin. From these results, the influence of urbanization to the formation of the daily minimum temperature in Daegu was indicated.
김해동 ( Hae Dong Kim ),조창범 ( Chang Bum Cho ),서광수 ( Kwang Su Seo ) 한국환경과학회 2016 한국환경과학회지 Vol.25 No.1
We analyzed the characteristics of fog formation in the Gumi Reservoir of Nakdong river with the field observation data for recent 2 years (1 April 2013~31 March 2015) collected by the national institute of meteorological research, KMA. In early morning, we frequently observe the steam rising from the water surface. The fog occurs from adding water vapor into the air. We call the fog as steam fog. Steam fogs occur when cold, dry air mixes with warm, moist air above a water surface. The steam fog appears mainly in autumn under the following conditions; (1) sensible heat is positive values (10~20 W/m^{2}), (2) latent heat is more positive values (25~35 W/m^{2}) than sensible heat, (3) cloudless nights with light winds (about 1.5 m/s), (4) under condition(3), mountainous winds easily blows into the reservoir.
낙동강 강정고령보의 여름철 열수지 일변화 -열 저장량 변동을 중심으로-
김성락 ( Seong Rak Kim ),조창범 ( Chang Bum Cho ),김해동 ( Hae Dong Kim ) 한국환경과학회 2015 한국환경과학회지 Vol.24 No.6
Surface heat balance of the Gangjeong-Goryung Reservoir is analyzed for 12-17 August 2013. Each flux elements at the water surface is derived from the special field observations with application of an aerodynamical bulk method for the turbulent heat fluxes and empirical formulae for the radiation heat fluxes. The rate of heat storage in the reservoir is estimated by using estimated by surface heating rate and the vertical water temperature data. The flux divergence of heat transport is estimated as a residual. The features of the surface heat balance are almost decided by the latent heat flux and the solar radiation flux. On average for 12-17 August 2014 in the Gangjeong- Goryung Reservoir, if one defines the insolation at the water surface as 100 %, 94 % is absorbed in the reservoir; thereafter the reservoir loses about 30~50% by sensible heat, latent heat and net long-wave radiation. The residue of 50~80 % raises the water temperature in the reservoir or transported away by the river flow during the daytime.
낙동강 유역 안개 발생시 기상 특성: 강정고령보 사례를 중심으로
박준상 ( Jun Sang Park ),임윤규 ( Yun Kyu Lim ),김규랑 ( Kyu Rang Kim ),조창범 ( Chang Bum Cho ),장준영 ( Jun Yeong Jang ),강미선 ( Misun Kang ),김백조 ( Baek Jo Kim ) 한국환경과학회 2015 한국환경과학회지 Vol.24 No.5
Visibility and Automatic Weather System(AWS) data near Nakdong river were analyzed to characterize fog formation during 2012-2013. The temperature was lower than its nearby city ? Daegu, whereas the humidity was higher than the city. 157 fog events were observed in total during the 2 year period. About 65% of the events occurred in fall (September, October, and November) followed by winter, summer, and spring. 94 early morning fog events of longer than 30 minutes occurred when south westerly wind speed was lower than 2 m/s. During these events, the water temperature was highest followed by soil surface and air temperatures due to the advection of cold and humid air from nearby hill. The observed fog events were categorized using a fog-type classification algorithm, which used surface cooling, wind speed threshold, rate of change of air temperature and dew point temperature. As a result, frontal fog observed 6 times, radiation 4, advection 13, and evaporation 66. The evaporation fog in the study area lasted longer than other reports. It is due to the interactions of cold air drainage flow and warm surface in addition to the evaporation from the water surface. In particular, more than 60% of the evaporation fog events were accompanied with cold air flows over the wet and warm surface. Therefore, it is needed for the identification of the inland fog mechanism to evaluate the impacts of nearby topography and land cover as well as water body.
연구논문 : 국지 기상 요소에 의한 태양광 발전량 변동특성에 관한 연구
이순환 ( Soon Hwan Lee ),김해동 ( Hae Dong Kim ),조창범 ( Chang Bum Cho ) 한국환경과학회 2014 한국환경과학회지 Vol.23 No.11
In order to clarify the characteristics of Photo-Volatic(PV) power generation over the Korean peninsula with complex terrain, special meteorological observation campaign was carried out for one year from 25 May 2011. Analysis is based on the comparison between observed meteorological elements and PV values generated at rated capacity 200 kW power plants. Solar radiation observed at 15° inclined surface is 11 % larger than that observed at horizontal surface due to low elevation angel of the sun during winter season. The PV power generation tend to be more similar the variation of inclined surface irradiance than horizontal surface irradiance. Increasing air temperature often induce disturbance of the PV power generation. However, the higher the air temperature in winter season, the higher PV power generation because the PV module may be more activated at higher air temperature. PV generating efficiency tends to be conversed the value of 15%.
김학윤 ( Hak-yun Kim ),서광수 ( Kwang-su Seo ),조창범 ( Chang-bum Cho ),김해동 ( Hae-dong Kim ) 한국환경과학회 2016 한국환경과학회지 Vol.25 No.8
The heat budget is investigated in the Gumi Reservoir of the Nakdong river. In warm climate season, solar radiation effects play a important role in the change of water temperature. The features of the surface heat balance are almost derived by the latent heat flux and the solar radiation flux. On the other hand, in cold climate season, change of heat stored in the water is mainly dominated by latent and sensible heat transfer between water and air, since flux of solar radiation and loss of outgoing long wave radiation balance approximately. For the annual averages, net flux of radiation, evaporation(latent heat) loss are dominant in the Gumi reservoir. The evaporation losses are dominant from spring to early winter. This means that the Gumi reservoir rolls like a lake of thermal medium or deep depth.