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박재충,박정원,김종달,신재기,Park, Jae-Chung,Park, Jung-Won,Kim, Jong-Dal,Shin, Jae-Ki 한국조류학회(藻類) 2005 ALGAE Vol.20 No.4
Spatial and temporal variations of environmental factors and phytoplankton community were investigated in the three stations of Andong Reservoir in 1997 and 2003. The changes of physico-chemical water quality and phytoplanktonic biomass were higher in 2003 than that of 1997, due to rainfall difference. The concentration of total nitrogen (TN) and total phosphorus (TP) in the reservoir decreased, but total nitrogen fell relatively more between them. TN/TP ratio decreased from 109 to 90 showing no change at the downstream but a big decrease at the midand upstream. Predominant phylum of phytoplankton in Andong Reservoir were six genus that composed to Anabaena, Aphanizomenon and Microcystis of Cyanophyceae, Cosmarium and Scenedesmus of Chlorophyceae and Synedra of Bacillariophyceae, respectively. Among the observed phytoplankton, diatom Synedra occured as the maximum amount of 3,400 cells mL$^{-1}$ even at the above 30°C. Green algae Scenedesmus observed along with Microcystis. It seemed to be compete with Microcystis during the high water temperature period. Although trophic state of Andong Reservoir was decreased, the standing crops of phytoplankton were increased. Moreover bluegreen algae, Aphanizomenon and Microcystis in the region of upstream to midstream and diatom, Synedra in the region of midstream to downstream were increased until to reach the algal bloom, respectively. It seemed necessary to attention the changes of blue-green algae Aphanizomenon, that has an ability of nitrogen fixation.
연구논문 : 댐 방류형태가 하류 하천 수온변화에 미치는 영향 예측
박재충 ( Jae Chung Park ),윤진혁 ( Jin Hyuk Yoon ),정용문 ( Yong Moon Jung ),손지연 ( Ji Yeon Son ),송영일 ( Young Il Song ) 한국환경영향평가학회 2012 환경영향평가 Vol.21 No.5
In this study, we simulated water temperature in the downstream according to withdrawal types of dam using EFDC model. Three scenarios were assumed as water was released from the surface layer, the middle layer, and the bottom layer at intervals of 10m depth. In case of the surface layer withdrawal, the water temperature rose from March and lowered gradually after it reached a peak in August. The middle and the bottom layers effluence temperatures were lower than the surface layer temperature by maximum 15.9℃(in July), but after September, temperature inversion appeared. It was advantageous for the surface layer withdrawal to decrease cold damage and fog in downstream area and was possible to the middle and the bottom layers withdrawal from August to September. However, the reliability of model should be improved by accumulating the real-time information of water temperature.
연구논문 : HSPF, EFDC 및 WASP에 의한 영주다목적댐 저수지의 수질예측
박재충 ( Jae Chung Park ),최재훈 ( Jae Hun Choi ),송영일 ( Young Il Song ),송상진 ( Sang Jin Song ),서동일 ( Dong Il Seo ) 한국환경영향평가학회 2010 환경영향평가 Vol.19 No.5
This study was carried out to investigate the effect of EFDC hydrodynamic result on the WASP7.3 water quality modeling result in accordance with the change of number of grid for the dam reservoir to be constructed. The simulated flow and BOD, T-N and T-P loads by the HSPF watershed model was used for boundary conditions and the hydrodynamic modeling results was linked with WASP model to predict future water quality after dam construction. The scenarios for EFDC modeling were composed of Scenario 1(141 grid cells) and Scenario 2(568 grid cells). The results of Scenario 2 showed that BOD, T-N, T-P and Chl-a concentrations were decreased 0.073mg/L(8.5%), 0.032mg/L(2.6%), 0.003mg/L(6.8%), 0.644μg/L(4.2%) compared with those of Scenario 1, respectively. As number of grid cell increased, water quality concentrations were decreased and also it caused the longer running time. Therefore, this study suggests that the consideration of the geometry of water body is more important than the number of grid cells for the prediction of water quality of a dam reservoir in EIA.
CuSO4에 의한 geosmin 유발조류(Anabaena macrospora)의 제거
박재충 ( Jae Chung Park ),박재범 ( Jae Bum Park ),송성일 ( Sung Il Song ),김현숙 ( Hyun Suk Kim ),박정원 ( Jung Won Park ) 한국물환경학회 ( 구 한국수질보전학회 ) 2006 한국물환경학회지 Vol.22 No.3
We have studied the possibility of removing Anabaena macrospora by injecting copper sulfate (CuSO4 · 5H2O) into the raw water of a drinking water purification plant. Anabaena macrospora caused the unpleasant geosmin odor of drinking water in August 2001. The cell break-point of A. macrospora was 0.3 ㎎/L of CuSO4. We were able to reduce the standing crops of A. macrospora effectively because CuSO4 could break A. macrospora selectively. Because 0.3 ㎎/L of CuSO4 could break both cells and akinetes, it reduced the possibility of a recurrent problem for them to meet a favorable condition. When CuSO4 was injected in the early growth phase of algae and the mixing intensity was high, A. macrospora could be removed most effectively. The odor caused by A. macrospora was sustained for a while without any sudden change of environmental condition. Therefore, we hope that it could shorten the period of obstacle by injecting the optimal amount of 0.3 ㎎/L of CuSO4. The water quality, alkalinity, conductivity, hardness and pH didn`t changed by the injection of CuSO4.
국내 6개 다목적댐 저수지의 담수 전,후 수질 비교평가
박재충 ( Jae Chung Park ),신재기 ( Jae Ki Shin ),송영일 ( Young Il Song ),정용문 ( Yong Moon Jeong ),송상진 ( Sang Jin Song ) 한국환경영향평가학회 2011 환경영향평가 Vol.20 No.1
This study was carried out to assess the variations of water quality caused by the dam construction on the river. Six dams-Yongdam, Miryang, Hoengseong, Boryeong, Jangheung and Buan-constructed recently in Korea were selected for the study. Chemical oxygen demand(COD) was increased in the initial stage of water storage at dams compared to the lotic(river) environment, but after 3 years it was maintained lower and stabilized concentrations. Five dams except for Jangheung Dam were maintained Ia~Ib grade conditions under the water quality criteria of Korea. The concentrations of total nitrogen(T-N) were decreased under the lentic(reservoir) environment compared to the river status. Total phosphorus(T-P) was decreased 13~63% at the reservoir condition. We concluded that increase of COD concentration was due to the debris organic materials of the land, but temporary phenomenon. T-N and T-P concentrations were decreased at the lentic condition compared to the lotic.