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NTrend 1.0에 의한 낙동강 수질 장기변동 추세분석
유재정 ( Jae Jeong Yu ),신석호 ( Suk Ho Shin ),윤영삼 ( Young Sam Yoon ),송재기 ( Jae Kee Song ) 한국물환경학회 2010 한국물환경학회지 Vol.26 No.6
The effect of seasonality on water quality variation is very significant. Generally, it reduce the power of the trend extraction. A parametric time-series model was used for detecting trends in historic constituent concentration data. The effect of seasonality is able to remove from time series decomposition technique. According to such statistic methode, long-term water quality trend analysis system (NTrend 1.0) was developed by Nakdong River Water Environmental Research Center. The trend analysis of BOD variation was conducted with NTrend 1.0 at Goreong and Moolkum site in Nakdong river to show the effect of water quality management action plan. Power test of trend extraction was tried each case of `deseasonalized and deannulized` data and `deseasonalized` data. Analysis period was from 1989 to 2006, and it`s period was divided again three times, 1989~1993, 1994~1999 and 2000~2006 according to action plan period. The BOD trend was downward in Goreong site during three times and it`s trend slope was very steep, and upward in Moolkum during 1989~1993, but it was turned downward during 1994~1999 and 2000~2006. It was revealed that it`s very effective to reduce the concentration of BOD by water quality management action plan in that watershed. The result of power test was shown that it is high for trend extraction power in case of `deseasonalized` data.
유재정 ( Jae Jeong Yu ),이경락 ( Keung Lak Lee ),이혜진 ( Hye Jin Lee ),황정화 ( Jeong Wha Hwang ),류희성 ( Heuy Seong Lyu ),신라영 ( La Young Shin ),박아름 ( A Reum Park ),천세억 ( Se Uk Chen ) 한국물환경학회 2015 한국물환경학회지 Vol.31 No.2
The construction of the eight large weirs in the Nakdong River, the second largest river in Korea, caused big changes in the physical environment of the water system. Algal communities and their correlations with environmental factors, mainly nutrients were studied at five weir areas in the Nakdong River from 2010 to 2013. Water quality, hydrodynamics and algal composition were investigated. Results showed that flow velocities were reduced compared with that before weir construction near the areas where are located in the mid and upstreams of the Nakdong River. A seasonal algal community succession was observed and it was mainly correlated with temperature and phosphorus. Diatoms were dominated from winter to spring months and massive diatomic blooms of Stephanodiscus sp. occurred early in March during survey period. Cyanobacterial blooms of Microcystis sp. occurred from July to September 2013 and was preceded by the lower total phosphorus concentration of 0.05 mg L-1. The correlations between total phosphorus concentrations and algal abundances were not significant during the survey periods. However, significant correlation with cyanobacteria was found in the period of weir construction after only at the GG survey site and blooms periods of 7 times in the survey sites, and its correlation coefficients were 0.53 (p<0.001) and 0.42 (p<0.01) respectively. When algal bloom was observed, partially low nutrient concentration was observed in the Nakdong River. In conclusion, partially low nutrient concentration which may result from algal bloom was observed, and we presume it caused the reduction of algal abundunces.
낙동강의 식물플랑크톤 우점종의 분포특성 및 수온과의 상관성
유재정 ( Jae Jeong Yu ),이혜진 ( Hye Jin Lee ),이경락 ( Kyung Lak Lee ),류희성 ( Heuy Seong Lyu ),황정화 ( Jeong Wha Whang ),신라영 ( La Young Shin ),천세억 ( Se Uk Chen ) 한국하천호수학회 2014 생태와 환경 Vol.47 No.4
The construction of eight large weirs in the Nakdong River, Korea, caused a decrease in the water flow velocity and several physical changes to the water environment. Here, changes in phyto- and zooplankton communities and water quality in the areas near the eight weirs were investigated from 2011 to 2013, and relationships between phytoplankton abundances and environmental factors were analyzed. Special emphasis was given to the succession patterns in algal abundance based on temperature fluctuations. At the eight weirs, 24 dominant species were found. The most abundant phytoplankton species was Stephanodiscus sp. (39.4% of dominant frequency). Cyanobacteria of the genus Microcystis dominated during the summer, with an dominant frequency of 8.5% and cell abundance ratio of 36.6%. Significant correlations were observed between temperature and abundance of eight of the main dominant species; seven species showed positive correlations with temperature. Stephanodiscus sp., however, showed a negative correlation with temperature (r=-0.26, p.0.01). In addition, this species showed a significant negative correlation with the dominant algal species-Aulacoseira granulata and Aphanizomenon flos-aquae, with the zooplankton Copepoda and with Cladocera. On the contrary, seven other dominant species of algae showed significant positive correlations with zooplankton. Thus, we showed that the seasonal succession of plankton communities in the Nakdong River was related to the water temperature changes.
연구논문 : 남강중권역 오염부하 전망 및 삭감 시나리오별 하류 수질예측
유재정 ( Jae Jeong Yu ),신석호 ( Suk Ho Shin ),윤영삼 ( Young Sam Yoon ),강두기 ( Doo Kee Kang ) 한국환경영향평가학회 2012 환경영향평가 Vol.21 No.4
Namgang mid-watershed is located in downstream of Nakdong river basin, There are many pollution sources arround this area and it`s control is important to manage a water quality of Nakdong river, A target year of Namgang mid-watershed water environment management plan is 2013, To predict a water quality at downstream of Namgang, we have investigated and forecasted the pollutant source and it`s loading, There are some plan to construction the sewage treatment plants to improve the water quality of Nam river. Those are considered on predicting water quality. As results, it is shown that the population is 343,326 and sewerage supply rate is 79.2% and the livestock is 1,662,000 in Namgang mid-watershed, It is estimated that the population is 333,980, the sewerage supply rate is 86.9% in 2013, The milk cow and cattle were estimated upward and the pigs were downward by 2013. The generated loading of BOD and TP is 75,957 kg/day and 4,311 kg/day, discharged loading is 18,481 kg/day and 988 kg/day respectively in 2006, It were predicted upward the discharged loading of BOD and TP by 4.08% and 6.3% respectively. The results of water quality prediction of Namgang4 site were 2.5 mg/L of BOD and 0.120 mg/L of TP in 2013. It is over the target water quality at that site in 2015 about 25.0% and 9.1% respectively. Consequently, there need another counterplan to reduce the pollutants in that mid-watershed.
밀양강 중권역 오염부하 전망 및 삭감 시나리오별 하류 수질예측
유재정 ( Jae Jeong Yu ),윤영삼 ( Young Sam Yoon ),신석호 ( Suk Ho Shin ),권헌각 ( Hun Gak Kwon ),윤종수 ( Jong Su Yoon ),전영인 ( Young In Jeon ),강두기 ( Doo Kee Kang ),갈병석 ( Byung Seok Kal ) 한국환경과학회 2011 한국환경과학회지 Vol.20 No.5
Milyanggang mid-watershed is located in downstream of Nakdong river basin. The pollutants from that watershed have an direct effect on Nakdong river water quality and it`s control is important to manage a water quality of Nakdong river. A target year of Milyanggang mid-watershed water environment management plan is 2013. To predict a water quality at downstream of Milyang river, we have investigated and forecasted the pollutant source and it`s loading. There are some plan to construction the sewage treatment plants to improve the water quality of Milyang river. Those are considered on predicting water quality. As results, it is shown that the population of Milyanggang mid-watershed is 131,857 and sewerage supply rate is 62.2% and the livestock is 1,775.300 in 2006. It is estimated that the population is 123,921, the sewerage supply rate is 75.5% in 2013. The generated loading of BOD and TP is 40,735 kg/day and 2,872 kg/day in 2006 and discharged loading is 11,818 kg/day and 722 kg/day in 2006 respectively. Discharged loadings were forecasted upward 1.0% of BOD and downward 2.7% of TP by 2013. The results of water quality prediction of Milyanggang 3 site were 1.6 mg/L of BOD and 0.120 mg/L of TP in 2013. It is over the target water quality at that site in 2015 about 6.7% and 20.0% respectively. Consequently, there need another counterplan to reduce the pollutants in that mid-watershed by 2015.
유재정 ( Jae Jeong Yu ),전성환 ( Seong Hwan Jeon ),박정민 ( Jeong Min Park ),정제호 ( Jae Ho Jeong ),박상정 ( Sang Jeong Park ),민경석 ( Kyung Sok Min ) 한국물환경학회 2002 한국물환경학회지 Vol.18 No.3
Reactive dyes waste water, a toxic and refractory pollutant, was treated by an electrochemical method using Ti/IrO_2 as anode and Stainless Steel 316 as cathode. In this technique, sodium chloride as an electrolyte was added. A number of experiments were run in a batch system. Artificial samples (reactive blue 19, red 195, yellow 145) were used. Operation parameters, such as supporting electrolyte concentration, current density, pH and sample concentration have been investigated for their influences on COD and color removal efficiencies during electrolysis, After 5 and 90 minites of eletrolysis, color was reduced by 51.5% and 98.9% respectively, under the condition of current density 10A/d㎡, NaCl concentration 12mg/l and pH 3, 62.9% of COD_Cr was removed after electrolysis for 90 minites. The optimum condition of color removal and COD reduction in this work was found to be the following : pH 3, sodium chloride concentration 20g/l, current density 10 A/d㎡. As a result, we confirmed to be effective to color removal and reduction of refractory organic material.