대청호 유입지천의 수질 특성

심무준 ( Moo Joon Shim ),윤재용 ( Jae Yong Yoon ),이수형 ( Soo Hyung Lee ) 한국하천호수학회 2015 생태와 환경 Vol.48 No.1

The tributaries of Daechung Lake play an important role in controlling eutrophication in the lake, which is used for agricultural purposes and as potable water. However, water quality properties were not extensively studied in the tributaries of Daechung Lake. The objectives of this study are to investigate spatial and temporal properties of water quality and to characterize streams which could threaten water quality of Daechung Lake. For this study, water samples were weekly or monthly collected from February 2014 to October 2014 in 9 streams. Water quality parameters analyzed in this study include biochemical oxygen demand (BOD), chemical oxygen demand (COD), total organic carbon (TOC), total nitrogen and phosphorus (TN and TP), suspended solids (SS), and chlorophyll a. Based on temporal distribution and principal component analysis, BOD, COD, TOC, SS, and TP were controlled by not only river discharge that increased during summer due to heavy rain fall, but also due to anthropogenic input (e.g., bridge construction and/or agricultural activity). Dilution is also one of the factors explaining TN and conductivity, both of which decreased with increased discharge. Generally, concentrations of contaminants (BOD, COD, TOC, TN and TP) in the tributaries were higher than those of Daechung Lake. However, pollution load indicated that only the main channel of Geum River and Sook Stream may largely influence lake waters, attributed mostly to their large volumes. This implies that the main channel and Sook Stream are the major influences on the water quality of Daechung Lake.

대청호 유입지천의 수질 특성

심무준,윤재용,이수형 한국하천호수학회 2015 생태와 환경 Vol.48 No.1

The tributaries of Daechung Lake play an important role in controlling eutrophication in the lake, which is used for agricultural purposes and as potable water. However, water quality properties were not extensively studied in the tributaries of Daechung Lake. The objectives of this study are to investigate spatial and temporal properties of water quality and to characterize streams which could threaten water quality of Daechung Lake. For this study, water samples were weekly or monthly collected from February 2014 to October 2014 in 9 streams. Water quality parameters analyzed in this study include biochemical oxygen demand (BOD), chemical oxygen demand (COD), total organic carbon (TOC), total nitrogen and phosphorus (TN and TP), suspended solids (SS), and chlorophyll a. Based on temporal distribution and principal component analysis, BOD, COD, TOC, SS, and TP were controlled by not only river discharge that increased during summer due to heavy rain fall, but also due to anthropogenic input (e.g., bridge construction and/or agricultural activity). Dilution is also one of the factors explaining TN and conductivity, both of which decreased with increased discharge. Generally, concentrations of contaminants (BOD, COD, TOC, TN and TP) in the tributaries were higher than those of Daechung Lake. However, pollution load indicated that only the main channel of Geum River and Sook Stream may largely influence lake waters, attributed mostly to their large volumes. This implies that the main channel and Sook Stream are the major influences on the water quality of Daechung Lake.

대청호 퇴적층의 미생물 분포 밀도

박동진,육연수,박대균,이상화,오희목,김창진,Park, Dong-Jin,Yuk, Youn-Su,Park, Dae-Gyun,Lee, Sang-Hwa,Oh, Hee-Mock,Kim, Chang-Jin 한국미생물학회 1998 미생물학회지 Vol.34 No.4

대청호 퇴적층에 부존하는 미생물들의 분포 양상을 알아보기 위해 대전광역시 동구 추동 대전 취수탑(정체수역) 부근과 충청북도 보은군 회남면 어성리 회남교(본류수역) 부근의 두 지점으로부터 0.5~2 cm와 19~21 cm의 두 깊이에서 장마 전(1998년 5월)과 후(1998년 8월)에 각각 퇴적토를 채집하여 세균, 방선균, 진균의 분포 밀도를 측정하였다. 조사된 모든 미생물군들은 정체수역 보다 본류수역에서 평균 3.9배 더 높게 분포하였으며, 또한 각 수역에서 세균은 장마 전후에 큰 차이가 없었으나 방선균은 장마 후에, 진균은 장마 전에 더 높게 나타났다. 그리고 미생물들의 분포 밀도는 퇴적층의 길이가 깊어짐에 따라 큰 감소를 나타내지 않았으며 오히려 일부 심층에서는 표층보다 더 높게 나타났다. 대청호 인근의 초지 지역과 비교하였을 때, 세균, 방선균, 진균의 분포 밀도는 각각 52.9%, 35%, 7%로 나타났다. 또한 대청호 접경 지점과 비교하였을 때, 세균과 방선균은 각각 1.89배 및 3.63배 더 높았으나 진균은 71.2%의 낮은 분포 수준을 나타내었다. In order to characterize the microbial distribution at sediments of Lake Daechung, soil samples were collected at two depths of 0.5~2 cm and 19~21 cm of Chudong(static) and Hoenam(streaming) site on May 18th(before rainy season) and on August 24th in 1998(after rainy season), and then the density(CFU/g soil) of microorganisms including bacteria, actinomycetes, and fungi was investigated by the viable cell counting method. Microbial density at streaming site was on the whole 3.9-fold higher than that at static site. Bacterial densities examined before and after rainy season was revealed to be similar, whereas actinomycetes and fungi exhibited higher distribution after and before rainy season, respectively. The microbial distribution was not generally reduced with the increase of depth and was rather higher at some deep sites. On comparing with the microbial densities of grass land around the lake, bacteria, actinomycetes, and fungi at lake sediments on the average showed the distribution of 52.9%, 35%, and 7%, respectively. However, their distribution except for fungi which exhibited 71.2% was mostly found to be somewhat higher than at the shore of lake.

대청호 조류거동과 수질인자와의 상관성에 관한 연구

이태관 ( Tae Gwan Lee ) 한국수처리학회 2013 한국수처리학회지 Vol.21 No.3

In general, the growth curve is divided into four stages such as a lag phase, a log phase, a stationary or death phase. The algae needs several different nutrients at each phase. In this study, I tried to analyze a correlation divided on algae growth stages between a algal growth and water quality factors in lake Daechung. On the result of analysis, there was a normal correlation between Chl-a and several factors affiliated with nitrogen on the lag phase. On the log phase, strong correlations began to show between Chl-a, the number of cyanobacteria and water quality factors affiliated with phosphorus element. And the number of cyanobacteria also began to relate high to the number of total algae. During an entire period, there was a significant correlation between Chl-a and COD, so COD had a possibility to be a major nutrient for a algal growth. To control a algal growth for lake Daechung, I recommend to make the basic plan of water quality management included T-N control method for the spring, strong T-P control way for the summer and COD control plan for the entire period.

대청호 홍수조절지 내 경작활동이 수질에 미치는 영향

최혜선(Hyeseon Choi),전민수(Minsu Jeon),김이형(Leehyung Kim) 한국습지학회 2020 한국습지학회지 Vol.22 No.1

경작지의 과다 비료와 퇴비의 사용은 토양내 양분 축적을 증가시키며 잉여 양분은 지표유출 및 지하유출 과정을 통해 수질오염과 녹조발생 등을 유발시킨다. 또한 토양내 과다 양분축적과 함께 지속적 작물 재배는 토양의 산성화를 초래하여 토양의 물리적 구조를 변화시켜 양분의 침출을 더욱 증가시킨다. 대청호 저수구역 내 경작은 대청호의 수질에 직접적 영향을 주기도 하며, 대청댐 수위상승시 침수되어 토양 내 양분이 용출되기도 한다. 본 연구는 대청댐 저수구역 내 경작지의 물리화학적 성상을 분석하여 대청호 수질관리 대책수립에 활용가능한 기초자료를 제공하고자 수행되었다. 대청호 저수구역 경작지 토양은 잉여양분이 이동 가능한 Sandy Loam 토양으로 분류되었다. 작물별 토양내 화학적 성상은 작물별 서로 다른 시비량에 크게 영향을 받는 것으로 나타났다. 그러나 농민의 경작방식과 미기후 변화 등도 경작지 토양의 화학적 성상변화에영향을 주는 것으로 평가되었다. 경작지 토양내 양분양은 지하수 및 인근 하천의 수질 및 대청호 주요 녹조발생에 영향을주는 것으로 나타났다. 논에서의 양분유출은 봄철 강우시 집중되었으며, 밭에서의 양분유출은 여름에서 가을까지의 기저유출 및 멀칭으로 인한 지표유출 등이 영향을 주는 것으로 나타났다. 하천내부의 과다한 식생과 경작지의 유기성 농업잔재물도 하천의 유기물 및 영양염류 증가에 기여하는 것으로 평가되었다. 본 연구결과는 대청호 녹조발생 저감을 위한 저수구역내 경작지 관리를 위한 우선 관리지역 지정 및 관리기법 선정에 활용될 수 있다. The excessive use of fertilizer and compost in agricultural land increases the accumulation of nutrients in soil. The surplus nutrients in soil transported through surface and sub-surface flow can lead to water pollution problems and algal bloom. Moreover, nutrient accumulation and continuous crop cultivation changes the physical structure of the soil, which increases the potential of nutrient. The cultivation in the Daecheong Lake reservoir area may have a direct effect on the lake’s water quality due to leaching and releasing of nutrients when water level rises. This research was carried out to analyze the physical and chemical properties of soil in the agricultural areas surrounding Daecheong Dam reservoir to provide basic data available for the establishment of Daecheong Lake water quality management measures. The soil of the Daecheong Lake reservoir was classified as sandy Loam, where surplus nutrients can be transported. Chemical compositions in the soil were found to be significantly affected by use of different fertilizer amounts. Nutrient outflow occurred during spring rainfall events from the rice paddy fields, whereas excess nutrients from summer to fall seasons originated from dry paddy fields. Nutrient outflow from dry paddy fields is mainly from sub-surface flow. Organic agricultural wastes from agricultural land and excessive vegetation inside the river was also evaluated to contribute to the increase in organic matter and nutrients of the river. The results can be used to select the priority management area designation and management techniques in the Daecheong Lake for water quality improvement.

대청호의 남조류 수화 발달과 환경요인 변화와의 상관 관계

이정준 ( Lee Jeong Jun ),이정호 ( Lee Jeong Ho ),박종근 ( Park Jong Geun ) 한국하천호수학회 2003 생태와 환경 Vol.36 No.3

The study was performed to understand the relationships of cyanobacterial bloom and environmental factors in Lake Daechung. The samples were collected weekly from June to October in 2001. The cyanobacterial bloom was divided into the three phases of the early phase, the middle phase and the late phase by phytoplankton standing crops. For the early phase, the correlation coefficients between chl-α and TP, and chl-α and PO₄-P were 0.986 and 0.894 respectively. Therefore, phosphorus was a main environmental factor in the development of cyanobacterial bloom. Zue/Zm ratio and chl-α showed negative correlation of r=-.995. At the late phase, PO₄-P showed the highest relationship (r-0.958), and TP and temperature showed relatively high relationships (r=0.857 and r-0.813). At the late phase, NH₃-N showed highly positive relationship (r=0.921). It was confirmed that PO₄-P was the most important contribution factor for the bloom through the regression analysis on the environmental factors. As the result, the decrease of Zeu/Zm ratio and the increase of P concentration influenced cyanobacterial bloom developed rapidly in the early phase. Also the cyanobacterial bloom was decreased in proportion to decreasing of NH₃-N concentration in the late phase. It was expected that observation of NH₃-N may be a very useful factor on monitoring of the decreasing situation of the bloom.

상수원보호 관련 주민지원사업의 효과 추정: 옥천군 수변구역을 중심으로

이순배 ( Sun Bae Lee ) 한독경상학회 2008 經商論叢 Vol.26 No.2

과거 대청호의 수질이 자주 악화되자 정부는 상류지역의 경제활동 및 행위 제한으로 대청호의 수질문제를 풀려고 했다. 그럴 때마다 상수원의 이용을 둘러싼 상?하류주민들 간의 이해갈등이 깊어졌다. 이런 상황 속에서 도입된 제도가 주민지원사업이다. 이 지원사업의 핵심은 하류주민이 물이용부담금을 내고, 상류주민들은 그 돈을 보상의 형태로 받고 그리고 보다 더 깨끗한 물을 흘려보내도록 하는 것이다. 그러나 그 보상적 효과가 매우 미약하여 수질보호정책의 근간이 흔들리고 있다. 이것을 진단해보고자 옥천군 수변구역 주민들이 주민지원사업에 대하여 혜택을 받고 있다고 생각하는 화폐적 의사표시금액을 조건부가치측정법(CVM)으로 추정했다. 주민지원사업에 대한 의사표시금액은 1인당 연간 약 10만 2천원으로 추정되었다. 이 추정 금액은 1인당 연평균 지원금액은 55만 7천원보다 훨씬 적게 나타났다. 그 이유는 지원금이 대부분 마을공동으로 사용되기 때문이다. 주민지원사업의 실질효과는 지급되는 지원금에 비해서 개인에게 실제로 돌아가는 (의사표시)금액이 적으면 적을수록 그만큼 더 작아지게 된다. 적은 의사표시금액으로부터 우리는 대청호 상류주민의 적극적 참여에 의한 수질개선효과를 기대하기 어렵다는 결론을 내리게 된다. When the water quality of the Daechung reservoir was getting worse, the Korean government has improved the water quality by the control of business and activation in the Daechung upstream. As a result, it did lead to the conflict of residents between upstream and downstream. In oder to solve this conflict problem, upstream residents support program(URSP) was introduced in 2002. URSP implies that downstream residents pay for water-use charge, and upstream residents take partly it in term of compensation and they should be cooperative to make better the water quality. But it was known that the effect of URSP was very small. In oder to prognose the problem of this water quality policy, we did estimate the subjective appraised value of benefit of riverside Okchun-Gun using Tobit Model. The estimation results of the Tobit Model shows that the value of willingness-to-accept(WTA) are yearly 102,000 Won(A) per resident in the Okchun-Gun riverside. These estimates are far smaller than the average expenditure per resident in the Okchun-Gun riverside(557,000 Won(B)), for which was paid yearly in compensation for the damage in upstream. It proved that the actual expenditure of the Gum river agent was five times of the value of WTA. A ratio of the estimates of WTA to the actual expenditure(A/B) was still smaller than 0.2. It implies that the actual effect of URSP was very small. And it proves that it is difficult to ask uptsream residents for help of the water quality improvement.

추계 대청호 퇴적물 내인의 지화학적 특성

심무준 ( Moo Joon Shim ),양윤모 ( Yun Mo Yang ),오다연 ( Da Yeon Oh ),황윤호 ( Yun Ho Hwang ),이수형 ( Soo Hyung Lee ) 한국하천호수학회(구 한국육수학회) 2015 생태와 환경 Vol.48 No.3

This study was conducted in autumn to determine phosphorus (P) fraction in sediments of Daechung Lake, to elucidate controlling factors for sedimentary P, and to compare with the other areas. For this study, sediment samples were collected at 6 sites only once on November 2014 using ponar grab and analyzed for solid-phase P (Loosely adsorbed, Fe-bound, Al-bound, detrital apatite, and refractory organic P) by sequential extraction. Total phosphorus (TP) was relatively high in front of Daechung Dam and Hoinam where fish farm was run until 1997. The dominant sedimentary P form was Al-bound P, followed by Fe-bound P, which could be released from sediment to water column during suboxic state. Based on principal component analysis, Al-bound P, Fe-bound, and TP were controlled by grain size of sediments. Loosely adsorbed, detrital apatite, and refractory organic P were relatively highly accumulated at the mouth of major tributaries where suspended sediments were delivered. Sedimentary P concentrations in Daechung Lake sediments were not higher than in other lake sediments. Therefore, based on these results, major controlling factors were grain size and input of suspended sediments from tributaries.

추계 대청호 퇴적물 내 인의 지화학적 특성

심무준,양윤모,오다연,황윤호,이수형 한국하천호수학회 2015 생태와 환경 Vol.48 No.3

This study was conducted in autumn to determine phosphorus (P) fraction in sediments of Daechung Lake, to elucidate controlling factors for sedimentary P, and to compare with the other areas. For this study, sediment samples were collected at 6 sites only once on November 2014 using ponar grab and analyzed for solid-phase P (Loosely adsorbed, Fe-bound, Al-bound, detrital apatite, and refractory organic P) by sequential extraction. Total phosphorus (TP) was relatively high in front of Daechung Dam and Hoinam where fish farm was run until 1997. The dominant sedimentary P form was Al-bound P, followed by Fe-bound P, which could be released from sediment to water column during suboxic state. Based on principal component analysis, Al-bound P, Fe-bound, and TP were controlled by grain size of sediments. Loosely adsorbed, detrital apatite, and refractory organic P were relatively highly accumulated at the mouth of major tributaries where suspended sediments were delivered. Sedimentary P concentrations in Daechung Lake sediments were not higher than in other lake sediments. Therefore, based on these results, major controlling factors were grain size and input of suspended sediments from tributaries.

용담댐의 영향분석을 위한 대청호 수질모델링

서동일,이은형 한국수자원학회 2002 한국수자원학회논문집 Vol.35 No.6

용담댐 건설 후 방류 유량 및 방류 수질의 변화에 따라 계산된 금강상류의 모의결과를 이용하여 대청호 수질 변화를 예측하였다. 용담댐의 방류수량, 수질 그리고 대청호의 유량 시나리오는 이 은형 등(2002)이 금강의 모의를 위해 사용한 것과 동일하게 보았으며, 각 경우의 결과를 연구기간중의 실측수질과 실측유량을 사용했을 경우의 결과와 비교하였다. 용담호 방류량의 변화는 대청호 입구 수질에 크게 영향을 미치는 것으로 나타났으나, 대청호댐 부근의 수질에는 영