• 한국환경과학회지
• /
• 제16권3호
• /
• pp.357-367
• /
• 2007

Recently, eutrophication or lake and reservoir has become serious problem to man who want use that water for several purpose. In order to solve the eutrophication problem, the trophic state of that eutrophic lake and reservoir should be measured properly. For the purpose of this, various method to indicate the trophic state of lake and reservoir was developed by many researchers. This research was conducted to evaluate characteristics and eutrophication of water qualitymfor small scale reservoir in Kunsan. On-site investigation to 5 reservoirs and laboratory experiment were carried out during four seasons from November, 2003 to July, 2004. Twelve items measured field ana a laboratory. Measured data was analyzed to quantitative method by multivariate approach and eutrophication index. The result is summarized as following. 1) Showing the characteristics of water quality for reservoir in Kunsan, Okgu reservoir and Oknua reservoir was exceeded 4 grades of agricultural water standard in TP, TN and COD. This means that eutrophication was gone much, therefore, water-purity control of reservoir need. While, Mije reservoir that is used to Kunsan citizens' recreation was good in water quality. But, water quality exceeded 4 grades of agricultural Dater standard sometimes. 2) As a results of correlation analysis between variables of water qualify, Interrelation between variables which is connected with eutrophication was expressed good relationship as above 6.000 in correlation coefficients. The correlation coefficient(r) between COD and chlorophyll-a, total phosphorus and chlorophyll-a, total nitrogen and chlorophyll-a were 0.750, 0.720 and 0.600 respectively. Therefore, Change of water quality can grasp according to eutrophication progress degree. 3) If do evaluate to eutrophication by quantitative method which is proposed by OECD, US-EPA and Forsberg & Ryding, in the case of chlorophyll a, Okgu, Oknua and Daewi reservoir was eutrophic state and Mije and Geumgul reservoir was mesotrophic state. But, estimation by TN and TP showed highly eutrophic state (hypereutrophic) in all reservoirs. 4) If do evaluate by eutrophication index which is Carlson's TSI, revised carlson TSI and Walker's index, in the case of chlorophyll a, TSI values of Okgu, Oknua and Daewi reservoir is eutrophic state more than 50 and Mije and Geumgul reservoir was mesotrophic state as range of $40{\sim}50$ in TSI value. But, in the case of TP as nutrients, all reservoirs showed highly eutrophic state which was exceed to 70 in TSI value. According to above results, the water quality for small scale reservoirs in Kunsan is progressing by trophic state. therefore, for continuous use as agriculture water, we had better do establishment of management plan about water quality.

• 한국물환경학회지
• /
• 제29권3호
• /
• pp.400-408
• /
• 2013

Total phosphorus was set as a target indicator to prevent eutrophication and algae growth, etc., in three major rivers (Nakdong River, Geum River and Yeongsang/Seomjin River) for the second phase (2011 ~ 2015) in total maximum daily loads (TMDLs) system. However, total phosphorus management was restrictively introduced, i.e., upstream of the Lake Daechung, in the Geum River watershed. Total phosphorus concentration and trophic levels in downstream of the Lake Daechung (include Mangyeong and Dongjin rivers) were increased more than upstream. Therefore, it is necessary to expand total phosphorus management in all watersheds of the Geum River. If total phosphorus was managed in all area of the Geum River watershed, it is possible to decrease total phosphorus concentration and trophic levels, and solve the unbalanced water quality between up and downstream of the Lake Daechung.

• 생태와환경
• /
• 제35권3호통권99호
• /
• pp.181-186
• /
• 2002

본 연구는 1997년 3월부터 11월가지 아산호 19개 정점에서 부영양화 정도를 평가하기 위하여 이화학적 환경요인을 조사하였다. 수온은 의 $8.3{\sim}35.3{\circ}^C$범위였고　여름철에 수온 약층이 형성되는 것으로 나왔으며 용존산소량도 같은 경향을 보였다. 투명도는 0.1~1m의 범위로 매우 낮았으며 SS는 11.3~2143.3mg/l의 범위로 강우량과 식물플랑크톤의 현존량에 의해 영향을 받는　것으로 나타났다. 영양염 농도는 지천에서 높고 하류로 갈수록 낮아지는 경향을 보였으며 계절적으로는 녹조현상이 일어난 여름과 초가을에 낮았고 초봄과 겨울에는 높았다. Carlson 의한 부양양화도 (Trophic State Index)를 가지고 판정한 아산호의 영양상태는 과영양 상태이었다.

• 한국동물학회:학술대회논문집
• /
• 한국동물학회 1998년도 한국생물과학협회 학술발표대회
• /
• pp.184.1-184
• /
• 1998

No Abstract, See Full Text

• 환경생물
• /
• 제26권3호
• /
• pp.252-263
• /
• 2008

본 연구는 연구의 목적은 총질소(TN), 총인(TP), 엽록소(Chl), 투명도(SD)의 변수를 이용하여 호수의 영양상태(Trophic state)를 평가하였고, 전기전도도에 따르면 부유물질(SS)의 역동성을 비교 평가하여 총질소-엽록소(TN-Chl), 총인-엽록소(TP-Chl), 엽록소-투명도(Chl-SD)의 경험적 모델을 분석하였다. 호소의 영양상태 분석에 따르면, 36개 인공호 중 절반이상이 부영양-과영양화 상태 (Eutrophy-Hypertrophy)로 나타났다. 총인의 월 변이(% Variation)가 최고 500%까지 상회하였으며 특히 8월에는 연중 최고치를 보였다. 한편 총질소의 월 변이는 90% 이하로 나타났으며, 모든 호수에서 평균 총질소 농도는 1.2 mg L$^{-1}$ 이상을 상회하여, 배경 농도가 높은 것으로 나타났다(부영양-과명양화상태). 경험적 모델 분석에 따르면 투명도의 변이는 총인(R$^2$=0.15, p<0.001) 및 총질소 (R$^2$=0.20, p<0.001)보다 주로 엽록소 (R$^2$=0.31, p<0.001)에 의해 설명되는 것으로 나타났다 총인, 총 질소의 비 (TN : TP ratio)의 분석에 따르면, 대부부의 인공호는 조류 생장에 있어 잠재적인 인(P)의 영향을 시사하였다. 따라서 식물성 플랑크톤 성장은 질소보다 인에 의하여 조절 되는 것으로 나타났다. 수질 변수의 연 평균값에 로그-전환(Log$_{10}$ transformation)한 후 실시한 선형 회귀분석에 따르면 엽록소는 총인 및 총질소에 의해 각각 30%, 15% 설명되어, 연관성이 극히 낮은 것으로 나타났다. 그러나 개별 호소에 대한 선형 회귀분석 일부 총인-엽록소가 강한 정 상관관계 (R$^2$=0.62, p=0.002, n=12)를 총질소-엽록소에서는 유의성이 없는 것으로 나타났다(p=0.892, n=12). 상기 연구를 종합해보면 경험적 모델 분석 시 자료의 평균효과(Averaging effect)는 모델의 변이성을 설명하는 데 중요한 것으로 나타났다.

• 생태와환경
• /
• 제38권3호통권113호
• /
• pp.382-392
• /
• 2005

대청호 연중 수질 환경요인의 변화를 해석하고 영양단계를 평가하고자, 1997년부터 2002년까지 수질 환경요인과 수문학적 특성을 조사하였다. 대청호의 표층 수온은 3.2\;{\sim}\;33.1^{\circ}C$로 2월 중순에 가장 낮았다. 탁도는 $0.1\;{\sim}203.5\;NTU$이었지만, 정점 1에서만 30 NTU의 이상이었다. COD의 평균은 $3.6{\pm}1.4\;mg\;O_2\;L^{-1}$이었고, Chl a의 평균 농도는 $9.3{\pm}12.8\;{\mu}g\;L^{-1}$이었다. 총질소는 0.14 ${\sim}$ 5.09 mg N $L^{-1}$ 범위로 4월과 6월부터 8월에 다른 시기보다 높았다, 총인은 $1\;{\sim}\;247\;{\mu}g\;P\;L^{-1}$로, 11월부터 4월까지$10.6\;{\sim}\;18.1\;{\mu}g\;P\;L^{-1}$로 상대적으로 낮다가 5월부터 8월까지 평균 30.0 P $L^{-1}$ 이상으로 증가하였다. TN/TP비의평균은 $98.7{\pm}56.2$이었다. 대청호의 수질은 적용한 지수와 시기별로 영양단계평가 등급이 중영양단계 또는 부영양단계로 판정되었다.

• 생태와환경
• /
• 제45권1호
• /
• pp.82-92
• /
• 2012

본 연구에서는 금강수계의 저수지들의 공간적 계절적 영양상태를 분류하였으며, Chl-$a$와 전기전도도와 총인 등의 수질 변수들간의 상관관계를 분석하였다. 금강수계의 각 저수지들은 총인 값에 따라 2개의 빈영양상태와 15개의 중영양상태, 14개의 부영양상태로 분류되었으며, 각각의 총인 값은 9.3~9.4 ${\mu}g\;L^{-1}$, 10.3~19.2 ${\mu}g\;L^{-1}$, 38.9~117.1 ${\mu}g\;L^{-1}$로 나타났다. 전기전도도, 총인, Chl-$a$는 강우특성을 반영하였으며, 연평균 총인 값은 연평균 Chl-$a$ 값과 유사한 변이 패턴을 보였다. 한편, 총인에 의한 Chl-$a$의 회귀식은 몇 개의 계절과 영양상태에서 유의성을 나타내었으며, 이는 계절적 강우에 의한 희석효과로 인한 결과로 사료되었다.

• 한국환경보건학회지
• /
• 제35권5호
• /
• pp.376-385
• /
• 2009

The characteristics of Lake Cheonhoji water and sediment were investigated in oder to utilize these as fundamental materials for the management of lake water quality. The hydrographic properties of Lake Cheonhoji which are relatively low chance of nutrients loading from the watershed and a long retention time of lake water, lead to the probability of high lake productivity. It was also observed that lake water showed stratification during summer and complete mixing during fall, even though water depth was relatively shallow. The trophic state was eutrophic to hypertrophic from summer to late fall. The overall properties of the sediment were oligohumic, high ignition loss and high composition of NAIP and Resid.-P, which might serve as potential pollution sources of lake water quality. In laboratory scale experiments, it was observed that leaching potential of nutrients in the sediment was greatly dependant upon water temperature and dissolved oxygen. Finally, water pollution in Lake Cheonhoji was considered to be largely due to the adverse cycle of uncontrollable eutrophication, which resulted in the subsequent occurrence of dead algae and animal plankton, organic sedimentation, reduction of dissolved oxygen and nutrients leaching, which again reinforced the cycle of eutrophication in the lake.

• 한국환경과학회지
• /
• 제13권4호
• /
• pp.389-401
• /
• 2004

Seasonal and vertical distribution of water quality were investigated from May 2001 to June 2002 in Kumoh reservoir located nearby Kumi City, Kyungpook. Kumoh reservoir that lost the role of agricultural irrigation is currently of rapid eutrophication. The vertical distribution of DO was observed clinograde with hypolimnetic anoxic zone. T-P concentrations at the surface ranged from 0.008 to 0.152 mgP/L and T-N concentrations ranged from 1.4 to 3.0 mgN/L. The vertical and seasonal variation of T-N was smaller than T-P. DOC concentrations, indicator of organic matter pollution, ranged from 2.8 to 5.4 mgC/L. Apportionment of Total-DOC (T-DOC) indicated that 14% of T-DOC was attributed to Labile-DOC(L-DOC) and the rest was due to Refractory-DOC(R-DOC). The values of TSI(Trophic State Index) ranged between 44 and 52 indicating that Kumoh reservoir is under mesotrophic condition. The results of this study indicate that Kumoh reservoir is likely to be under influence of eutrophication and thus water quality will be aggravated. Therefore, the Kumoh reservoir requires further treatment to improve water quality and a plan of the reusing water resource should be developed.

• 해양환경안전학회지
• /
• 제3권S1호
• /
• pp.77-90
• /
• 1997

the observations in situ and the seawater analyses were conducted in July and August, 1996 for the purpose of evaluating the characteristics of seawater quality centered on eutrophication in Mokpo harbour. By applying the OECD standards of trophic classification to the parameters such as secchi depth, total inorganic nitrogen, phosphate phosphorus and chlorophyll-a, the trophic level of seawater in Mokpo harbour was evaluated to be in eutrophic state in summer. By the estimation of pollution index with relation to eutrophication, the seawater quality of Mokpo harbour was evaluated to be under the regular grades and this evaluation was found to be different from the results of evaluation obtained by the environmental index of single parameter, chemical oxygen demand. By the estimation of eutrophication index, the seawaters of Mokpo harbour were shown to have the high potentiality of red tide occurrence.