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        검색결과 2

        1.
        2014.09 KCI 등재 구독 인증기관 무료, 개인회원 유료
        In this study, we evaluated the temporal changes of water quality in the 90 reservoirs in Korea and the relationships between water quality and their environmental factors in the reservoirs for effective management of reservoirs. The majority of study reservoirs were categorized as the eutrophic state based on Carlson’s trophic index. Among 90 reservoirs, more than 55.0% were nutrient-rich based on TSITP in each month, where more than 50.0% were nutrient-rich based on TSIChl-a from June to November. Seasonal Mann- Kendall test was used to analyze temporal variation of water quality in the selected 60 reservoirs using monthly data from 2004 to 2008. The results showed that 27 (45.0%) reservoirs showed the improvement of water quality based on TP and Chl-a concentrations, while 14 (23.3%) and 11 (18.3%) reservoirs displayed the degradation of water quality based on TP and Chl-a concentrations, respectively. Meanwhile, a self-organizing map classified the study reservoirs into five groups based on differences of hydrogeomorphology (altitude, catchment area, bank height, lake age, etc.). Physicochemical factors and land use/cover types showed clear differences among groups. Finally, hydrogeomorphology of reservoirs were related to water quality, indicating that the hydrogeomorphological characters strongly affect water quality of reservoirs.
        4,500원
        2.
        2005.08 KCI 등재 서비스 종료(열람 제한)
        본 연구의 목적은 농업용 저수지 유입부에 설치된 3가지 유형(준설형, 차수막형, 보조댐형)의 침강지에 대한 수질정화효율 평가와 수질정화효율 면에서 유리한 침강지의 유형과 적정규모를 살펴보는데 있다. 이를 위해서 주요 수질 항목에 대한 정화효율과 침강지 설치전후의 퇴적물의 이화학적특성을 조사하였다. 수질정화효율은 침강지 유형, 수질항목 및 조사시기에 따라 에서 사이의 넓은 변동을 보였다. 농도회귀법(ROC)으로 평가한 설계정화효율은 준설형이 , 차수막형이