A dilution method for reducing chlorophyll a concentration of downstream reservoir through upstream dam discharge was reviewed at Seungchon Weir and Juksan Weir reservoirs in the Yeongsan River. The applied model equations were divided into 1) a case of accepting the inflow of upstream water with non-discharge state, and 2) a case of accepting the water after discharging the same amount of weir water. We found the positive effect of dilution in chlorophyll a reduction, and accepting upstream water after predischarging is more effective. The larger the amount pre-discharged, the greater the dilution effect. Therefore, under conditions that do not affect the downstream environments of the weir, it is appropriate to pre-discharge high chlorophyll a water first and then dilute it. However, the method of reducing chlorophyll a concentration in weir reservoir using clean upstream water is not recommendable except critical cases. The upstream dams of the Yeongsan River basin were constructed for multipurpose including agricultural use, and discharge of dam water can cause the disputes over water rights. Therefore, the dilution method can only be implemented limitedly when weir reservoirs are critically polluted and upstream dam water is sufficient enough not to affect agricultural use in Yeongsan River watersheds.

Abstract
서 론
재료 및 방 법
    1. 조사대상지와 검토조건
    2. 예측모델 식
결과 및 고 찰
적 요
REFERENCES

• 박한수(전남대학교 대학원 생물과학,생명기술학과) | Han-Su Park (Department of Biological Sciences and Biotechnology, Graduate School, Chonnam National University, Gwangju 61186, Republic of Korea)
• 이학영(전남대학교 자연과학대학 생물학과) | Hak Young Lee (Department of Biological Science, Chonnam National University, Gwangju 61186, Republic of Korea) Corresponding author