浅い貯水池の水位低下・干し上げに伴う2‐MIBへの影響―渡良瀬貯水池を例にして―
Influences of water level drawdown and bed-drying in a shallow reservoir on production of 2-methylisoborneol

Hiroaki SATOU, Masaaki AMANO
2007 Ecology and Civil Engineering  
Watarase Reservoir, located in Kanto plain in the central part of Japan, has been suffering from the problem of moldy smell in drinking water supplied from the reservoir since its commencement in 1990. The cause of the moldy smell is 2-MIB 2methylisoborneol produced by Phormidium sp. In order to reduce Phormidium taxa, we have conducted field experiments to test the effectiveness of water level drawdown and bed desiccation of the reservoir during early spring. The 9-years trial indicated that
more » ... al indicated that the reservoir bed exposure to the air and the sunlight reduced the annual maximum concentration of 2-MIB. The bottom desiccation has an effect of tormenting Phormidium taxa. While the synchronized observations of algal biomass and 2-MIB concentration suggested that the production of 2-MIB extremely decreased if the season of Phormidium growth was late such as after August. The method of water level control could make an effective measure against 2-MIB problem of drinking water caused by bluegreen algae.
doi:10.3825/ece.10.141 fatcat:vwkwhjx5pvbgjgapeg4ibsbxii