閉鎖性水域へ流出する汚濁量の削減方策の検討〈諌早湾調整池とその流域〉

抄録

At Isahaya of Nagasaki, Japan, a big project called construction of sea-dyke and reclamation project is now going on. It is well known that deterioration of water quality has been frightened in a closed water body, if runoff load of pollutants is not sufficiently controlled. In this paper, pollutant runoff loads from the watershed into the regulation pond of Isahaya are first identified, classifying those from point and non-point sources. On the other hand, it becomes very urgent to reduce the pollutant runoff loads, so efficiency of constructed wetland as one of the Best Management Practices (BMPs) is briefly discussed, based on a field observation and an experiment in campus of Nagasaki University. Finally, some discussion has been done, related to a strategy for reducing the pollutant runoff loads into the regulation pond of Isahaya.