抄録
Leftovers of feeds, which were fed to waterfowls by visitors to the park around a pond, are one of the causes of water pollution and eutrophication in the pond. We investigated why visitors have wanted to feed waterfowls. And, we estimated an influence of feeds residue on water quality of the pond. Most of the visitors, who are under the forty years old, thought, “I want to contact with waterfowls.” “I think feeding is good for children as environmental education.” and they wanted to feed waterfowls. These visitors occupied about 40% of the whole visitors. About 36% of COD existing in the pond originated from the leftovers of feeds. Then, we considered a new plan that the feeding action will be compatible with water quality preservation. Based on our simulation analysis, we explained that a feeding pond construction is the best plan for that.
