1. Center
for Regional Environment Research, National Institute for Environmental Studies, 16-2, Onogawa, Tsukuba, Ibaraki 305-8506, Japan
2. Graduate
School of Engineering, Kyoto University, Kyoto daigaku-katsura, Nishikyo-ku, Kyoto 615-8530, Japan
3. Center
for Social and Environmental Systems Research, National Institute for Environmental Studies, 16-2, Onogawa, Tsukuba, Ibaraki 305-8506, Japan
4. Fukushima
Branch, National Institute for Environmental Studies, 2-16, Sugitsumacho, Fukushima-shi, Fukushima 960-8670, Japan