1. Assistant Professor, Dept. of Civil Engineering, National Institute of Technology Karnataka (NITK), Surathkal 575025, India; formerly, Postdoctoral Fellow, Division of Environmental Science and Technology, Kyoto Univ., Kyoto 606-8502, Japan (corresponding author).
2. Professor, Dept. of Civil Engineering, Kyushu Univ., Fukuoka 819-0396, Japan.
3. Professor, Division of Environmental Science and Technology, Kyoto Univ., Kyoto 606-8502, Japan.
4. Associate Professor, Division of Environmental Science and Technology, Kyoto Univ., Kyoto 606-8502, Japan.