1. Lecturer, School of Civil Engineering and Architecture, Mongolian Univ. of Science and Technology, Ulaanbaatar 14191, Mongolia; Research Fellow, Institute of Hydraulic Engineering and Water Resources Management, Vienna Univ. of Technology, Karlsplatz 13/222, Vienna 1040, Austria (corresponding author). ORCID: .
2. Guest Professor, Institute of Hydraulic Engineering and Water Resources Management, Vienna Univ. of Technology, Karlsplatz 13/222, Vienna 1040, Austria.
3. Professor, Dept. of Civil and Environmental Engineering, Nagaoka Univ. of Technology, 1603-1 Kamitimioka, Nagaoka 940-2188, Japan.