1. Ph.D. Student, Dept. of Civil, Environmental, and Natural Resources Engineering, Luleå Univ. of Technology, 971 87 Luleå, Sweden.
2. Assistant Professor, Dept. of Civil, Environmental, and Natural Resources Engineering, Luleå Univ. of Technology, 971 87 Luleå, Sweden.
3. Professor, Dept. of Civil, Environmental, and Natural Resources Engineering, Luleå Univ. of Technology, 971 87 Luleå, Sweden.
4. Assistant Professor, Dept. of Civil, Environmental, and Natural Resources Engineering, Luleå Univ. of Technology, 971 87 Luleå, Sweden (corresponding author).