1. Associate Professor, Dept. of Engineering Geology and Hydrogeology, Univ. of Sciences, Hue University, 77 Nguyen Hue, Hue City 530000, Vietnam (corresponding author). ORCID: .
2. Professor Emeritus, Yamaguchi Univ., 2-16-1 Tokiwadai, Ube, Yamaguchi 755-8611, Japan.
3. Section Manager, Coastal Engineering Division, Fukken Co. Ltd., 2-10-11 Hikarimachi, Higashi-ku, Hiroshima 732-0052, Japan.
4. Associate Professor, Dept. of Engineering Geology and Hydrogeology, Univ. of Sciences, Hue Univ., 77 Nguyen Hue, Hue City 530000, Vietnam.
5. Researcher, Institute of Geological Sciences, Vietnam Academy of Science and Technology, Hanoi 100000, Vietnam. ORCID: .
6. Lecturer, Dept. of Engineering Geology and Hydrogeology, Univ. of Sciences, Hue Univ., 77 Nguyen Hue, Hue City 530000, Vietnam.