[1] King Mongkuts Univ Technol Thonburi, Fac Sci, Dept Math, Bangkok 10140, Thailand
[2] King Mongkuts Univ Technol Thonburi, Joint Grad Sch Energy & Environm, Bangkok 10140, Thailand
[3] TEAM Consulting Engn & Management Co Ltd, Water & Environm Expert, Bangkok 10230, Thailand
[4] Royal Thai Navy, Hydrog Dept, Meteorol Div, Sattahip 20180, Chonburi, Thailand