1 AIT Asian Institute of Technology

Estimation of potential evapotranspiration based on climatological data and its relation to pan evaporation for Thailand

AuthorSomchai Juntharasri
Call NumberAIT Thesis no. 1235
Subject(s)Evaporative power--Thailand
NoteA thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering of the Asian Institute of Technology, Bangkok, Thailand
PublisherAsian Institute of Technology
AbstractIn this study, Potential Evapotranspiration (PET) were computed from Penman, Ivanov, Papadakis, Jensen-Haise, Christiansen-Hargreaves, Turc, Thornwaite and Blaney-Criddle formulas based on the mean monthly meteorological data for 16 synoptic surface observation stations of Meteorological Department, Thailand from 1965 to 1975. The computed PET of each stations and regions were related to U.S. Class - A Pan Evaporation by using simple regression analyses for wet season (April - Sept.), dry season (Oct. - March) and entire year (Jan. - Dec.). Results of regression analysis showed that the computed PET from Penman formula almost always give highest correlation coefficient and lowest standard error of estimate. The relationship developed from Penman formula could be used for estimating PET from U.S. class - A Pan Evaporation for the area nearby the station used in this study. For the other stations, regional correlation could be used. The relationship developed can be. obtained from Appendix C. Frequency distribution of maximum computed PET from Penman formula for each regions were al so developed to be used in designing irrigation system at regional level.
Year1977
TypeThesis
SchoolStudent Research Before 1979
DepartmentOther Field of Studies (No Department)
Academic Program/FoSThesis (Year <=1979)
Chairperson(s)Nielsen, Jens Moller
Examination Committee(s)Apichart Anukulamphai ; Paiboon Prabudham
Scholarship Donor(s)Government of Canada
DegreeThesis (M.Eng. ) - Asian Institute of Technology, 1977


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