03125nam a2200361 4500 20260817163812.0 251197 th eng .b10100775 AIT Thesis no. 223 Sermpol Ratasuk Atmospheric reaeration in the Chao Phya River estuary Bangkok : Asian Institute of Technology, 1968 171 p. Thesis ; no. 223 A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in the Asian Institute of Technology, Bangkok, Thailand. Thesis (M.Eng.) - Asian Institute of Technology, 1968 Three different methods were used in an attempt to determine the atmospheric reaeration coefficient of the Chao Phya River estuary. One method of calculation using mean tidal velocities and hydraulic depths was found to be inapplicable to the estuary. In the second method, data obtained in a March 1967 pollution survey were used to calculate the reaeration coefficient by making an oxygen balance. This method, in spite of its many disadvantages, gave more reliable results than those given by the other methods, The third method of in-situ direct measurement using a small polythene sphere gave values of the coefficient lower than those obtained using the oxygen balance method. In the oxygen balance method, BOD and dissolved oxygen data were adjusted to half-tide conditions using chlorinity data. A BOD distribution curve and an oxygen sag curve for each rate of river discharge were plotted and mean local BOD and dissolved oxygen concentrations were determined. Local longitudinal dispersion coefficients were calculated using chlorinity data in the reach of high chlorinity and from hydraulic elements in the reach of low chlorinity. These data were used in solving the oxygen balance equation, developed specifically for the Chao Phya River estuary, using an IBM 1130 computer to obtain local values of the reaeration coefficient. The average value of the reaeration coefficient for the Chao Phya River estuary in the dry season, obtained from the oxygen balance method, was 0.205 per day (base 10) and this value is recommended for future use in pollution control work on the estuary. Water Aeration Pescod, M.B., Chairperson Ackermann, Norbert L., Examination Committee Arbhabhirama Anat, Examination Committee Asian Institute of Technology. Thesis ; no. 223 .b10100775 mnait v 260629 3 951012 m a v 0 mnait mnarc 20 40 Barcode : 30050003093456 CREATED : 1994-05-16 RECORD # : i10111578 LPATRON : 1012032 LCHKIN : 1999-01-04 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 1 TOT RENEW : 0 Barcode : 30050160114079 CREATED : 2016-07-04 RECORD # : i12929244 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 9815 9815 0 0 0 0 MAIN MAIN mnait 2026-08-17 0 AIT Thesis no. 223 30050003093456 2026-08-17 16:38:12 1 2026-08-17 20 0 0 0 0 MAIN MAIN mnarc 2026-08-17 0 AIT Thesis no. 223 30050160114079 2026-08-17 16:38:12 2026-08-17 40