02572nam a2200253   450000500170000000800410001703500150005810000240007324500660009726000520016330000100021549000220022550001650024750200580041252014280047065000450189865000310194370000470197470000480202170000450206971000850211481000540219985600650225320260818173827.0070198         th                  eng    a.b105188610 aWitaya Chongchareon10aPrediction of salt water concentration at Chao Phya estuaries  aBangkok :bAsian Institute of Technology,c1975  a52 p.1 aThesis ;vno. 738  aA thesis submitted in partial fulfillment of the requirements  for the degree of Master of Engineering of the Asian Institute of  Technology, Bangkok, Thailand.  aThesis (M.Eng.) - Asian Institute of Technology, 1975  aThe M.I,T. Transient Salinity . Intrusion Model was used for  the prediction of salinity distribution in the Chao Phya Estuary. The model is formulated in finite-difference terms using the one dimensional, tidal time, variable area equations of continuity, longitudinal momentum and conservation of salt. The tidal dynamics  equations were solved by explicit scheme while the salt balance  equation was solved by implicit scheme. For a given set of initial  and boundary conditions, the instantaneous tidal motion and salinity distribution can be obtained throughout any specified number of  tidal periods. The effect of boundary conditions was discussed and the  schematization of Chao Phya Estuary from river mouth up to 116 kilometers upstream was presented. The model was calibrated by adjusting the Manning roughness coefficient. The calibrated Manning  roughness coefficient was then used to predict the transient salinity distribution from the mathematical model for three periods each of which having 32 tidal cycles. Records of fresh water inflows, salinity and water surface profiles at the entrance were used as the inputs to the model during the transient runs. The predicted and observed salinity distributions were in good agreement. Finally, the maximum salinity distributions along the estuary at various regulated fresh water discharges were also presented for the purpose of salt water intrusion control.  0aSaline water conversionxChao Phya River 0aEstuariesxChao Phya River1 aArbhabhirama Anat, eExamination Committee1 aNishimura, Hitoshi, eExamination Committee1 aPrida Thimakorn, eExamination Committee2 aKeidanren Foundation and  the Asian Institute of Technology, eScholarship Donor2 aAsian Institute of Technology.tThesis ;vno. 738  3Full-Textuhttp://203.159.5.9/ait-thesis/detail.php?q=B23992