03787nam a2200397   450000500170000000800410001703500150005809900220007310000250009524500830012026000520020330000100025549000220026550001640028750200580045152018440050965000240235370000360237770000460241370000470245971000550250681000540256185600650261590700250268090200110270599800280271694500100274494500280275494200070278294200070278990901710279690901580296799900150312595201310314095201180327120260817162429.0251197         th                  eng    a.b10082049 9aAIT Thesis no.2300 aChaiwat Changwatchai10aAnalysis of selected commodity flows by water transport in the Chao Phya basin  aBangkok :bAsian Institute of Technology,c1968  a66 p.1 aThesis ;vno. 230  aA thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in the .Asian Institute of Technology, Bangkok, Thailand.  aThesis (M.Eng.) - Asian Institute of Technology, 1968  aThailand is a country of rivers and canals. The waterways of the central plain region are an important means of transporting cargo. This research is an attempt to describe the patterns of movement of selected commodities produced in the central plain region of Thailand and transported to Bangkok by the inland waterway system. The gravity model was investigated to ascertain its applicability to the movements of rice and maize. For rice., calibration of the gravity model for the entire study area failed. It was concluded that travel time had no measurable effect on the rice traffic. The study area was then divided to reflect the location and condition of waterways. The movement of rice from changwads near Bangkok, and chiefly connected to it by canals, generally conformed to the concept of the gravity model. The model was calibrated for two sets of data; correlation coefficients were 0.6 and 0.9. The movement of rice to Bangkok from the northern changwads, located along the main rivers, appeared to be contrary to the concept of the gravity model. It was found that the quantity of rice transported was a direct, rather than inverse, function of the travel time. However, the model was calibrated; for one set of data the correlation coefficient was only 0.07, for the second set of data the correlation was 0.6 The quantity of rice transported from each upcountry changwad to Bangkok appeared to be related to the net production in the changwad. A parabolic curve was fitted to the data; coefficients of 0.8 and 0.7 for the two sets of data resulted from this analysis. An attempt was made to apply the gravity model to the movement of maize along the inland waterways from upcountry changwads to Bangkok. The scatter of data was so great that it was apparent that no rational analysis of the available data would be possible 0aWaterwaysxThailand1 aJones, John Hugh, eChairperson0 a Chai Muktabhant, eExamination Committee1 aArbhabhirama Anat, eExamination Committee2 aAsian Institute of Technology, eScholarship Donor2 aAsian Institute of Technology.tThesis ;vno. 230  3Full-Textuhttp://203.159.5.9/ait-thesis/detail.php?q=B24619  a.b10082049bmnaitcv  a260630  b3c951012dmea  fvg0  lmnait  lmnarcuv.30050160111729  c22  c40  aBarcode : 30050120100176bCREATED : 2014-07-02cRECORD # : i12759193dLPATRON : 0eLCHKIN : -f# RENEWALS : 0g# OVERDUE : 0hIUSE3 : 0iTOT CHKOUT : 0jTOT RENEW : 0  aBarcode : -bCREATED : 2016-08-04cRECORD # : i12930222dLPATRON : 0eLCHKIN : -f# RENEWALS : 0g# OVERDUE : 0hIUSE3 : 0iTOT CHKOUT : 0jTOT RENEW : 0  c4998d4998  00104070aMAINbMAINcmnaitd2026-08-17g50.00l0oAIT Thesis no.230p30050120100176r2026-08-17 16:24:29t2w2026-08-17y22  00104070aMAINbMAINcmnarcd2026-08-17l0oAIT Thesis no.230r2026-08-17 16:24:29w2026-08-17y40z3.00502E+13