03324nam a2200433 4500 20260817172101.0 150698 th eng .b10126764 AIT Thesis no. WA-91-17 Rabe, Alan Pielago Calibration of the roughness parameter for steady and unsteady flow models of an irrigation canal Bangkok : Asian Institute of Technology, 1991 87 p. Thesis ; no. WA-91-17 A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Engineering and Technology Thesis (M.Eng.) - Asian Institute of Technology, 1991 'This study is conducted for estimating the roughness coefficient for steady and unsteady flow condition s of anon prismatic irrigation canal. The research comprises of three models: (a) geometric elements calculat1 on model. (b) steady flow simulation model, and (c) unsteady flow simulation model. As a preliminary data processing a computer program using FORTRAN was developed for computing the geometric elements at any desired water stage. Cross-sectional geometry of each gaging station was measured and the variations in geometr.lc elements was incorporated in the model. The calibration procedure tries t o match the observed and simulated water level hydrographs at selected observation stations. The widely applied Double-Sweep method of linearization for solving the Saint-Venant's equations was used with the 4-point implicit finite difference scheme. In order to mat.ch the observed steady flow t o the simulated flow, different values of 'n' were computed by iterative procedure. Optimum value of the roughness coefficient was calibrated in the unsteady flow simulation model. The model developed was applied to the main reach of the Thabua Sub-Project. of the Phitsanulok Irrigation Project in Northern Thailand. Results of calibration show acceptable ranges of 'n ' values as recommended in hydraulic literature. Irrigation canals and flumes Hydraulics Loof, Rainer, Chairperson Paudyal, Guna N., Co-Chairperson Gupta, Ashim Das, Examination Committee Murty, V.V.N., Examination Committee Government of Denmark, Scholarship Donor Asian Institute of Technology. Thesis ; no. WA-91-17 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B17758 .b10126764 mnait s 240411 2 951012 m a s 0 mnait mnait mnarc 20 40 Barcode : 30050003054805 CREATED : 1994-05-16 RECORD # : i1014321x LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050003054813 CREATED : 1994-05-16 RECORD # : i10143221 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050160033451 CREATED : 2016-02-15 RECORD # : i12882100 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 14745 14745 0 0 0 0 MAIN MAIN mnait 2026-08-17 0 AIT Thesis no. WA-91-17 30050003054805 2026-08-17 17:21:02 1 2026-08-17 20 0 0 0 0 MAIN MAIN mnait 2026-08-17 0 AIT Thesis no. WA-91-17 30050003054813 2026-08-17 17:21:02 2 2026-08-17 20 0 0 0 0 MAIN MAIN mnarc 2026-08-17 0 AIT Thesis no. WA-91-17 30050160033451 2026-08-17 17:21:02 2026-08-17 40