03744nam a2200409 4500 20260818114112.0 050698 th eng .b1028638x AIT Thesis no. WA-88-4 Das, Bitanjaya Flow modeling in an irrigation system Bangkok : Asian Institute of Technology, 1988 102 p. Thesis ; no. WA-88-4 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, 1988 A simulation model for the operation of an irrigation canal system has been developed in this study. The method developed is applied to a hypothetical canal system consisting of main canal and branch canals. Vertical under sluice checks are provided to divide the main canal into reaches and to create higher water surface elevations so as to take out branch canal offtakes and also to control the flows to the branch canals and to the downstream of main canal reach. The model is developed to predict the discharge and depth hydrographs at vital locations in the system and to determine the final gate openings of in-line as well as off- line structures so as to allow predetermined discharge to pass through the check structures. The flow in the canal is considered unsteady and the complete Saint-Venant equations for unsteady flow in open channel is solved numerically by the implicit finite difference scheme with the help of the double sweep method. To start the computations for unsteady flow, initial condition is provided considering steady gradually varied flow and the Newton Raphson iterative procedure is adopted for profile computation. Sensitivity analyses are performed for t he model performance by varying the parameters both hydraulic and numerical . The results from the Newton Raphson method compares well with that of the constant step method. The unsteady flow simulation model is verified with the results of an analytical method and data from other sources. The verification confirms the validity of the model and the solution algorithm incorporated in this study. Lastly, the developed model is applied to a system with varying discharge condition (i.e discharge cutoff) and a solution strategy is presented. The programme developed in FORTRAN 77 is suitable for mainframe as well as for microcomputers. Hydraulics Mathematical models Paudyal, Guna N., Chairperson Gupta, Ashim Das, Examination Committee Loof, Rainer, Examination Committee The Royal Government of The Netherlands, Scholarship Donor Asian Institute of Technology. Thesis ; no. WA-88-4 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B18852 .b1028638x mnait s 240402 2 951012 m a s 0 mnait mnait mnarc 20 40 Barcode : 30050003053047 CREATED : 1994-05-17 RECORD # : i10354190 LPATRON : 1025515 LCHKIN : 2015-12-15 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 1 TOT RENEW : 10 Barcode : 30050120573984 CREATED : 1994-05-17 RECORD # : i10354207 LPATRON : 1011368 LCHKIN : 1998-06-21 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 1 TOT CHKOUT : 1 TOT RENEW : 0 Barcode : 30050160034459 CREATED : 2016-12-02 RECORD # : i1288053x LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 45770 45770 0 0 0 0 MAIN MAIN mnait 2026-08-18 0 AIT Thesis no. WA-88-4 30050003053047 2026-08-18 11:41:12 1 2026-08-18 20 0 0 0 0 MAIN MAIN mnait 2026-08-18 0 AIT Thesis no. WA-88-4 30050120573984 2026-08-18 11:41:12 2 2026-08-18 20 0 0 0 0 MAIN MAIN mnarc 2026-08-18 0 AIT Thesis no. WA-88-4 30050160034459 2026-08-18 11:41:12 2026-08-18 40