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035 _a.b10126764
099 9 _aAIT Thesis no. WA-91-17
100 1 _aRabe, Alan Pielago
245 1 0 _aCalibration of the roughness parameter for steady and unsteady flow models of an irrigation canal
260 _aBangkok :
_bAsian Institute of Technology,
_c1991
300 _a87 p.
490 1 _aThesis ;
_vno. WA-91-17
500 _aA thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Engineering and Technology
502 _aThesis (M.Eng.) - Asian Institute of Technology, 1991
520 _a'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.
650 0 _aIrrigation canals and flumes
650 0 _aHydraulics
700 1 _aLoof, Rainer,
_eChairperson
700 1 _aPaudyal, Guna N.,
_eCo-Chairperson
700 1 _aGupta, Ashim Das,
_eExamination Committee
700 1 _aMurty, V.V.N.,
_eExamination Committee
710 2 _aGovernment of Denmark,
_eScholarship Donor
810 2 _aAsian Institute of Technology.
_tThesis ;
_vno. WA-91-17
856 _3Full-Text
_uhttp://203.159.5.9/ait-thesis/detail.php?q=B17758
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