03694nam a2200409 4500 20260818175452.0 050698 th eng .b1054463x AIT Thesis no. WA-88-9 Luo, Ching-ruey Rating curve of flood hydrograph with downstream tide Bangkok : Asian Institute of Technology, 1988 154 p. Thesis ; no. WA-88-9 A thesis submitted in partial fulfilment of the requirement for the degree of Master of Engineering, School of Engineering and Technology Thesis (M.Eng.) - Asian Institute of Technology, 1988 For a steady flow, the .rating curve is unique for a nonerodable section where the flow is uniform, but it is a loop for an erodible section when the flow is nonuniform. unsteady flow, the rating curve does exist, but it is complicated, i.e. relationship between water level and velocity effected by flood hydrograph or tide. more flow A more general relationship between water level and flow velocity (or discharge) with flood hydrograph from upstream and tide from downstream for time-dependent is derived analytically from diffusion equation and continuity equation. The upstream and downstream boundary conditions are expressed in terms of harmonic functions rather than a step function. The analytical solutions are compared with the numerical results obtained by using finite . difference model with implicit scheme based on the complete Sanit-Venant equations for unste"dy flow in open channel. It is found from the study that: the peak flow times at different locations are shifted due to the kinematic wave velocity; therefore, the rating curves at different locations are spread, not complete a loop like peacock tail feather. The rating curves for the subcritical flows are below the line of Y* = q*, and h~ supercritical flow rating curves are above y* = q*. The dime1:si0nless amplitude due to downstream tide is still a function of time not only function of position. The comparison between the analytical results and numerical results are in good agreement, not only for the weighting factor, Pt = 0.70, but also for Pt = 0.50. This analytical model can be used without any sophisicated computing machine; in fact, a simple desk calculator and a table of error function are sufficient in carrying out the computation based on the analytical solution. Hydraulics Graphic methods Suphat Vongvisessomjai, Chairperson Tawatchai Tingsanchali, Examination Committee Nielsen, Steen Asger, Examination Committee Taiwan Provincial Government, Chinese Taipei, Scholarship Donor Asian Institute of Technology. Thesis ; no. WA-88-9 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B18857 .b1054463x mnait s 240409 2 951012 m a s 0 mnait mnait mnarc 20 40 Barcode : 30050003053146 CREATED : 1994-05-18 RECORD # : i10683537 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050003053138 CREATED : 1994-05-18 RECORD # : i10683549 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050160034418 CREATED : 2016-12-02 RECORD # : i12880577 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 97458 97458 0 0 0 0 MAIN MAIN mnait 2026-08-18 0 AIT Thesis no. WA-88-9 30050003053146 2026-08-18 17:54:52 1 2026-08-18 20 0 0 0 0 MAIN MAIN mnait 2026-08-18 0 AIT Thesis no. WA-88-9 30050003053138 2026-08-18 17:54:52 2 2026-08-18 20 0 0 0 0 MAIN MAIN mnarc 2026-08-18 0 AIT Thesis no. WA-88-9 30050160034418 2026-08-18 17:54:52 2026-08-18 40