03772nam a2200421 4500 20260818095338.0 030698 th eng .b1023195x AIT Thesis no. WA-87-13 Huynh Ngoc Trien Effects of tidal barrier on estuarine hydrodynamics and sedimentation Bangkok : Asian Institute of Technology, 1987 85 p. Thesis ; no. WA-87-13 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, 1987 Tidal barrier is a very common structure in estuarine areas. It serves as a barrier against the salinity intrusion or high tide to avoid flooding. When the tidal barrier is constructed there are some other effects besides the main purposes. In the present study, the hydrodynamic effect is considered with 3 different cases of barrier operation: fully closed, fully open and partly open. The analytical solution developed by Prof. Suphat Vongvisessomjai and Somchai Rojakamthorn is used for fully open case; a reduction factor of tidal amplitude at the barrier is found for partly open case then the former solution can be used again with the modified tidal amplitude. For the fully closed case the Chezy's equation is used to describe the velocity field. Subsequently, the sedimentation effect of the tidal barrier is considered. From the mass transport equation, a first order of Galapatti's asymptotic solution is used with some simplifications. For the steady, unsteady uniform cases, analytical solutions in closed forms are obtained; for the general unsteady slowly varying flow a simplified governing equation is derived and from this equation, simple numerical calculation can be proceeded. The results of velocity field are good; for the sediment part, the computed results agree very well with experimental results ( for sinusoidal velocity field ) and can fairly describe the sediment distribution for the unsteady flow in the Savannah estuary. Then both hydrodynamics and sedimentation models are applied to the Chao Phraya estuary. For the 4 cases of 1962, the results showed that both models could be applied for a rough estimation. It is also estimated t hat the barrier will cause some deposition in the river due to the decrease of turbulence when t he barrier is fully closed. Hydrodynamics Estuarine sediments Suphat Vongvisessomjai, Chairperson Tawatchai Tingsangchali, Examination Committee Preecha Kamronrithisorn, Examination Committee Government of New Zealand, Scholarship Donor Asian Institute of Technology. Thesis ; no. WA-87-13 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B19432 .b1023195x mnait s 240329 2 951012 m a s 0 mnait mnait mnarc 20 40 Barcode : 30050003052577 CREATED : 1994-05-17 RECORD # : i10282944 LPATRON : 1012277 LCHKIN : 2010-02-18 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 1 TOT RENEW : 1 Barcode : 30050003052585 CREATED : 1994-05-17 RECORD # : i10282956 LPATRON : 1013094 LCHKIN : 2000-05-11 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 5 TOT RENEW : 2 Barcode : 30050160034723 CREATED : 2016-12-02 RECORD # : i12880218 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 35429 35429 0 0 0 0 MAIN MAIN mnait 2026-08-18 0 AIT Thesis no. WA-87-13 30050003052577 2026-08-18 09:53:38 1 2026-08-18 20 0 0 0 0 MAIN MAIN mnait 2026-08-18 0 AIT Thesis no. WA-87-13 30050003052585 2026-08-18 09:53:38 2 2026-08-18 20 0 0 0 0 MAIN MAIN mnarc 2026-08-18 0 AIT Thesis no. WA-87-13 30050160034723 2026-08-18 09:53:38 2026-08-18 40