04324nas|a2200457 i 4500 20260817162532.0 101001s2001 th uzm rtt 00| a1eng d .b11835874 AIT Thesis no. WM-00-09 Khan, Mohammad Arif Badsha Analytical model of salinity intrusion in the lower Meghna estuary, Bangladesh Bangkok : Asian Institute of Technology, 2001 67 leaves Thesis ; no. WM-00-09 A thesis submitted in partial fulfillment of the requirements of the degree of Master of Engineering, School of Engineering and Technology Thesis (M.Eng.) - Asian Institute of Technology, 2001 In the present study, Interaction of tide and river flows in Lower Meghna is investigated using the method of harmonic analysis and analytical solutions. As the records of water level along the river are contributed by various constituents of tide so harmonic analysis has been applied to decompose the complicated interaction of the fresh water discharge with various constituents of tides into its individual interaction with each constituent. Four main constituents are included in this study. Results of water level obtained by applying the analytical model to stations along the Lower Meghna are compared very well with the observed values. In analytical model, the governing equations are solved using the approximation method of perturbation to investigate the interaction of tide and fresh water discharge of lower Meghna river of which the cross-section and width varies exponentially. The zeroth order solution is obtained by direct integration and the IPPEN's solution is adopted for the first order solution. The relationship of important dimensionless parameters of the tide with fresh water discharge, especially the dimensionless damping modulus, has been established. These informations are required to calculate the salinity intrusion in estuaiy. Profiles of maximum and mean salinity as well as the intrusion length along the Lower Meghna river has been investigated. The Lower Meghna River shows a period of low flow in AprilMay. During this period saline water from the sea, under the actions of tide and diffusion, intrudes into the lower reach of the river, causing salinity pollution. Tidal convection of salinity profile has been studied. Flow conditions at different stations during periods of low flow has been investigated. Similar to the interaction of tide and river flow, analytical solutions have been described in decomposing the steady state component of salinity from the unsteady component of tidal convection of salinity. Comparison between computed and observed average salinity along the length from downstream boundary has been found. Saltwater encroachment Bangladesh Lower Meghna estuary Suphat Vongvisessomjai, Chairperson Mark, Ole, Examination committee Izumi, Norihiro, Examination Committee Sutat Weesakul, Examination committee Iida, T., Examination Committee Danida., Scholarship Donor Asian Institute of Technology. Thesis ; no. WM-00-09 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B11193 .b11835874 mnait u 240611 0 000825 m a u 0 mnait mnait mnarc mnarc 20 40 Barcode : 30050120330526 CREATED : 2000-05-13 RECORD # : i12259202 LPATRON : 1026204 LCHKIN : 2017-11-04 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 1 TOT CHKOUT : 6 TOT RENEW : 9 Barcode : 30050120593164 CREATED : 2000-05-13 RECORD # : i12259214 LPATRON : 1026204 LCHKIN : 2016-08-22 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 9 TOT RENEW : 4 Barcode : 30050160042676 CREATED : 2016-03-22 RECORD # : i1290255x LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050121099880 CREATED : 2023-11-10 RECORD # : i13467955 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 5345 5345 0 0 0 0 MAIN MAIN mnait 2026-08-17 50.00 0 AIT Thesis no. WM-00-09 30050120330526 2026-08-17 16:25:32 1 2026-08-17 20 0 0 0 0 MAIN MAIN mnait 2026-08-17 50.00 0 AIT Thesis no. WM-00-09 30050120593164 2026-08-17 16:25:32 2 2026-08-17 20 0 0 0 0 MAIN MAIN mnarc 2026-08-17 0 AIT Thesis no. WM-00-09 30050160042676 2026-08-17 16:25:32 2026-08-17 40 0 0 0 0 MAIN MAIN mnarc 2026-08-17 0 AIT Thesis no. WM-00-09 30050121099880 2026-08-17 16:25:32 3 2026-08-17 20