03429nam a2200421 4500 20260818212834.0 070198 th eng .b10573926 AIT Thesis no. 733 Akhtar, Muhammad Ashraf River siltation due to tin mining Bangkok : Asian Institute of Technology, 1975 93 p. Thesis ; no. 733 A thesis submitted in partial fulfillment of the requirements for the Degree of Master of Engineering at the Asian Institute of Technology, Bangkok, Thailand. Thesis (M.Eng.) - Asian Institute of Technology, 1975 The primary purpose of this research was to investigate and evaluate tin mining activities as a source of sediments in the rivers which were causing a severe siltation problem in the Ranong estuary of Thailand. The study was conducted on the three rivers, draining from tin mining areas and were responsible for transporting a huge quantity of sediments into the estuary. As there were no gaging stations on the rivers before the present study, a tank model was calibrated and developed to simulate long term run-off in one of the rivers using-nine-year daily rainfall as input. Unit hydrograph of Thailand was, then, used to find the long term runoff in the other two rivers in order to develop flow duration curves. Functional relationships between water discharge and sediment load were developed to determine sediment rating curves. From the flow-duration and sediment rating curves of the rivers, it was estimated that about 1.7 million tons of sediments were being transported and silted in the estuary and river mouths every year. In this quantity, tin mining areas contributed about 99 percent of the sediments and only 1 percent sediments were from the forest land. Predicted sediment load and sediment dredging data for the silting reach were compared to estimate distribution of sediments in the estuary. It was found that about 34 percent of sediments were being deposited in the silting reaches at the river mouths and remaining 66 percent passed to the estuary. Tin mines and mining Thailand Ranong Sedimentation and deposition Suphat Vongvisessomjai, Chairperson Nishimura, Hitoshi, Examination Committee Prida Thimakorn, Examination Committee British Government and Habour Department of Thailand, Scholarship Donor Asian Institute of Technology. Thesis ; no. 733 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B23987 .b10573926 mnait x 260424 2 951012 m a x 0 mnait mnarc mnait 20 40 Barcode : 30050003034757 CREATED : 1995-10-15 RECORD # : i10725325 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050160093133 CREATED : 2016-04-22 RECORD # : i12949140 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050121098007 CREATED : 2023-10-10 RECORD # : i13467888 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 102382 102382 0 0 0 0 MAIN MAIN mnait 2026-08-18 0 AIT Thesis no. 733 30050003034757 2026-08-18 21:28:34 2 2026-08-18 20 0 0 0 0 MAIN MAIN mnarc 2026-08-18 0 AIT Thesis no. 733 30050160093133 2026-08-18 21:28:34 2026-08-18 40 0 0 0 0 MAIN MAIN mnait 2026-08-18 0 AIT Thesis no. 733 30050121098007 2026-08-18 21:28:34 1 2026-08-18 20