03386nam a2200409 4500 20260818094946.0 200198 th eng .b10227246 AIT Thesis no. 942 Theerawat Tangpanich Effect of grain-size distribution on sediment discharge in a flow Bangkok : Asian Institute of Technology, 1977 98 p. Thesis ; no. 942 A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering of the Asian Institute of Technology, Bangkok, Thailand Thesis (M.Eng.) - Asian Institute of Technology, 1977 The purpose of this study is to investigate the effect of non-uniformity of grain size on sediment discharge in a steady flow. Laboratory experiments have been conducted by using a recirculating flume, in which the graded sediments with a medium diameter of 0.50 mm and a geometric standard deviation of 2.23 have been placed. The suspended load, total load, flow discharge and the water surface slope have been measured for several different flow conditions. The grain-size distributions of transported sediments have also been measured by mechanical sieving method. The values of critical shear stress evaluated by two different methods based on the experimental data are compared with the previous studies by Straub and Shields, and the interaction effect between sediment fractions of different grain size is discussed. The values of sediment transport evaluated by the DuBoys' as well as Engelund and Hansen's formula show quite good agreements with the measured ones, while the Einstein's bed load function is concluded to give considerably smaller values. The sediment load is also evaluated for each grain size fraction, into which the total load is divided, by using the DuBoys ' formula, and is compared with the measured value. It is suggested that in the sediment mixture of non-uniform size, the coarse grains might tend to move more easily as compared with the uniform sediment of the same size, while the fine sediment might be obstructed to move and show smaller discharge. Sedimentation and deposition Watanabe, Akira, Chairperson Prida Thimakorn, Co-Chaiperson Overbeek, Henk Jen, Examination Committee Provincial Government of British Columbia, Scholarship Donor Asian Institute of Technology. Thesis ; no. 942 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B22685 .b10227246 mnait x 250904 2 951012 m a x 0 mnait mnait mnarc 20 40 Barcode : 30050003051124 CREATED : 1994-05-17 RECORD # : i10276336 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050003419743 CREATED : 1994-05-17 RECORD # : i10276348 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050160089792 CREATED : 2016-04-28 RECORD # : i12961012 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 34385 34385 0 0 0 0 MAIN MAIN mnait 2026-08-18 0 AIT Thesis no. 942 30050003051124 2026-08-18 09:49:46 1 2026-08-18 20 0 0 0 0 MAIN MAIN mnait 2026-08-18 0 AIT Thesis no. 942 30050003419743 2026-08-18 09:49:46 2 2026-08-18 20 0 0 0 0 MAIN MAIN mnarc 2026-08-18 0 AIT Thesis no. 942 30050160089792 2026-08-18 09:49:46 2026-08-18 40