02325nam a2200253   450000500170000000800410001703500150005810000280007324500750010126000520017630000100022849000270023850001440026550200580040952012370046765000230170465000370172770000420176470000450180670000470185171000490189881000590194785600650200620260817172438.0120698         th                  eng    a.b101339380 aWudhipong Kittitanasuan10aChanges in channel bed slope due to non-equilibrium sediment transport  aBangkok :bAsian Institute of Technology,c1990  a84 p.1 aThesis ;vno. WA-90-18  aA thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Engineering and Technology  aThesis (M.Eng.) - Asian Institute of Technology, 1990  aAnalytical solutions were determined to predict changes in bed levels of an alluvial channel when the upstream sediment supply in stopped or when the downstream end bed level drops. These solutions were determined by solving the continuity and momentum equations of flow and sediment transport. Two approaches were considered. The first so called the parabolic modeling considers that the friction slope in the flow momentum equation is equal to the bed slope. The second approach so called the hyperbolic modeling considers the friction slope equal to the water surface slope. The analytical solutions determined in this study are compared with the experimental data in this study and those given by Newton (1951) and also with the previous analytical solutions determined by De Vries (1973) and Gill (1983). The results of the comparison verifies the ranges of  applicability given by Ribberlik (1984) of the parabolic and hyperbolic models. In general it is found that the solutions of hyperbolic model provide an more accurate prediction of changes in bed level with time than the parabolic model in the region near to the source of bed change. In the region far from the source of  bed change, both models predict equally good. 0aSediment transport 0aChannels (Hydraulic engineering)0 aTawatchai Tingsanchali, eChairperson1 aGupta, Ashim Das,eExamination Committee1 aAkiyama, Juichiro, eExamination Committee2 aThe Government of Japan, eScholarship Donor2 aAsian Institute of Technology.tThesis ;vno. WA-90-18  3Full-Textuhttp://203.159.5.9/ait-thesis/detail.php?q=B18596