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035 _a.b10070084
099 9 _aAIT Thesis no. WA-85-7
100 1 _aGunaratna, Priyantha Parakum
245 1 3 _aAn analytical model of ripple formation
260 _aBangkok :
_bAsian Institute of Technology,
_c1984
300 _a81 p.
490 1 _aThesis ;
_vno. WA-85-7
500 _aA thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Engineering and Technology
502 _aThesis (M.Eng.) - Asian Institute of Technology, 1984
520 _aAn analytical study of ripple formation and its effects on sediment transport are carried out. An initial dimensional analysis identifies the predominant factors affecting the behaviour of ripple formation as the relative smoothness of bed sediment and the densiometric sediment Froude number; An exponentially decaying transient function related to these parameters can be used to describe the ripple geometry. The expressions developed for ripple are applied to determine the resulting sediment transport based on the continuity equation of sediment transport. The effects of transient ripple growth and different variations of ripple celerity on sediment transport is investigated. A study on turbulent boundary layer formed due to the presence of ripple and the resulting sediment suspension is made. The rate of suspended sediment transport is determined from a velocity profile and a mean concentration profile. Finally based on the results of suspended sediment transport, an attempt is made to discuss the movement of suspended sediment. It is found from the study that the ripple celerity has a strong influence on the magnitude and direction of sediment transport in the transient state. The analysis of suspended sediment transport revealed that in general sediment particle velocity is a fraction of the water particle velocity.
650 0 _aRipple-marks
700 0 _aSuphat Vongvisessomjai,
_eChairperson
700 1 _aWang, Tsan-Wen,
_eExamination Committee
700 0 _aTawatchai Tingsanchali,
_eExamination Committee
710 2 _aCarl Duisberg Gesellschaft e.v. (CDG),
_eScholarship Donor
810 2 _aAsian Institute of Technology.
_tThesis ;
_vno. WA-85-7
856 _3Full-Text
_uhttp://203.159.5.9/ait-thesis/detail.php?q=B20135
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