000			03674nam a2200445 4500
005			20260818155501.0
008			180598 th eng
035			_a.b10035114
099		9	_aAIT Thesis no. WA-83-19
100	1		_aGunaranchithan, Veerasingham
245	1	2	_aA model of ripple formation on sloping beaches
260			_aBangkok : _bAsian Institute of Technology, _c1982
300			_a57 p.
490	1		_aThesis ; _vno. WA-83-19
500			_aA thesis submitted in partial fulfillment of the requirement for the degree of Master of Engineering, School of Engineering and Technology
502			_aThesis (M.Eng.) - Asian Institute of Technology, 1982
520			_aTo observe the transient rate of the growth of a ripple and a fully developed ripple on a sloping bed, experiments· are carried out in a flume (40m x 1m x 1m). Two types of medium sand materials with median particle diameter 0.29 mm and 0.45 -mm are used. For coarser sand, a bed slope of 1/10 and 1/20 is used while for finer sand, 1/20 is used. The maximum particle velocity and excursion are calculated from small-amplitude wave equations. The experimental range of the water -wave characteristic for the sand is greatly reduced by the size limitations of the flume. A dimensional analysis is first made to find the predominant factors affecting the behaviour of ripple formation and these are, the relative smoothness of the bed sediment and the densiometric sediment Froude Number. Analyses of ripple formation and sediment transport from an initially sloping bed based on the obtained experimental results and on continuity equation of sediment transport are then followed. Empirical equations are obtained for the transient and fully developed ripple height and length. It is found that the ripple height and length depend only on water particle excursion for low bed velocity and depend on densiometric Froude Number for high bed velocity. Ripple skewness is related to the velocity asymmetry in dimensionless form. An expression is derived for the transport of sediment related to the ripple parameters. Due to the difficulty in analyzing, the ripple celerity involving in this equation is not evaluated empirically in respect to time.
650		0	_aSlopes (Soil mechanics)
650		0	_aRipple-marks
700	0		_aSupbat Vongvisessomjai, _eChairperson
700	0		_aTawatchai Tingsanchali, _eExamination Committee
700	0		_aPrida Thimakorn, _eExamination Committee
710	2		_aRoyal Government of The Netherlands, _eScholarship Donor
810	2		_aAsian Institute of Technology. _tThesis ; _vno. WA-83-19
856			_3Full-Text _uhttp://203.159.5.9/ait-thesis/detail.php?q=B21419
907			_a.b10035114 _bmnait _cs
902			_a241009
998			_b2 _c951012 _dm _ea _fs _g2
945			_lmnait
945			_lmnait
945			_lmnarc
945			_lmnait
942			_c20
942			_c40
909			_aBarcode : 30050003050183 _bCREATED : 1994-05-16 _cRECORD # : i10020433 _dLPATRON : 0 _eLCHKIN : - _f# RENEWALS : 0 _g# OVERDUE : 0 _hIUSE3 : 0 _iTOT CHKOUT : 0 _jTOT RENEW : 0
909			_aBarcode : 30050003050175 _bCREATED : 1994-05-16 _cRECORD # : i10020445 _dLPATRON : 0 _eLCHKIN : - _f# RENEWALS : 0 _g# OVERDUE : 0 _hIUSE3 : 0 _iTOT CHKOUT : 0 _jTOT RENEW : 0
909			_aBarcode : 30050160035910 _bCREATED : 2016-05-02 _cRECORD # : i12877682 _dLPATRON : 0 _eLCHKIN : - _f# RENEWALS : 0 _g# OVERDUE : 0 _hIUSE3 : 0 _iTOT CHKOUT : 0 _jTOT RENEW : 0
909			_aBarcode : 30050121099419 _bCREATED : 2023-12-10 _cRECORD # : i13469162 _dLPATRON : 0 _eLCHKIN : - _f# RENEWALS : 0 _g# OVERDUE : 0 _hIUSE3 : 0 _iTOT CHKOUT : 0 _jTOT RENEW : 0
999			_c77452 _d77452