000			03091nam a2200385 4500
005			20260818214048.0
008			170698 th eng
035			_a.b10603086
099		9	_aAIT Thesis no.WA-93-20
100	1		_aLu, Thai-hong
245	1	0	_aSimulation of a storm-induced beach profile
260			_aBangkok : _bAsian Institute of Technology, _c1993
300			_a66 leaves : _bill.
490	1		_aThesis ; _vno. WA-93-20
502			_aThesis (M.Eng.) - Asian Institute of Technology, 1993
500			_aA thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering.
520			_aBeach berm and even dunes eroded under storm wave with high water level, will cause material to remove offshore to form a far parallel to the beach, and reach almost the final shape at some ultimate location. Actually wave heights and wave period vary continuously during the storm period, but as a first step of engineering approach, only the fix storm wave heights and period are used to estimate how these wave characters affect bar positions and heights during the course of a storm. This study aim to use the semi-emperical relationship of sediment transport rate propsed by Larson and Kraus (1989) to visualize the incipient formation, growth and movement of a bar during storm period and also to estimate the retreat of foreshore beach under storm action.It is found from the present numerical modeling, that comparing the computed and measured beach profile for 0.22 mm and 0.40 mm sand diameter, it gives good agreement especially at the final state. Model improvement was conducted by two approach, firstly the shape parameter of equilibrium beach profile is substituted by the new relationship with the dimensionless fall velocity and then it can provide better simulation of bar size and location. Secondly the time-dependent of sediment transport rate coefficient is newly proposed and found to be more realistic to the profile of initial state of bar development. Lastly the bar developing and always moving offshore with different speed as time increasing.
650		0	_aBeach erosion
700	0		_aSutat Weesakul, _eChairperson
700	0		_aSuphat Vongvisessomjai, _eExamination Committee
700	1		_aTanaka, Hitoshi, _eExamination committee
710	2		_aThe Government of Republic of China, _eScholarship donor
810	2		_aAsian Institute of Technology. _tThesis ; _vno. WA-93-20
856			_3Full-Text _uhttp://203.159.5.9/ait-thesis/detail.php?q=B16390
907			_a.b10603086 _bmnait _cs
902			_a240410
998			_b2 _c951012 _dm _ea _fs _g0
945			_lmnait
945			_lmnarc
942			_c22
942			_c40
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