000			03623nam a2200397 4500
005			20260818153731.0
008			180698 th eng
035			_a.b10408708
099		9	_aAIT Thesis no.WA-93-15
100	0		_aSoe Myint
245	1	0	_aLongshore current profiles with wave-current interaction
260			_aBangkok : _bAsian Institute of Technology, _c1993
300			_a58, [48] leaves : _bill.
490	1		_aThesis ; _vno. WA-93-15
502			_aThesis (M.Eng.) - Asian Institute of Technology, 1993
500			_aA thesis submitted in partial fulfilment of the requirement for the degree of Master of Engineering.
520			_aThe steady state profile of the longshore current induced by regular, breaking, over a parallel bottom contours of plane and barred beach was studied theoretically and experimentally. A conventional momentum approach was adopted to formulate the governing equation. Wave-current interaction was also induced in the wave propagation model and snell law. The model incorporate new expression for the current effect on longshore velocity profile by using Tanaka's (1992) bottom friction factor of combined wave and current. Numerical approach was used to solve all governing equation. The predicted current profiles were compared with the laboratory experiments of Visser (1991) for plane beach and with the present experiment on barred beach. In order to find the velocity profiles of a barred beach, the experimental measurements were performed in a basin with a pump recirculation through openings in the wave guides. Detailed experimental results were presented for different wave fields for a beach slope and a beach roughness. However the uniformity of the longshore currentwas not well satisfied. Moremodification ofcirculation system was recommended. The computed longshore current profile using wave-current interaction was slightly different from that of no interaction. However for the interaction model the advantage of the input parameter ks was to reflect the physical condition of bed roughness instead of bed coefficient C in bottom shear stress formula. The different lateral mixing formulae was tested and it was found that the slightly change of velocity profile after the peak point and outside the surf zone. For overview the effect was small. Forbarbreak, the secondbreakingpointwas foundin laboratory. Itcould also be simulated in numerical model with different parameter in wave decay model. The two peaks of the velocity profile could be computed and compare with laboratory data. The peak ofthe current velocity profile shifting was also found.
650		0	_aWaves
650		0	_aCoastal engineering
700	0		_aSutat Weesakul, _eChairperson
700	0		_aSuphat Vongvisessomjai, _eExamination Committee
700	1		_aTanaka, Hitoshi, _eExamination committee
710	2		_aFinist Government, _eScholarship donor
810	2		_aAsian Institute of Technology. _tThesis ; _vno. WA-93-15
856			_3Full-Text _uhttp://203.159.5.9/ait-thesis/detail.php?q=B16385
907			_a.b10408708 _bmnait _cs
902			_a240329
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