000			03477nam a2200445 4500
005			20260818213433.0
008			150698 th eng
035			_a.b10588668
099		9	_aAIT Thesis no. WA-91-15
100	1		_aParvez, Shah Nawshad
245	1	0	_aScour in front of a seawall
260			_aBangkok : _bAsian Institute of Technology, _c1991
300			_a78 p.
490	1		_aThesis ; _vno. WA-91-15
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, 1991
520			_aWhen a structure is placed on an erodible bed and is subjected to a current or wave field, scour will most likely occur around the structure. It is very difficult to predict this scour, because the scouring process is more complicated than the normal transport process. Both erosion and sedimentation processes are involved in the movement and transportation of sediment on the seabed which is mainly due to the wave action. Three different types of structures, namely, vertical, inclined and stepped face seawall were tested in this study for comparative study of scour in front of them. An attempt is made to determine the beach profile response due to the presence of various types of structures placed at various positions in response to normally incident wave attack. Throughout the experiments the water depth, beach slope and wave direction were kept constant. It is found from the laboratory experiments that extensive scour occur at the toe of vertical type seawall, minimum scour occur at the toe of stepped face seawall. Further it was observed that storm wave with high wave steepness erode the sandy beach and accumulate in the offshore zone causing shoreline retrogression. It was also found that scour depth is directly related to run up height, reflection coefficient, wave steepness, sand size and above all characteristics of waves.
650		0	_aSea-walls
650		0	_aScour (Hydraulic engineering)
700	0		_aSuphat Vongvisessomjai, _eChairperson
700	0		_aTawatchai Tingsanchali, _eExamination Committee
700	1		_aShibayama, Tomoya, _eExamination Committee
710	2		_aThe Government of Canada (CIDA), _eScholarship Donor
810	2		_aAsian Institute of Technology. _tThesis ; _vno. WA-91-15
856			_3Full-Text _uhttp://203.159.5.9/ait-thesis/detail.php?q=B17756
907			_a.b10588668 _bmnait _cs
902			_a240410
998			_b2 _c951012 _dm _ea _fs _g0
945			_lmnait
945			_lmnait
945			_lmnait
945			_lmnarc
942			_c20
942			_c40
909			_aBarcode : 30050003054771 _bCREATED : 1994-05-18 _cRECORD # : i1074521x _dLPATRON : 0 _eLCHKIN : - _f# RENEWALS : 0 _g# OVERDUE : 0 _hIUSE3 : 0 _iTOT CHKOUT : 0 _jTOT RENEW : 0
909			_aBarcode : 30050003054789 _bCREATED : 1994-05-18 _cRECORD # : i10745221 _dLPATRON : 1010873 _eLCHKIN : 2000-09-10 _f# RENEWALS : 0 _g# OVERDUE : 0 _hIUSE3 : 0 _iTOT CHKOUT : 3 _jTOT RENEW : 0
909			_aBarcode : 30050160033485 _bCREATED : 2016-02-15 _cRECORD # : i12882070 _dLPATRON : 0 _eLCHKIN : - _f# RENEWALS : 0 _g# OVERDUE : 0 _hIUSE3 : 0 _iTOT CHKOUT : 0 _jTOT RENEW : 0
909			_aBarcode : 30050121028301 _bCREATED : 2022-10-18 _cRECORD # : i13408380 _dLPATRON : 0 _eLCHKIN : - _f# RENEWALS : 0 _g# OVERDUE : 0 _hIUSE3 : 0 _iTOT CHKOUT : 0 _jTOT RENEW : 0
999			_c104707 _d104707