| Author | Triweko, Robertus Wahyudi |
| Call Number | AIT Thesis no. WA-85-29 |
| Subject(s) | Scour (Hydraulic engineering)
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| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Abstract | The purpose of this research is to study the influence of an angle of attack to the maximum depth of scour. An aligned pier at normal discharge may change to an angle of attack at flood flows and vice versa, as a result of the river bed changes. Unfortunately, the maximum depth of scour at an angle of attack will be larger than that of an unsdewed pier. This study is limited to blunt-nosed piers since an skewed pier will act as a blunt-nosed pier, eventhough it is a sharp-nosed pier at zero angle of attack. Theoretical analysis shows that maximum depth of scour depends on the strength of horseshoe vortex system which is initially a function of pier Reynolds number also. The influence of an angle of attack to the maximum depth of scour can be expressed as a coefficient of pier skewness which is defined as the ratio of the maximum depth of scour at an angle of attack to that of unskewed condition. Since the maximum depth of scour is a function of pier Reynolds number, therefore coefficient of pier skewness can be expressed as a function of the ratio of pier Reynolds number, and for the same flow condition it will be a function of the ratio of pier projected width. Experimental results show a good agreement with the theoretical consideration . A general formula for design purposes of the influence of pier skewness to the maximum depth of scour has been derived It was concluded that the expression from shen et al (1966 may be used as an upper envelope of the coefficient of pier skewness. |
| Year | 1984 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Water Resources Research Engineering (WA) |
| Chairperson(s) | Wang, Tsan-Wen |
| Examination Committee(s) | Suphat Vongvisessomjai ;Prida Thimakorn ;Tawatchai Tingsanchali |
| Scholarship Donor(s) | Lee Foundation |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1984 |