Experimental study on development of dynamic bay shape (old title) | |
| Author | Chatchai Pedugsorn |
| Call Number | AIT Thesis no.WM-04-07 |
| Subject(s) | Bays Equilibrium |
| 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 | Bay shapes having sediment supply will change its shape from static equilibrium and finally approach equilibrium condition. A series of experimental model of bay beach is carried out to investigate the planform of dynamic bay with different amounts of sediment supplies. Experiments are conducted for 20 and 40 degree wave angle with constant wave condition. There are four cases of different amount of sediment supply for one wave angle. Rate of sediment supply varies from100 gm/min to 550 gm/min. There are totally 8 cases of experiments. Experiment will be conducted for 72 hour for each case. Photographs of bay are taken every hour. There are totally 576 photographs. Data of bay shape are rectified and digitize. The experimental result shows that dynamic equilibrium bay shape can be developed for different amounts of sediment supply. Data of Tan and Chiews experiment (1994) and Xiem experiment (2004) for 30 degree wave angle are used to analyze the characteristic of dynamic bay shape. The transient bay shape is fitted with parabolic equation having parameter . 2 The first part is to determine the parameter () which can describe transient dynamic equilibrium bay shape using parabolic equation. Totally 576 bay pictures were use as data set for determining parameter (). Parameter () has been successfully used in equations for static and dynamic equilibrium bay shape. The result is shown that parameter does not change systematically with time. The second part, parameter () has relation with sediment supply (Q/ lb Q ) which is the same for radius ratio (R/ R0). The third part, relation of indentation ratio (a/ R0) and critical angle (c) versus wave angle () for specific sediment supply (Q/ lb Q ) have been successfully established. Indentation ratio (a/ R0) shows good relationship with sediment supply (Q/ lb Q ). The fourth part, relation of bay area ratio ( A / static A ) is analyzed with sediment supply (Q/ lb Q ) and it show same relationship. The last part is application of dynamic equilibrium bay shape with natural bays in Thailand to check the present proposed result. Two selected bays which are Songkhla bay and Nakhon Si Thammarat bay cover around 400 kilometers shoreline. It shows that analytical result of dynamic bay can fit with actual bay and geomorphological of bay development can be explicitly explained. |
| Year | 2005 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Water Engineering and Management (WM) |
| Chairperson(s) | Babel, Mukand S.;Sutat Weesakul |
| Examination Committee(s) | Dutta, Dushmanta;Suphat Vongvisessomjai |
| Scholarship Donor(s) | Royal Thai Government Fellowship |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 2005 |