Dynamic equilibrium bay shape : a theoretical and empirical approach for engineering application | |
| Author | Chayutpong Manakul |
| Call Number | AIT Diss no.WM-23-03 |
| Subject(s) | Shorelines--Southeast Asia Coastal engineering--Southeast Asia Equilibrium (Physiology)--Analysis |
| Note | A dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Engineering in Water Engineering and Management, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Dissertation ; no. WM-23-03 |
| Abstract | Most of Headland-Bay Beaches (HBBs) on the coasts in the world are in dynamic condition, but nowadays its engineering implication is limited. In this study, a comprehensive framework is developed for categorizing the dynamic beach stability, based on sediment supply ratio (SSR) of the input from upcoast coast and/or estuarine source within the embayment to the output estimated by the well-known longshore sediment transport (LST) equation. This criterion is successfully applied to classify 212 HBBs in Southeast Asia into six sub-types. The results indicate that the number of dynamic HBBs (with sediment supply) is much greater than that of static HBBs (without supply). This highlights the importance of dynamic HBBs and the need for further research. A new dynamic parabolic bay shape and its characteristic equation are validated in the present study, showing high accuracy. The new equation reveals that dynamic HBBs exhibit high sensitivity to low sediment supply and low sensitivity for increasing supply. These findings can be used as an effective tool in coastal management for unstable HBBs. An analytical model using LST equation in polar coordinates is derived to investigate the hydrodynamic and sediment transport processes for dynamic equilibrium bays, and to better compute the planform in the highly curved areas that cannot be achieved using Cartesian coordinates. Headland Control, a coastal stabilization concept applicable to unstable bays, is now extended to include dynamic stable and unstable bays using the validated equations. For protection of dynamic HBBs, method using sediment control and/or combined with headland control is proposed and applied to a case study. It is expected that this framework and coastal stabilization concept for dynamic HBBs can be systematically applied to prototype condition elsewhere in the world. |
| Year | 2023 |
| Corresponding Series Added Entry | Asian Institute of Technology. Dissertation ; no. WM-23-03 |
| Type | Dissertation |
| School | School of Engineering and Technology |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Water Engineering and Management (WM) |
| Chairperson(s) | Shanmugam, Sundaram Mohana;Sutat Weesakul (Co-Chairperson); |
| Examination Committee(s) | Shrestha, Sangam;Sarawut Ninsawat; |
| Scholarship Donor(s) | Royal Thai Government;Asian Institute of Technology Fellowship; |
| Degree | Thesis (Ph. D.) - Asian Institute of Technology, 2023 |