Optimal mangrove formation based on tsunami inundation simulation with stilt root morphological modeling | |
| Author | Ohira, Wataru |
| Call Number | AIT Diss. no.RS-12-07 |
| Subject(s) | Mangrove forests Coastal forests--Management |
| Note | A dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Remotes Sensing and Geographic Information Systems |
| Publisher | Asian Institute of Technology |
| Series Statement | Dissertation ; no. RS-12-07 |
| Abstract | Mangroves are typical coastal forests in tropical and subtropical regions, that have received widespread attention on its mitigation function for tsunami inundation or other forest environmental services. However, it is difficult for us to make optimized plans for mangrove management because methods to quantify the forest environmental services have not been well established. A numerical simulation is useful to understand the behavior of tsunami inundation flow. Mangrove tree generates arch shaped stilt root that occupies considerable part of the tree. Thus, it is necessary to incorporate the form drag form the stilt root in tsunami inundation simulation. In this study, the morphology of the stilt root was modeled as a function of DBH that was estimated using remote sensing in the study site at Ranong province, southern part of Thailand. ASTER, PALSAR and aerial photographs were used to derive tree stands density and biomass, from which DBH was calculated based on an allometry model. The volume of stilt root and trunk as well as their projected area under water computed in different water level was embedded to the momentum equation for tsunami inundation simulation. Tsunami simulations were performed against the wave observed at Indian Ocean Tsunami in 2004, and the contribution of mangrove for reducing hydrodynamic force at a protected area was quantified. The simulation revealed the significant contribution of mangrove and stilt root in reducing tsunami hydrodynamic force. The reduction rate by mangrove was 55%, while 60% of which was brought by the form drag of stilt root. The house destruction probability estimated using a fragility function has reduced from 18% to 8%, which can be enhanced down to 2% by supplemental plantation in future. The width of the mangrove to bring significant reduction of house destruction rate was found as 200m. This study made it possible to accurately estimate the effect of mangrove in reducing hydrodynamic force considering its unique shape of stilt root. It will contribute to come up with optimized plans of mangrove management |
| Year | 2012 |
| Corresponding Series Added Entry | Asian Institute of Technology. Dissertation ; no. RS-12-07 |
| Type | Dissertation |
| School | School of Engineering and Technology (SET) |
| Department | Department of Information and Communications Technologies (DICT) |
| Academic Program/FoS | Remote Sensing (RS) |
| Chairperson(s) | Honda, Kiyoshi ;Tripathi, Nitin Kumar (Co-Chairperson) |
| Examination Committee(s) | Tripathi, Nitin Kumar ;Pennung Warnitchai ;Sutat Weesakul |
| Scholarship Donor(s) | Asian Institute of Technology Fellowship |
| Degree | Thesis (Ph.D.) - Asian Institute of Technology, 2012 |