The impact of climate change on the performance of irrigation sand traps in a Volcanic River Basin in Indonesia | |
| Author | Pradipta, Ansita Gupitakingkin |
| Call Number | AIT Diss. no.WM-24-05 |
| Subject(s) | Climatic changes--Indonesia--Volcanic River Basin Irrigation--Indonesia--Volcanic River Basin Sand--Indonesia--Volcanic River Basin |
| Note | A dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Engineering in Water Engineering and Management |
| Publisher | Asian Institute of Technology |
| Abstract | The Progo-Opak-Serang (POS) River Basin in Indonesia is a volcanic basin crossing provinces, spanning a total area of 5,241 km2. It is a basin with substantial sedimentation potential; 38% of its area is classified as critical land. The situation worsens due to climate change, which will significantly impact the river system in terms of soil erosion rates. The presence of significant sedimentation in the basin is anticipated to impact the performance of sand traps as the initial stage of sedimentation prevention in irrigation networks. This study aims to evaluate the impact of climate change on the performance of sand traps in irrigation schemes within Indonesia's volcanic basin. Several models were utilized, such as the Revised Universal Soil Loss Equations (RUSLE) to assess sediment yields within the basin, the Hydrologic Engineering Center's River Analysis System (HEC-RAS) to evaluate the sand traps hydraulic performance, General Circulation Models (GCM) to predict future climate, and the Integrated Valuation of Ecosystem Services and Tradeoffs (InVEST) to estimate the impact of future climate on sediment export. The findings indicate that regions with steep and mountainous terrain generally experience high sediment yields above 180 tons/ha/year. According to four specified criteria, the research focus for representing the Progo, Opak, and Serang Watershed was chosen to be Badran, Blawong, and Pengasih Sand Traps, respectively. It is evident that the Badran Sand Trap is currently performing exceptionally well during both the operational and flushing periods. It is anticipated that the future precipitation, under the Shared Socioeconomic Pathways (SSP) 5-8.5 scenario, will significantly increase the sediment export in the far future, surpassing 10% compared to historical values. Future sediment loads in the sand traps cause changes in the flushing frequency, discharge, and duration. The flushing discharge for Badran, Blawong, and Pengasih Sand Traps increases to 20%, 7%, and 42%, respectively. Furthermore, the Badran Sand Trap will continue to perform well in the future, whereas the Blawong and Pengasih Sand Traps will operate poorly. The performance evaluation of sand traps can serve as valuable input in a suitable sustainable management system to support irrigation modernization, thereby enhancing food and water security. |
| Year | 2024 |
| 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, Mohana Sundaram;Ho, Huu Loc (Co-Chairperson) |
| Examination Committee(s) | Shrestha, Sangam;Virdis, Salvatore G.P. |
| Scholarship Donor(s) | His Majesty the King's Scholarships (Thailand) |
| Degree | Thesis (Ph.D.) - Asian Insitute of Technology, 2024 |