Assessment of climate change impacts on water security in the Yang River Basin, Thailand | |
| Author | Thitiphat Ratanawaraha |
| Call Number | AIT Thesis no.CC-18-03 |
| Subject(s) | Climatic changes--Thailand--Yang River Basin Water security--Thailand--Yang River Basin |
| Note | 92 leaves : ill. |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. CC-18-03 |
| Abstract | Due to water related-issues and climate change, this study was designed to assess impacts of climate change on water security in Yang River Basin, Thailand under two scenarios of RCP4.5 and 8.5. Temperatures have been increased and continue to rise according to IPCC’sand TMD’s reportsbecause of climate change. For rainfall, there is no clear evidence that it increases or drops down regarding to its high variation and oscillation over the period.The research was done by gathering secondary data from government offices in the study area. Firstly, meteorological data including maximum and minimum temperature and rainfall was collected from various stations starting from the year of 1986 to 2015as well as hydrological data. Moreover, raw data and future data of RCMs were downloaded from CORDEX data distribution websites for downscaling and correcting biases. This study conducted threeRCMs for comparing and selecting the best model by observing values of R2and RMSE before projecting future climate. For bias correction and downscaling, a method called linear scaling factor was applied to the RCMs to correct biases and project future climate. Secondly,QSWAT was used to simulate flow for estimating present and future water availability as well as water security which is the main goal ofthe study. Lastly, to calculate water security, each dimension and indicator were modulated from other studies and reports of ADB and AWDO. The multiple RCMs of HadGEM3-RA, RegCM4 and CCLM project that there is an increasing trend of maximum and minimum temperature reaching 2.27°C to4.14 °C under RCP 4.5 and RCP 8.5 by 2090s. Rainfall in Yang River Basin will extremely rise in the month of May and Juneaffecting flow but decrease in the beginningand end of the year while there is no clear evidence that rainfall will be increasing or decreasing due to fluctuation of rainfall which depends on time. Due to monthly rainfall, discharge in the basin was projected to shift earlierthree or four months from August, and water availability will slightly decrease in the future under both RCPs. Similarly, score of water security index in each indicator is decreasing. The overall score of baseline is 3.775, and it is observed that water security score will dropto 3.0125 to 3.575 underRCP 4.5 and RCP 8.5 by 2090s. Thus, even though it is decreasing innumerical ways, status will still remain the same as present at medium water security. |
| Year | 2018 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. CC-18-03 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Department of Energy and Climate Change (Former title: Department of Energy, Environment, and Climate Change (DEECC)) |
| Academic Program/FoS | Climate Change and Sustainable Development (CC) |
| Chairperson(s) | Shrestha, Sangam |
| Examination Committee(s) | Datta, Avishek;Duc Hoang Nguyen |
| Scholarship Donor(s) | Royal Thai Government Fellowshi |
| Degree | Thesis (M. Sc.) - Asian Institute of Technology, 2018 |