Regional-scale flood impacts on a small mountainous catchment in Thailand under a changing climate
Extreme rainfall and flooding are common during the summer monsoon season in Thailand. In this study, we utilized Robust Empirical Quantile Mapping (RQUANT) to correct the bias in precipitation, and total runoff data obtained from the latest Couple Model Intercomparison Project phase 6 (CMIP6) for t...
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| Format: | Article |
| Language: | English |
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IWA Publishing
2023-12-01
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| Series: | Journal of Water and Climate Change |
| Subjects: | |
| Online Access: | http://jwcc.iwaponline.com/content/14/12/4782 |
| _version_ | 1797202754376040448 |
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| author | Sawitree Rojpratak Seree Supharatid |
| author_facet | Sawitree Rojpratak Seree Supharatid |
| author_sort | Sawitree Rojpratak |
| collection | DOAJ |
| description | Extreme rainfall and flooding are common during the summer monsoon season in Thailand. In this study, we utilized Robust Empirical Quantile Mapping (RQUANT) to correct the bias in precipitation, and total runoff data obtained from the latest Couple Model Intercomparison Project phase 6 (CMIP6) for the upper Lam Takong river basin. Five different methods were employed to estimate the river discharge and four estimations based on Budyko functions. Our analysis revealed that the ‘Total runoff’ method yielded the most accurate representation of the observed discharge. Impacts of change in land use are examined in terms of compound roughness. The Multi-Model Ensemble (MME) precipitation under medium-emission (SSP2-4.5) and high-emission (SSP5-8.5) scenarios is projected to increase by 5.74 and 10.91%, respectively. Correspondingly, the discharges are expected to increase by 4.57 and 11.05% for the far-future periods. In general, the Flo-2D model satisfactorily simulated the water level in the main channel but it underestimated small inundation depth (<0.5 m) across the floodplain. Comparing inundation maps among different scenarios and timelines, changes in the inundation area were relatively small (0.05%), especially when compared to changes in floodplain storage (6.85%) due to the mountainous nature of the river basin.
HIGHLIGHTS
Utilizing the internal variable from the CMIP6 database to create inputs to flood simulation model.;
Investigation of the functional form (aridity index) for the small mountainous river basin.;
Selection of suitable observed data from several world databases.;
Investigating the well-known bias correction method (RQUANT).;
Examining the flood mitigation measures for this particular small mountainous river basin.; |
| first_indexed | 2024-03-08T17:45:02Z |
| format | Article |
| id | doaj.art-8f42c449266b4995b02ab8f2782aed74 |
| institution | Directory Open Access Journal |
| issn | 2040-2244 2408-9354 |
| language | English |
| last_indexed | 2024-04-24T08:08:28Z |
| publishDate | 2023-12-01 |
| publisher | IWA Publishing |
| record_format | Article |
| series | Journal of Water and Climate Change |
| spelling | doaj.art-8f42c449266b4995b02ab8f2782aed742024-04-17T08:41:39ZengIWA PublishingJournal of Water and Climate Change2040-22442408-93542023-12-0114124782480110.2166/wcc.2023.527527Regional-scale flood impacts on a small mountainous catchment in Thailand under a changing climateSawitree Rojpratak0Seree Supharatid1 Climate Change and Disaster Center, Rangsit University, Pathumthani 12000, Thailand Climate Change and Disaster Center, Rangsit University, Pathumthani 12000, Thailand Extreme rainfall and flooding are common during the summer monsoon season in Thailand. In this study, we utilized Robust Empirical Quantile Mapping (RQUANT) to correct the bias in precipitation, and total runoff data obtained from the latest Couple Model Intercomparison Project phase 6 (CMIP6) for the upper Lam Takong river basin. Five different methods were employed to estimate the river discharge and four estimations based on Budyko functions. Our analysis revealed that the ‘Total runoff’ method yielded the most accurate representation of the observed discharge. Impacts of change in land use are examined in terms of compound roughness. The Multi-Model Ensemble (MME) precipitation under medium-emission (SSP2-4.5) and high-emission (SSP5-8.5) scenarios is projected to increase by 5.74 and 10.91%, respectively. Correspondingly, the discharges are expected to increase by 4.57 and 11.05% for the far-future periods. In general, the Flo-2D model satisfactorily simulated the water level in the main channel but it underestimated small inundation depth (<0.5 m) across the floodplain. Comparing inundation maps among different scenarios and timelines, changes in the inundation area were relatively small (0.05%), especially when compared to changes in floodplain storage (6.85%) due to the mountainous nature of the river basin. HIGHLIGHTS Utilizing the internal variable from the CMIP6 database to create inputs to flood simulation model.; Investigation of the functional form (aridity index) for the small mountainous river basin.; Selection of suitable observed data from several world databases.; Investigating the well-known bias correction method (RQUANT).; Examining the flood mitigation measures for this particular small mountainous river basin.;http://jwcc.iwaponline.com/content/14/12/4782bias correctioncmip6flo-2dflood simulationshared socioeconomic pathway |
| spellingShingle | Sawitree Rojpratak Seree Supharatid Regional-scale flood impacts on a small mountainous catchment in Thailand under a changing climate Journal of Water and Climate Change bias correction cmip6 flo-2d flood simulation shared socioeconomic pathway |
| title | Regional-scale flood impacts on a small mountainous catchment in Thailand under a changing climate |
| title_full | Regional-scale flood impacts on a small mountainous catchment in Thailand under a changing climate |
| title_fullStr | Regional-scale flood impacts on a small mountainous catchment in Thailand under a changing climate |
| title_full_unstemmed | Regional-scale flood impacts on a small mountainous catchment in Thailand under a changing climate |
| title_short | Regional-scale flood impacts on a small mountainous catchment in Thailand under a changing climate |
| title_sort | regional scale flood impacts on a small mountainous catchment in thailand under a changing climate |
| topic | bias correction cmip6 flo-2d flood simulation shared socioeconomic pathway |
| url | http://jwcc.iwaponline.com/content/14/12/4782 |
| work_keys_str_mv | AT sawitreerojpratak regionalscalefloodimpactsonasmallmountainouscatchmentinthailandunderachangingclimate AT sereesupharatid regionalscalefloodimpactsonasmallmountainouscatchmentinthailandunderachangingclimate |