Abstract:Rapid urbanization has taken place in Southeast Asian megacities located in the lower river delta basins, and a mixed urban-rural land use is being adopted in the urban fringes. Industrial land uses in particular are being mixed with farmlands, including paddy fields and orchards. Urban suburbs, 30-35 km east of central Bangkok, now face the risk of floods and droughts. Therefore, adaptive land and water management is urgently needed. This research focuses on paddy fields as spaces for water regulation and loc… Show more
“…Land inundation is emerging as a pressing global challenge in the wake of climate change (Kundzewicz et al, 2014;Rajkhowa & Sarma, 2021). The trajectory of urban expansion is encroaching on prime agricultural landscapes (Yokota et al, 2020). The repercussions of land change, driven by socioeconomic and biophysical variables, often influence climate-related hazards and increase vulnerability to river flooding (Vadrevu et al, 2017).…”
The Bangkok Metropolitan Region (BMR), located in the Chao Phraya River basin delta, is particularly vulnerable to floods, with susceptibility heightened by geographical aspects and rapid urbanization. This study aimed to assess spatiotemporal flood exposure and allow proper flood‐risk recognition among all stakeholders through a three‐phase flood exposure assessment. First, land use and land cover (LULC) changes were identified based on a 30‐year Landsat time series. Second, built‐up areas that overlapped with past flood inundation maps were designated as flood exposure areas. Third, a rainfall‐runoff inundation (RRI) model simulated the 2011 Thailand Flood, the largest on record, by analyzing inundation depth implications across three decades. The findings revealed a dramatic increase in the use of built‐up areas and the associated flood exposure. In 1992, built‐up areas accounted for approximately 20% of the total area, sharply increasing to nearly 45% by 2022, according to the LULC classification. The flood exposure increased from 648.83 km2 in 1992 to 1681.26 km2 by 2022, demonstrating a linear trend. Notably, the catastrophic 2011 flood did not inhibit urbanization in flood‐prone areas, highlighting the need for robust policies, such as the segmentation of flood‐risk zones, to mitigate future exposure in the region.
“…Land inundation is emerging as a pressing global challenge in the wake of climate change (Kundzewicz et al, 2014;Rajkhowa & Sarma, 2021). The trajectory of urban expansion is encroaching on prime agricultural landscapes (Yokota et al, 2020). The repercussions of land change, driven by socioeconomic and biophysical variables, often influence climate-related hazards and increase vulnerability to river flooding (Vadrevu et al, 2017).…”
The Bangkok Metropolitan Region (BMR), located in the Chao Phraya River basin delta, is particularly vulnerable to floods, with susceptibility heightened by geographical aspects and rapid urbanization. This study aimed to assess spatiotemporal flood exposure and allow proper flood‐risk recognition among all stakeholders through a three‐phase flood exposure assessment. First, land use and land cover (LULC) changes were identified based on a 30‐year Landsat time series. Second, built‐up areas that overlapped with past flood inundation maps were designated as flood exposure areas. Third, a rainfall‐runoff inundation (RRI) model simulated the 2011 Thailand Flood, the largest on record, by analyzing inundation depth implications across three decades. The findings revealed a dramatic increase in the use of built‐up areas and the associated flood exposure. In 1992, built‐up areas accounted for approximately 20% of the total area, sharply increasing to nearly 45% by 2022, according to the LULC classification. The flood exposure increased from 648.83 km2 in 1992 to 1681.26 km2 by 2022, demonstrating a linear trend. Notably, the catastrophic 2011 flood did not inhibit urbanization in flood‐prone areas, highlighting the need for robust policies, such as the segmentation of flood‐risk zones, to mitigate future exposure in the region.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.