Simulating past severe flood events to evaluate the effectiveness of nonstructural flood countermeasures in the upper Chao Phraya River Basin, Thailand

Jamrussri, Sarawut; Toda, Yuji

doi:10.1016/j.ejrh.2017.02.001

Cited by 24 publications

(16 citation statements)

References 41 publications

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“…In this study, the KST dam was considered as a hypothetical one and Simultaneously, analysis of historical hydrological data has shown that the downstream flood risk increases drastically when the discharge at C.2 station is more than 3590 m 3 /s, resulting in huge economic losses in the lower CPRB (Jamrussri & Toda, 2017). Therefore, it is necessary to evaluate the effect of the KST dam in reducing the peak discharge below this threshold values at Y.6 and C.2 stations.…”

Section: Hypothetical Reservoirmentioning

confidence: 99%

Impact assessment of reservoir operation in the context of climate change adaptation in the Chao Phraya River basin

Gopalan

Hanasaki

Champathong

et al. 2020

Hydrological Processes

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Climate change adaptation has become the current focus of research due to the remarkable potential of climate change to alter the spatial and temporal distribution of global water availability. Although reservoir operation is a potential adaptation option, earlier studies explicitly demonstrated only its historical quantitative effects. Therefore, this article evaluated the possibility of reservoir operation from an adaptation viewpoint for regulating the future flow using the H08 global hydrological model with the Chao Phraya River basin as a case study. This basin is the largest river system in Thailand and has often been affected by extreme weather challenges in the past. Future climate scenarios were constructed from the bias‐corrected outputs of three general circulation models from 2080 to 2099 under RCP4.5 and RCP8.5. The important conclusions that can be drawn from this study are as follows: (i) the operation of existing and hypothetical (i.e., construction under planning) reservoirs cannot reduce the future high flows below the channel carrying capacity, although it can increase low flows in the basin. This indicates that changes in the magnitude of future high flow due to climate change are likely to be larger than those achieved by reservoir operation and there is a need for other adaptation options. (ii) A combination of reservoir operation and afforestation was considered as an adaptation strategy, but the magnitude of the discharge reduction in the wet season was still smaller than the increase caused by warming. This further signifies the necessity of combining other structural, as well as non‐structural, measures. Overall, this adaptation approach for assessing the effect of reservoir operation in reducing the climate change impacts using H08 model can be applied not only in the study area but also in other places where climate change signals are robust.

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Section: Hypothetical Reservoirmentioning

confidence: 99%

Impact assessment of reservoir operation in the context of climate change adaptation in the Chao Phraya River basin

Gopalan

Hanasaki

Champathong

et al. 2020

Hydrological Processes

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“…An analysis of variance indicated that reforestation resulted in a significant reduction in runoff and sediment transport. Another study in the Chao Phraya River Basin and based on numerical models [83] showed that specific non-structural measures (reforestation, wetlands, and the combination of both) had considerable potential to reduce peak discharges and flood volumes. Indeed, it was suggested that integration of these proposed non-structural flood countermeasures with the existing countermeasures in the Chao Phraya River Basin would be the most practical way to cope with the challenges of future flood disasters.…”

Section: Discussionmentioning

confidence: 99%

Can Land Cover Changes Mitigate Large Floods? A Reflection Based on Partial Least Squares-Path Modeling

Terêncio

Fernandes

Cortes

et al. 2019

Water

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Common approaches to large flood management are Natural Water Retention Measures and detention basins. In this study, a Partial Least Squares-Path Model (PLS-PM) was defined to set up a relationship between dam wall heights and biophysical parameters, in critical flood risk zones of continental Portugal. The purpose was to verify if the heights responded to changes in the biophysical variables, and in those cases to forecast landscape changes capable to reduce the heights towards sustainable values (e.g., <8 m). The biophysical parameters comprised a diversity of watershed characteristics, such as land use and geology, surface runoff, climate indicators and the dam heights. The results have shown that terrain slope (w > 0.5), rainfall (w > 0.4) and sedimentary rocks (w > 0.5) are among the most important variables in the model. Changes in these parameters would trigger visible changes in the dam wall height, but they are not easily or rapidly modified by human activity. On the other hand, the parameters forest occupation and runoff coefficient seem to play a less prominent role in the model (w < 0.1), even though they can be significantly modified by human intervention. Consequently, in a scenario of land cover change where forest occupation is increased by 30% and impermeable surfaces are decreased by 30%, interferences in the dam heights were small. These results open a discussion about the feasibility to mitigate large floods using non-structural measures such as reforestation.

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“…Therefore, in the absence of some form of compensation, farmers located in irrigated schemes may eventually oppose the use of their land for flood retention. Third, simulations run by Jamrussri and Toda () showed the limited impacts of the Yom‐Nan flood retention project on the flood patterns under the hypothesis that the project would enable the storage of one billion cubic metres of water. Thus, implementing flood retention areas only inside irrigation schemes located in the downstream part of the Yom and Nan River Basins (involving a planned stored volume of 723 million cubic metres) could have limited impacts on the global patterns of flood expansion in the Chao Phraya River Basin.…”

Section: Discussionmentioning

confidence: 99%

Difficult encounters around “monkey cheeks”: Farmers' interests and the design of flood retention areas in Thailand

Trakuldit

Faysse

2019

J Flood Risk Management

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Flood retention areas are being increasingly promoted for flood risk management. People living in these areas will accept them if their interests are taken into account. The present study analyses the extent to which farmers' interests were taken into account in two flood retention projects in Thailand. A feasibility study was conducted in preparation for the first project which included public participation. The second project was a pilot project implemented in the same zone at a small scale. Participants in the public participation process and farmers living in proposed flood retention areas were interviewed for the purpose of the present study. Agreement could have been reached between the farmers and the public agencies concerning the flood retention areas. However, the participation process did not enable frank discussion about the conditions under which farmers would accept the project. The second project was designed without public participation and offered very little compensation to farmers. In countries marked by power imbalances in water resources management, public agencies may impose flood retention areas, but the absence of agreements with farmers can reduce the effectiveness of the measure. Reaching such agreements requires challenging the imbalanced power relationships between farmers and public agencies.

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Simulating past severe flood events to evaluate the effectiveness of nonstructural flood countermeasures in the upper Chao Phraya River Basin, Thailand

Cited by 24 publications

References 41 publications

Impact assessment of reservoir operation in the context of climate change adaptation in the Chao Phraya River basin

Impact assessment of reservoir operation in the context of climate change adaptation in the Chao Phraya River basin

Can Land Cover Changes Mitigate Large Floods? A Reflection Based on Partial Least Squares-Path Modeling

Difficult encounters around “monkey cheeks”: Farmers' interests and the design of flood retention areas in Thailand

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