Impact of large‐scale reservoir operation on flow regime in the Chao Phraya River basin, Thailand

Tebakari, Taichi; Yoshitani, Junichi; Suvanpimol, Pongthakorn

doi:10.1002/hyp.9345

Cited by 49 publications

(28 citation statements)

References 13 publications

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“…Rapidly increasing agricultural land had great effect on run‐off change and thus cannot be neglected in the basin. This was similar with the Chao Phraya River, in which large amounts of irrigation water had changed the annual variability of natural run‐off (Tebakari, Yoshitani, & Suvanpimol, ). Glacial meltwater increased at least 75.2 × 10 8 m 3 during 1960–2003, representing 1.2% of mean annual run‐off at the Bahadurabad station.…”

Section: Discussionsupporting

confidence: 68%

Climate change and its impact on water availability of large international rivers over the mainland Southeast Asia

Liu

Wang

Yao

2018

Hydrological Processes

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Changes in climate and the resulting hydrologic variability are of great concern in international river basins. Based on observed station data, climate change and its impact on water availability in large international rivers across mainland Southeast Asia (MSA) were investigated by a combined method of trend detection and hydrologic budget balance analysis. This method can be applied easily to other studies to evaluate impacts of climate change on run‐off and water resources at the basin scale. Precipitation showed a decreasing trend in the MSA during 1960–2016, especially in the dry season. Decreasing precipitation and increasing evapotranspiration were the main reasons for severe droughts during recent years. Climate change was the main reason for run‐off changes over the MSA. The presence of dams in the upstream region was not enough to change the annual variability of natural run‐off in the Mekong River. Run‐off and precipitation changes showed significant variances in different basins and regions, and in different periods. The overall trend of precipitation and run‐off showed a periodicity of about 35 years. Nonprecipitation effects were also significant in some regions, including increasing irrigation water demand in the Red River and increasing glacial melt in the Brahmaputra River basin. Melt increased at least 75.2 × 108 m3/10a during 1960–2003, representing 1.2% of mean annual run‐off in the Brahmaputra River. The positive effect of glacial meltwater was almost equal to the negative effect of evapotranspiration on run‐off change in the Lancang River. Increasing evapotranspiration played a dominant effect on run‐off changes in the Yarlung Zangbo River basin during 1960–2010.

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Section: Discussionsupporting

confidence: 68%

Climate change and its impact on water availability of large international rivers over the mainland Southeast Asia

Liu

Wang

Yao

2018

Hydrological Processes

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“…[] ascribed the 2011 Thai flood to heavy rainfalls which are not yet attributable to climate change; they stressed the importance of nonmeteorological factors such as reservoir management in setting the scale of the disaster. Other studies in the past also suggest that the two largest reservoirs in the basin, Bhumibol and Sirikit, significantly affect the hydrologic regime in the Chao Phraya River Basin [ Tebakari et al ., ; Komori et al ., ].…”

Section: Introductionmentioning

confidence: 97%

Assessing the impacts of reservoir operation to floodplain inundation by combining hydrological, reservoir management, and hydrodynamic models

Mateo

Hanasaki

Komori

et al. 2014

Water Resources Research

125

105

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A catastrophic flood event which caused massive economic losses occurred in Thailand, in 2011.Several studies have already been conducted to analyze the Thai floods, but none of them have assessed the impacts of reservoir operation on flood inundation. This study addresses this gap by combining physically based hydrological models to explicitly simulate the impacts of reservoir operation on flooding in the Chao Phraya River Basin, Thailand. H08, an integrated water resources model with a reservoir operation module, was combined with CaMa-Flood, a river routing model with representation of flood dynamics. The combined H08-CaMa model was applied to simulate and assess the historical and alternative reservoir operation rules in the two largest reservoirs in the basin. The combined H08-CaMa model effectively simulated the 2011 flood: regulated flows at a major gauging station have high daily NSE-coefficient of 92% as compared with observed discharge; spatiotemporal extent of simulated flood inundation match well with those of satellite observations. Simulation results show that through the operation of reservoirs in 2011, flood volume was reduced by 8.6 billion m 3 and both depth and area of flooding were reduced by 40% on the average. Nonetheless, simple modifications in reservoir operation proved to further reduce the flood volume by 2.4 million m 3 and the depth and area of flooding by 20% on the average. By modeling reservoir operation with a hydrodynamic model, a more realistic simulation of the 2011 Thai flood was made possible, and the potential of reducing flood inundation through improved reservoir management was quantified.

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“…The increase in water demand for production and daily life has motivated humans to construct numerous water control systems, including dams and reservoirs (Moore et al, 2012;Tebakari et al, 2012). Despite their value for water mediation, water control systems can negatively affect ecosystems (Wei et al, 2007;Costa and Soares, 2012).…”

Section: Introductionmentioning

confidence: 99%

Relative effects of human activities and climate change on the river runoff in an arid basin in northwest China

et al. 2013

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Understanding the mechanisms of river runoff variation is important for the effective management of water resources in arid and semi‐arid regions. This study uses long‐term observational data as a basis for examining the effects of human activities and climate change on the runoff variation of Jinghe River Basin, a typical arid inland basin in northwest China. A distributed hydrological model called the Soil and Water Assessment Tool, combined with a sequential cluster method and a separation approach, was used to quantify and distinguish the effects of human activities and climate change on runoff. The hydrological sequence before 1981 can be considered natural. However, human activities have significantly affected runoff since 1981. The runoff reduction caused by human activities between 1981 and 2008 accounted for 85.7% of the total reduction in the downstream of Jinghe River, whereas that caused by climatic variation was only 14.3%. This observation suggests that human activities are the major driver of runoff variation in the basin. Although the role of climate change in driving runoff variation has been identified to be prevalent and dominant in arid regions, this study highlights the importance of human activities. Copyright © 2013 John Wiley & Sons, Ltd.

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Impact of large‐scale reservoir operation on flow regime in the Chao Phraya River basin, Thailand

Cited by 49 publications

References 13 publications

Climate change and its impact on water availability of large international rivers over the mainland Southeast Asia

Climate change and its impact on water availability of large international rivers over the mainland Southeast Asia

Assessing the impacts of reservoir operation to floodplain inundation by combining hydrological, reservoir management, and hydrodynamic models

Relative effects of human activities and climate change on the river runoff in an arid basin in northwest China

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