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

2012 ◽  
Vol 26 (16) ◽  
pp. 2411-2420 ◽  
Author(s):  
Taichi Tebakari ◽  
Junichi Yoshitani ◽  
Pongthakorn Suvanpimol
Keyword(s):  
Flow Regime ◽  
River Basin ◽  
Reservoir Operation ◽  
Large Scale ◽  
Chao Phraya River

Impact assessment of reservoir operation for potential adaptation in the upper Chao Phraya River basin

2020 ◽  
Author(s):  
Saritha Padiyedath Gopalan ◽  
Naota Hanasaki
Keyword(s):  
River Basin ◽  
Reservoir Operation ◽  
Catchment Area ◽  
Flood Damage ◽  
Baseline Scenario ◽  
Peak Reduction ◽  
Future Scenario ◽  
Flood Peak ◽  
Chao Phraya River ◽  
The Impact

<p>The increased flood occurrence in the lower reaches of Chao Phraya River Basin, a major river system of Thailand, has caused tremendous economic as well as agricultural losses in the past. Reservoir operation is one of the most influential factors that can alleviate flood damage by controlling the natural flow. Hence, this study examines the effect of reservoir operation on the flood peak reduction for the baseline (1990-1999) as well as future (2090-2099) scenarios under representative concentration pathway (RCP) 6 emission scenario using the H08 global hydrological model with reservoir operation module. The main objectives of the study are; (i) analyze the effect of two largest existing reservoirs of Bhumibol and Sirikit at Nakhon Sawan (catchment area: 109973 km<sup>2</sup>), where major tributaries of the Chao Phraya River join together, and (ii) analyze the effect of a hypothetical dam, located in the upper reaches of Yom River (one of the tributaries of Chao Phraya River), at Sukhothai (catchment area: 12769 km<sup>2</sup>) and Nakhon Sawan for the baseline and future scenarios. For this purpose, the H08 model was calibrated at Nakhon Sawan and validated at 26 gauging stations within the catchment with an average daily and monthly Nash-Sutcliffe efficiency values of 50 and 66% respectively. The results of baseline scenario simulation revealed that the two major reservoirs cause an enormous reduction in the daily peak discharge by 21-52% at Nakhon Sawan, whereas the impact of the hypothetical dam was negligible (3-14%) due to its reduced storage capacity compared with the major reservoirs. On the other hand, the proposed hypothetical dam exhibited significant potential for the flood peak reduction by 15-53% at Sukhothai. Therefore, it can be envisaged that the hypothetical dam could reduce flood damage at the lower reaches of Yom River where flooding is regular due to gentle slope. Further, the simulated change in daily peak discharge without the reservoir effect for the future scenario was -0.55 to 5.78 and -0.72 to 7.68 times higher at Nakhon Sawan and Sukhothai respectively compared with the baseline scenario. The impact of two existing as well the hypothetical reservoirs on flood peak reduction was similar compared with the baseline scenario at Nakhon Sawan as well as at Sukhothai. This further indicates that the changes in discharge due to climate change are larger than those achieved by the reservoir operations for the future scenario even though the simulated discharge highly depends on which general circulation model was used as input.</p>

scholarly journals Hydroclimate variability and its statistical links to the large-scale climate indices for the Upper Chao Phraya River Basin, Thailand

2009 ◽  
Vol 6 (5) ◽  
pp. 6659-6690 ◽  
Author(s):  
N. Singhrattna ◽  
M. S. Babel ◽  
S. R. Perret
Keyword(s):  
Pacific Ocean ◽  
Indian Ocean ◽  
Temperature Gradient ◽  
Atmospheric Circulation ◽  
River Basin ◽  
Large Scale ◽  
Study Results ◽  
Hydroclimate Variability ◽  
The Indian Ocean ◽  
Chao Phraya River

Abstract. The local hydroclimates get impacts from the large-scale atmospheric variables via atmospheric circulation. The developing of their relationships could enhance the understanding of hydroclimate variability. This study focuses on the Upper Chao Phraya River Basin in Thailand in which rainfall is influenced by the Indian Ocean and tropical Pacific Ocean atmospheric circulation. The Southwest monsoon from the Indian Ocean to Thailand is strengthened by the temperature gradient between land and ocean. Thus, the anomalous sea surface temperature (SST) is systematically correlated with the monthly rainfall and identified as the best predictor based on the significant relationships revealed by cross-correlation analysis. It is found that rainfall, especially during the monsoon season in the different zones of study basin, corresponds to the different SST indices. This suggests that the region over the ocean which develops the temperature gradient plays a role in strengthening the monsoon. The enhanced gradient with the SST over the South China Sea is related to rainfall in High Rainfall Zone (HRZ); however, the anomalous SST over the Indian Ocean and the equatorial Pacific Ocean are associated with rainfall in Normal and Low Rainfall Zone (NRZ and LRZ) in the study area. Moreover, the identified predictors are related to the rainfall with lead periods of 1–4 months for the pre-monsoon rainfall and 6–12 months for the monsoon and dry season rainfall. The study results are very useful in developing rainfall forecasting models and consequently in the management of water resources and extreme events.

scholarly journals Effect of Large Scale Dams on Hydrological Regime in the Chao Phraya River Basin, Kingdom of Thailand

2004 ◽  
Vol 48 ◽  
pp. 481-486 ◽  
Author(s):  
Taichi TEBAKARI ◽  
Junichi YOSHITANI ◽  
Chanchai SUVANPIMOL
Keyword(s):  
River Basin ◽  
Large Scale ◽  
Hydrological Regime ◽  
Chao Phraya River
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