Abstract
In 1980, Large dam project “Kaeng Sue Ten” was proceeded under the cabinet-council’s conclusion. It was planned to be located at Song district in Phrae province on the upstream of the Yom River, Thailand. The purposes of this dam are irrigation and flood mitigation. Unfortunately, the troubles had occurred before the dam was built. The inhabitant who suffered from this project and Non-Governmental Organization (NGO) protested the construction of the dam. Until now, Kaeng Sue Ten dam has not been built yet. However, it is necessary to examine the effect of a new dam construction on the Yom River. We evaluated the impact of the Kaeng Sue Ten dam on seasonal water discharge and suspended sediment transport using hydrological simulations of target year 1995 (representative year of the great flood in the Yom River) and 2001 (representative year of the normal flow in the Yom River). Our study area was the main channel of the Yom River in northern Thailand. We used the 1-km distributed flow routing model (1KFRM) to calculate seasonal change of water discharge at four points. Sediment load was calculated from a regression equation between sediment load and water discharge, using suspended sediment concentrations in monthly river samples taken at two gauging stations. Finally we estimated annual sediment load along the study reach using from both of simulated annual hydrograph and the regression equation. Our simulation results show that after construction of dam, there was moderate decrease in peak discharge volume during rainy season (maximum decrease is 21.8%) and corresponding increase in the subsequent season (maximum increase is 40%). The impact of dam construction to the annual maximum discharge in high-water year was significantly larger than in water year 2001, indicating that the Kaeng Sue Ten operation will provide more effect on a high-flow year than a low-flow year. Accordingly, after dam construction, the sediment transportation decreased about 2% to 9.7% from its former value at Y.14 and Y.6 stations.
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Apichitchat, S., Jung, K. Hydrological simulation for impact assessment of Kaeng Sue Ten dam in Thailand. KSCE J Civ Eng 19, 2325–2332 (2015). https://doi.org/10.1007/s12205-015-0322-3
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DOI: https://doi.org/10.1007/s12205-015-0322-3