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首页> 外文期刊>Hydrology and Earth System Sciences >Impact of the Hoa Binh dam (Vietnam) on water and sediment budgets in the Red River basin and delta
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Impact of the Hoa Binh dam (Vietnam) on water and sediment budgets in the Red River basin and delta

机译:华平大坝(越南)对红河流域和三角洲的水和沉积物预算的影响

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The Hoa Binh dam (HBD), located on a tributary of the Red River in Vietnam, has a capacity of 9.45 x 10(9) m(3) and was commissioned in December 1988. Although it is important for flood prevention, electricity production and irrigation in northern Vietnam, the Hoa Binh dam has also highly influenced the suspended sediment distribution in the lower Red River basin, in the delta and in the coastal zone. Its impact was analysed from a 50-year data set of water discharge and suspended sediment concentration (1960-2010), and the distribution of water and sediment across the nine mouths of the delta was simulated using the MIKE11 numerical model before and after the dam settlement. Although water discharge at the delta inlet decreased by only 9 %, the yearly suspended sediment flux dropped, on average, by 61% at Son Tay near Hanoi (from 119 to 46 x 10(6) t yr(-1)). Along the coast, reduced sedimentation rates are coincident with the lower sediment delivery observed since the impoundment of the Hoa Binh dam. Water regulation has led to decreased water discharge in the wet season (-14% in the Red River at Son Tay) and increased water discharge in the dry season (+12% at the same station). The ratios of water and suspended sediment flows, as compared to the total flows in the nine mouths, increased in the northern and southern estuaries and decreased in the central, main Ba Lat mouth. The increasing volume of dredged sediments in the Haiphong harbour is evidence of the silting up of the northern estuary of Cam-Bach Dang. The effect of tidal pumping on enhanced flow occurring in the dry season and resulting from changed water regulation is discussed as a possible cause of the enhanced siltation of the estuary after Hoa Binh dam impoundment.
机译:越南红河支流的Hoa Binh大坝(HBD)的容量为9.45 x 10(9)m(3),于1988年12月投入使用。尽管对防洪很重要,但电力生产在越南北部以及灌溉方面,Hoa Binh大坝还严重影响了红河下游流域,三角洲和沿海地区的悬浮泥沙分布。根据其50年的排水量和悬浮泥沙浓度数据集(1960-2010年)分析了其影响,并使用MIKE11数值模型模拟了大坝前后的三角洲九个口中的水和泥沙分布。沉降。尽管三角洲进口处的排水量仅下降了9%,但河内附近的Son Tay的年悬浮泥沙通量平均下降了61%(从119降至46 x 10(6)t yr(-1))。沿海岸,自Hoa Binh大坝蓄水以来,降低的沉积速率与降低的沉积物输送相吻合。水的调节导致雨季的排水量减少(在Son Tay的红河中为-14%)和旱季的排水量增加(同一站点为+ 12%)。与九个口的总流量相比,水和悬浮泥沙的流量比率在北部和南部河口增加,在中部主要巴勒特河口减少。海防港疏of的沉积物数量增加,证明了金巴赫当河北部河口淤积。讨论了潮汐泵对干旱季节水流增加和水调节变化造成的影响,认为这是造成Hoa Binh大坝蓄水后河口淤积增加的可能原因。

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