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首页> 外文期刊>Polish Journal of Environmental Studies >Changes in Water and Sediment Quality of a River Being Impounded and Differences Among Functional Zones of the New Large Tropical Hydroelectric Reservoir
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Changes in Water and Sediment Quality of a River Being Impounded and Differences Among Functional Zones of the New Large Tropical Hydroelectric Reservoir

机译：大型热带水电水库蓄水河流水沙质量变化及功能区差异

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Though more large tropical reservoirs arc being constructed to meet the increasing energy demand, knowledge on the impact of damming a tropical river and the differences along the river after its impoundment is scarce. Thus, the present study aimed to increase our understanding of such differences both longitudinally and vertically. Water and sediment samples were collected at three different functional zones in the Murum River basin 10 months after impoundment began. Results show that the impoundment has an impact on both the water and sediment. Longitudinal variations of water and sediment characteristics were observed at different functional zones. The upstream riverine zone subjected to anthropogenic activities serves as the main input of suspended solids and nutrients to the reservoir. The nitrogen changed from a high nitrate and low ammonia condition prior to impoundment to a low nitrate and high ammonia condition due to the accumulation of organic matter and slow nitrification rate after impoundment. In the transitional and lacustrine zones, vertical stratifications of dissolved oxygen and temperature were observed. The thickness of a well-oxygenated column for sensitive aquatic organisms was only 2 m at some stations. Water quality in all zones showed impairment during the filling phase as compared to the good water quality index before impoundment. The reduction of suspended solids in the surface water column in the transitional and lacustrine zones is a positive change for aquatic organisms. Sediment characteristics were found to be distinct in the transitional zone, where it was lower in sand and higher in silt, clay, organic carbon and nutrients in contrast to the riverine zone. Clay increased in all zones after the impoundment. There is an urgent need to reduce the pollutants input from the upstream riverine zone.
机译：尽管正在建造更多的大型热带水库来满足不断增长的能源需求，但对于将热带河筑坝的影响以及在其蓄水后沿河的差异的知识仍然很少。因此，本研究旨在增进我们对纵向和纵向这种差异的理解。蓄水开始后10个月，在穆鲁姆河盆地的三个不同功能区收集了水和沉积物样本。结果表明，蓄水对水和沉积物都有影响。在不同功能区观察到水和沉积物特征的纵向变化。受人为活动影响的上游河流带是水库中悬浮固体和养分的主要输入。由于有机物的积累和蓄积后硝化速度变慢，氮从蓄积前的高硝酸盐和低氨状态变为低硝化和高氨的状态。在过渡带和湖相带，观察到溶解氧和温度的垂直分层。在某些站点，用于敏感水生生物的充氧柱的厚度仅为2 m。与蓄水前的良好水质指数相比，所有区域的水质在充水阶段均显示出损害。过渡带和湖相带地表水柱中悬浮固体的减少对水生生物是一个积极的变化。在过渡带发现沉积物特征是明显的，与河床带相反，在沙地中沉积物较低，而淤泥，粘土，有机碳和养分含量较高。蓄水后，所有区域的粘土都增加了。迫切需要减少上游河流地区的污染物输入。

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