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首页> 外文期刊>Journal of Hydrology >Is water age a reliable indicator for evaluating water quality effectiveness of water diversion projects in eutrophic lakes?
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Is water age a reliable indicator for evaluating water quality effectiveness of water diversion projects in eutrophic lakes?

机译：水龄是否是评估富营养化湖泊调水工程水质有效性的可靠指标？

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Water diversion has been applied increasingly to promote the exchange of lake water and to control eutrophication of lakes. The accelerated water exchange and mass transport by water diversion can usually be represented by water age. But the responses of water quality after water diversion is still disputed. The reliability of using water age for evaluating the effectiveness of water diversion projects in eutrophic lakes should be thereby explored further. Lake Dianchi, a semi-closed plateau lake in China, has suffered severe eutrophication since the 1980s, and it is one of the three most eutrophic lakes in China. There was no significant improvement in water quality after an investment of approximately 7.7 billion USD and numerous project efforts from 1996 to 2015. After the approval of the Chinese State Council, water has been transferred to Lake Dianchi to alleviate eutrophication since December 2013. A three-dimensional hydrodynamic and water quality model and eight scenarios were developed in this study to quantity the influence of this water diversion project on water quality in Lake Dianchi. The model results showed that (a) Water quality (TP, TN, and Chla) could be improved by 13.5-32.2%, much lower than the approximate 50% reduction in water age; (b) Water exchange had a strong positive relationship with mean TP, and mean Chla had exactly the same response to water diversion as mean TN; (c) Water level was more beneficial for improving hydrodynamic and nutrient concentrations than variation in the diverted inflowing water volume; (d) The water diversion scenario of doubling the diverted inflow rate in the wet season with the water level of 1886.5 m and 1887 m in the remaining months was the best water diversion mode for mean hydrodynamics and TP, but the scenario of doubling the diverted inflow rate in the wet season with 1887 m throughout the year was optimum for mean TN and Chla; (e) Water age influenced the effectiveness of water diversion on the improvement in TP, but not in TN and Chla. Therefore, water age solely could not be used to evaluate the restoration of water quality in a eutrophic lake, because geobiochemical processes played a more important role in the growth of algae than did water exchange in Lake Dianchi. (C) 2016 Elsevier B.V. All rights reserved.
机译：调水已被越来越多地用于促进湖泊水的交换和控制湖泊的富营养化。通过调水加速水交换和物质运输通常可以用水龄来表示。但是引水后水质的响应仍存在争议。因此，应进一步探索使用水龄来评估富营养化湖泊中的引水工程有效性的可靠性。滇池是中国半封闭的高原湖泊，自1980年代以来一直遭受严重的富营养化，是中国三大富营养化湖泊之一。自1996年至2015年，投资约77亿美元，并进行了许多项目努力，水质没有明显改善。自中国国务院批准，自2013年12月以来，水已转移到滇池以减轻富营养化。三本研究建立了三维水动力和水质模型，并建立了八种方案，以量化该引水工程对滇池水质的影响。模型结果表明：（a）水质（TP，TN和Chla）可提高13.5-32.2％，远低于水龄降低约50％; （b）换水与平均TP有很强的正相关关系，平均Chla对水转移的响应与平均TN完全相同; （c）水位比分流的流入水量变化更有利于改善水动力和营养素浓度; （d）将湿季分流进水量翻倍的水分配方案，其余月份的水位分别为1886.5 m和1887 m，这是平均水动力和TP的最佳分水方式，但分流方案增加一倍全年平均1887 m的雨季流入量是最佳TN和Chla的最佳值。 （e）水龄影响了TP改善的调水效果，但TN和Chla却没有影响。因此，仅靠水龄不能用来评价富营养化湖泊中水质的恢复，因为地球化学过程在藻类生长中起的作用比滇池水交换更重要。 （C）2016 Elsevier B.V.保留所有权利。

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