Reducing the Risk of Benthic Algae Outbreaks by Regulating the Flow Velocity in a Simulated South-North Water Diversion Open Channel.
Reducing the Risk of Benthic Algae Outbreaks by Regulating the Flow Velocity in a Simulated South-North Water Diversion Open Channel.
复制标题
模拟南水北调明渠流速调节降低底栖藻类爆发风险
DOI：
10.3390/ijerph20043564
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发表时间：
2023-02-17
影响因子：
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通讯作者：
Liu, Xingchen
中科院分区：
文献类型：
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作者：
Sun, Longfei;Wu, Leixiang;Liu, Xiaobo;Huang, Wei;Zhu, Dayu;Wang, Zhuowei;Guan, Ronghao;Liu, Xingchen
中国的南水北调工程导致明渠水流速度降低，增加了底栖藻类群落爆发的风险，从而导致饮用水安全问题。因此，它受到了社会各界的关注。然而，缓解藻类水华风险的监管措施和主要风险引发因素尚不清楚。本研究模拟了南水北调中线河道的河流生态系统。模拟的坡度递增河流流速影响环境因素和底栖藻类的变化，可用于探索调节流速以降低藻类水华风险的可行性。研究发现，在流速为0.211和0.418 m/S的环境中，藻类生物量分别下降了30.19%和39.88%。从硅藻到丝状绿藻的群落结构变化分别为75.56%和87.53%。我们观察到生物多样性的显著差异，特别是在丰富度和均衡度方面。物种的α多样性指数受物理化学环境因子(尤其是流速)的影响。研究表明，流速是影响底栖藻类生长和爆发的主要因素。通过调节水流速度，可以有效地降低明渠藻华发生的风险。这为保障大型水利工程的水安全提供了理论依据。
The reduction in open-channel flow velocity due to China’s South-to-North Water Diversion Project (SNP) increases the risk of benthic algal community blooms resulting in drinking water safety issues. Consequently, it has attracted attention from all walks of life. However, regulatory measures to mitigate the risk of algal blooms and the main risk-causing factors are unclear. This study simulated the river ecosystem of the SNP channel through water diversion. Simulated gradient-increasing river flow velocity affects environmental factors and benthic algal alterations, and can be used to explore the feasibility of regulating the flow velocity to reduce the risk of algal blooms. We found that the algal biomasses in the velocity environments of 0.211 and 0.418 m/s decreased by 30.19% and 39.88%, respectively. Community structure alterations from diatoms to filamentous green algae were 75.56% and 87.53%, respectively. We observed significant differences in biodiversity, especially in terms of richness and evenness. The α diversity index of a species is influenced by physical and chemical environmental factors (especially flow velocity). Our study revealed that flow velocity is the main factor affecting the growth and outbreak of benthic algae. The risk of algal blooms in open channels can be effectively mitigated by regulating the flow velocity. This provides a theoretical basis for ensuring the water safety of large-scale water conservancy projects.