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在级联水库系统中评估沉积物动力学:中国川的案例研究

Yuepeng Yin¹, Wen Zhang¹, Xi Cao¹

¹State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu, 610059, China; State Environmental Protection Key Laboratory of Synergetic Control and Joint Remediation for Soil& Water Pollution, College of Ecology and Environment, Chengdu University of Technology, Chengdu, 610059, China.

Journal of environmental management

|September 23, 2023

概括

从水库沉积物中释放的在低水季下游较高,为藻类繁殖提供燃料. 铁 (II) 影响了这种释放,需要下游水质的管理策略.

科学领域:

环境化学环境化学
临界技术临界技术
水生生态学水生生态学

背景情况:

水库从各种上游来源的沉积物中积累 (P).
在水库中沉积物P释放的动态,特别是时空变化,尚不清楚.
这种知识差距阻碍了水库水质和下游生态系统的有效管理.

研究的目的:

为了研究在沉积物和水中的时空动态,在一个级联水库系统内.
为了确定控制来自水库沉积物的释放的关键因素.
评估沉积物释放对下游植物浮游生物群落的影响.

主要方法:

在三个布水库中分析了沉积物和水中的总 (TP).
测量了沉积物的特性,包括有机物质含量和颗粒大小.
在薄膜中使用现场扩散梯度 (DGT) 和现场吸附动力实验来量化P释放流量和平衡度.
评估了Fe (II) 在调节沉积物P释放中的作用.

主要成果:

在下游的低水季节 (LWS) 观察到沉积物和水中TP度升高.
下游沉积物特性 (有机物质较高,颗粒较细) 和延长的液压保留时间 (HRT) 与较高的P水平相关.
沉积物P释放率 (扩散流和平衡P度) 与上游相比,下游显著更高.
Fe (II) 被确定为沉积物P.释放的关键调节者.

结论:

下游布水库在LWS期间表现出增强的P积累和释放,这是由沉积物特性和HRT驱动的.
沉积物P释放大大促进了下游水域的营养物质负载.
联合P负载刺激下游植物浮游生物的生长,特别是蓝藻和绿藻,需要监管干预来缓解藻类繁殖.

关键词:

布式水库的水库是一个水库.薄膜中的扩散梯度 (DGT)P释放的风险 P释放的风险沉积物沉积物是一种沉积物.

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