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沉积物疏如何改变低地农村河流中的动态?

Qimou Zhang¹, Jiacong Huang², Yulai Ji¹

¹Key Laboratory of Watershed Geographic Sciences, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China; University of Chinese Academy of Sciences, Beijing 10094, China.

Journal of environmental sciences (China)

|July 13, 2024

概括

沉积物疏有效控制低地农村河流中的 (P) 污染,将总P (TP) 减少23%,P排放减少98%. 这凸显了沉积物-水界面对P管理的重要性.

科学领域:

环境科学环境科学
水资源管理水资源管理
欧洲化研究研究欧洲化研究

背景情况:

中国的低地农村河流因人类活动产生的 (P) 过量而面临严重的肥化.
在这些复杂的河流系统中量化的动态是具有挑战性的.
沉积物疏是一种潜在的P控制措施,但其有效性需要详细研究.

研究的目的:

开发和应用一个合模型来描述低地农村河流中的动态.
评估沉积物疏对代表性河流控制的影响.
为在类似的河流系统中提供有效管理策略的见解.

主要方法:

将河-P模型与环境流体动力学代码 (EFDC) 和低地波尔德系统 (PDP) 的动力学模型相结合.
利用来自中国太湖盆地的低地农村河流的两年 (2020-2021) 的数据集.
对总 (TP) 度进行对联模型的校准,实现R2>0.59和RMSE<0.04 mg/L.

主要成果:

沉积物疏在大约300天内证明了P控制的有效性,增加了每年74.8公斤的P保留能力,并将TP度降低了23%.
疏显著减少了沉积物P释放的98%,同时增加了P复悬浮和沉降能力,分别为16%和46%.
沉积物-水界面对于P转移至关重要,再悬浮占TP进口的16%,占TP出口的47%.

结论:

沉积物疏是低地农村河流中控制的可行策略,显著改善了水质和P保持.
沉积物-水界面在调节动态方面发挥着至关重要的作用,强调需要在管理计划中考虑其影响.
建议采用排水沟和有巨型植物的池作为补充方法,以提高这些河流系统中的P保留能力.

关键词:

低地农村河流低地农村河流模型组合模型组合是一种的物质.保持容量的容量保留容量.沉积物疏工作沉积物疏工作

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相关概念视频

The Phosphorus Cycle

The Phosphorus Cycle

Unlike carbon, water, and nitrogen, phosphorus is not present in the atmosphere as a gas. Instead, most phosphorus in the ecosystem exists as compounds, such as phosphate ions (PO43-), found in soil, water, sediment and rocks. Phosphorus is often a limiting nutrient (i.e., in short supply). Consequently, phosphorus is added to most agricultural fertilizers, which can cause environmental problems related to runoff in aquatic ecosystems.

Primary Production

Primary Production

The total amount of energy acquired by primary producers in an ecosystem is called gross primary production (GPP). However, of this energy, producers use some for metabolic processes, and some is lost as heat, decreasing the amount of energy available to the next trophic level. The remaining usable amount of energy is called the net primary productivity (NPP). In terrestrial ecosystems, NPP is driven by climate, while light penetration and nutrient availability drive NPP in aquatic ecosystems.