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沉积物减弱和释放在受影响的河流流域中的空间和时间动态

S Li¹, J Arnscheidt¹, R Cassidy²

¹School of Geography and Environmental Sciences, Ulster University, Coleraine, N. Ireland.

|September 29, 2023

概括

河流中的沉积物可以储存 (P),但风暴事件可以释放大量的不稳定P.风险评估必须考虑化学和物理P释放动态,以准确管理水质.

科学领域:

环境科学环境科学
水质管理水质管理
生态系统动力学生态系统动力学

背景情况:

河流中的沉积物可以减轻 (P) 污染,但它们的容量受到时间动态和释放风险的影响.
现有的风险评估往往忽视了沉积物-水相互作用的细微尺度和时间变化.
欧流的流域面临来自输入的高水质压力.

研究的目的:

研究流床沉积物中 (P) 交换潜力 (PEP) 和P分量的时间和空间动态.
评估不同水文条件下的沉积物中P释放的风险,特别是风暴事件.
为了理解物理和化学P释放机制在eutrophic流中的相互作用.

主要方法:

每两周一次,在一年内取取溪床沉积物的空间样本,以确定PEP和P分数 (可变性到反抗性).
高频,同步监测流放电和P度,每隔1小时.
与沉积物动力学和水文事件相关的P载荷离开流域的分析.

主要成果:

酸盐交换潜力 (PEP) 显示出空间和时间的变化,受风暴事件期间沉积物动员的影响.
虽然化学P释放潜力一般较低,但在风暴事件中,不稳定二碳酸二二化物 (B-D) P的物理释放显著,减少了高达84%.
总P和反应性P负载离开流域与这些偶发的P释放事件相关.

结论:

沉积物P的衰减能力是动态的,在暴风雨期间可以通过不稳定P的物理释放而受到损害.
从沉积物中释放P的风险评估需要考虑化学和物理过程,特别是在高流量事件期间.
偶尔释放的P的生物可用性和下游热带影响需要与其他P来源一起进一步评估.

关键词:

欧洲职业职业认证 (EPC)分割法分割法分割法分割法.酸盐的交换潜力可能存在.是一种的物质.溪流沉积物的沉积物水的质量水的质量

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