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的内部负载在流中描述的沉积物-水交换模型 (SWEMP):从实验室到现场规模

Toon van Dael¹, Charlotte Vermeiren¹, Erik Smolders¹

¹Division of Soil and Water Management, Department of Earth and Environmental Sciences, KU Leuven, Kasteelpark Arenberg 20 bus 2459, 3001 Leuven, Belgium.

The Science of the total environment

|November 28, 2023

概括

一个新的模型预测河流沉积物释放的,显示夏季P峰是由于低氧,而不仅仅是排放. 增强溶解氧和添加铁可以减少地表水.

科学领域:

环境化学环境化学
水质建模水质建模
地质化学地质化学

背景情况:

河流沉积物和水之间的 (P) 动态显著影响地表水的P度.
沉积物中的依赖氧化吸附和溶解物运输是影响水质的关键过程.

研究的目的:

开发和验证一个反应式运输模型 (SWEMP) 来预测的沉积物-水交换.
为了确定控制沉积物中P释放的因素,并预测河流中的季节性P变化.

主要方法:

开发了的沉积物-水交换模型 (SWEMP),其中包含了依赖氧化还原的P吸附和垂直扩散运输.
校准和验证了模型,使用了来自沉积物-水批次系统,流道和佛兰德河流监测的数据.
输入参数包括沉积物P和度,有机物,溶解氧 (DO),温度和P.排放.

主要成果:

SWEMP准确地预测了溶解P度 (批量平均系数为1.3,流水平均系数为1.1) 和P流量.
流量随着沉积物P:Fe比率,呼吸速率的增加而增加,随着DO和pH的增加而减少.
该模型准确预测了佛兰德河流的月度P度 (10%以内),并确定了内部负载是夏季P峰值的原因.

结论:

河流中的夏季峰主要是由无氧条件下的内部沉积物负荷驱动的,而不是外部排放稀释效应.
降低地表水P的策略包括增加DO,将Fe/Al结合剂添加到沉积物中,并减少P排放.

关键词:

地化学建模地质化学建模释放可以释放.减少性溶解是一种减少性溶解.沉积物-水界面的接口

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