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Updated: Jan 14, 2026

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扩散边界层和初始污染在来自异质低透性沉积物的反扩散中的作用:源史逆转独立模型和现场应用

Xiang-Hong Ding¹, Shi-Jin Feng², Sheng Zhang¹

¹School of Civil Engineering, Central South University, Changsha 410075, China.

Journal of hazardous materials

|October 18, 2025

概括

一个新的模型预测了地下水污染的低透性沉积物,考虑到扩散边界层和初始条件而不需要源历史. 这样可以更好地评估持续出现的风险.

科学领域:

环境科学环境科学
水文地质学水文地质学
污染物运输建模污染物运输建模

背景情况:

由于在低透性沉积物 (水域) 中反向扩散而造成的持续的地下水污染,挑战了整治.
现有的模型往往过于简化了扩散边界层 (DBL),初始污染,并依赖于不确定的源耗尽历史.

研究的目的:

引入一个新的分析框架,以预测独立于源历史的反向扩散动态.
将DBL效应,沉积物异质性和空间可变的初始污染物分布明确纳入反向扩散模型.
评估这些因素对羽毛持续性和补救策略的影响.

主要方法:

开发了一个源-历史-反转-独立的分析模型,用于反向扩散.
嵌入的扩散边界层 (DBL) 效应,沉积物异质性和可变的初始污染物分布.
通过控制流室实验,数值模拟和来自四乙烯 (PCE) 污染现场的现场数据验证了模型.

主要成果:

该模型准确地预测了前后扩散行为,证明了羽毛持续性风险.
忽视DBL可以低估尾时间长达40年.
水的异质性和DBL特征 (例如,低质量转移系数k_DBL) 显著影响羽毛的持久性和尾巴时间.

结论:

开发的模型增强了预测准确性和管理长期含水层污染的效率.
抑制DBL的质量转移是一种可行的策略,以减轻反向扩散风险.
准确的建模需要明确考虑DBL,初始度分布和水族群异质性.

关键词:

背部扩散的扩散方式扩散性边界层是一种扩散性边界层.有层次的水族动物.来源-历史-反转-独立性

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