| 波浪作用下沉降型憎水性污染物床面释放机理研究:以二氯甲烷为例 |
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| 引用本文： | 韩龙喜,张奕,王晨芳,蒋安祺,孙明园,周星辰.波浪作用下沉降型憎水性污染物床面释放机理研究:以二氯甲烷为例[J].环境工程,2023,41(1):141-148. |
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| 作者姓名： | 韩龙喜 张奕 王晨芳 蒋安祺 孙明园 周星辰 |
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| 作者单位： | 1. 河海大学 浅水湖泊综合治理与资源开发教育部重点实验室, 南京 210098; |
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| 基金项目： | 国家自然科学基金面上项目"事故溢油向环境水体扩散的动力学机理及数学模拟"（51979079） |
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| 摘 要： | 以沉降型憎水性污染物为代表的危险化学品突发性水污染事故发生后，大部分污染物将以液态形式沉积于河床表面，这些物质将作为内源性污染源，缓慢地释放进入水体，持续性地导致区域水质严重污染。选取二氯甲烷为对象，通过波浪水槽实验分析了不同波浪要素(波高、波周期等)对其释放强度的影响程度及响应关系，并建立了释放通量与各波浪动力学因子间的数学回归模型。结果表明：波浪扰动将引起以二氯甲烷为代表的沉降型憎水性污染物明显释放；DCM悬浮颗粒总体积浓度(TVC)总体上随波高的增大而变大，随着波周期的增大而减小；相同波周期情况下，释放通量与波高呈显著指数正相关(R2>0.973);相同波高情况下，释放通量与波周期呈显著对数负相关关系(R2>0.967);进一步建立了释放通量与床面波切应力、床面波浪能量损耗率、近底波浪质点水平速度最大值、单宽总波能及波陡的数学回归模型。该研究可为沉降型憎水性污染物水质预报的源强确定提供理论依据及计算方法，进而为完善该类污染物水质预报及风险预警的理论体系提供思路及方法。
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| 关 键 词： | 波浪作用 沉降型憎水性污染物 河(海)床表面 释放强度 数学回归模型 |
| 收稿时间： | 2022-01-13 |
EFFECT OF WAVES ON RELEASE MECHANISM OF SETTLING HYDROPHOBIC POLLUTANTS FROM THE RIVERBED: A CASE STUDY ON DICHLOROMETHANE |
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| Affiliation: | 1. Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake of Ministry of Education, Hohai University, Nanjing 210098, China;2. College of Environment, Hohai University, Nanjing 210098, China |
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| Abstract: | This research is intended to study the effect of waves on the release of settling hydrophobic pollutants, which have been deposited on the riverbed surface after sudden water pollution accidents. Those contaminants will slowly diffuse from the riverbed into the overlying water body through hydrodynamic action, causing ongoing and serious water pollution. By taking dichloromethane as a typical contaminant, the response relationship between the release strength and wave elements (wave height, wave period) were analyzed through flume experiments. The mathematical regression model between the release flux and wave dynamics factors were established. The results suggested that wave disturbance caused the obvious release of settling hydrophobic pollutants. The TVC of suspended particles in DCM increased with the increase of wave height and decreases with the increase of wave period. For the same wave period, there was a significant exponential positive correlation between the release flux and wave height (R2>0.973). For the same wave height, there was a significant logarithmic negative correlation between the release flux and the wave period (R2>0.967). Besides, the mathematical relationships between the release flux and wave dynamic factors were established. Thus, this study offered a solution to solve the source term quantification problem of the differential equation of convective diffusion, which can provide the basis for further developing the mathematical models of these pollutants. |
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