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首页> 外文期刊>Special topics & reviews in porous media >DISSOLUTION AND CONTAMINANT TRANSPORT IN AQUIFERS WITH SPATIALLY AND TEMPORALLY VARIABLE HYDRAULIC PROPERTIES
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DISSOLUTION AND CONTAMINANT TRANSPORT IN AQUIFERS WITH SPATIALLY AND TEMPORALLY VARIABLE HYDRAULIC PROPERTIES

机译：具有时空可变液压特性的含水层中的溶解度和污染物传输

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摘要

In evaluating the potential of entrapped nonaqueous phase liquid (NAPLs) sources to contaminate groundwater or in designing remediation, it is necessary to know the rates at which NAPL dissolves into water. These mass transfer rates significantly influence the downstream contaminant concentration and also the spatial extent of contamination. Understanding the dynamics of the mass transfer process under two-dimensional (2D) flow fields and developing a generalized contaminant transport model is the primary focus of this paper. The NAPL dissolution experiments were conducted in a 2D porous media system for four different initial NAPL saturations (S_n = 0.19; S_n = 0.56; S_n = 0.76; S_n = 0.93) covering extremities from very low to very high NAPL saturations. All the model parameters used in the transport model are either determined experimentally or estimated from empirical relations except for the mass transfer coefficient and relative permeability of the aqueous phase. A total of nine simulations were run with various combinations of mass transfer and relative permeability correlation. The contaminant transport model developed in the present study was sensitive to inaccurate measurements in effective permeability and intrinsic permeability, whereas it is relatively insensitive to variation in dispersivity values within ±1 degree magnitude.
机译：在评估截留的非水相液体（NAPL）源污染地下水的潜力或设计补救措施时，有必要了解NAPL溶于水的速率。这些传质速率显着影响下游污染物浓度以及污染物的空间范围。了解二维（2D）流场下传质过程的动力学并建立广义的污染物迁移模型是本文的主要重点。 NAPL溶出度实验是在二维多孔介质系统中针对四种不同的初始NAPL饱和度（S_n = 0.19; S_n = 0.56; S_n = 0.76; S_n = 0.93）进行的，涵盖了从非常低到非常高的NAPL饱和度的末端。除传质系数和水相的相对渗透率外，所有在运输模型中使用的模型参数都是通过实验确定或根据经验关系估算的。使用传质和相对渗透率相关性的各种组合进行了总共九次模拟。在本研究中开发的污染物传输模型对有效渗透率和固有渗透率的不准确测量敏感，而对分散度值在±1度范围内的变化相对不敏感。

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