Results of column tests performed on large undisturbed samples are presented, focusing on the behavior of the hydrodynamic dispersion coefficient ( $$D_h$$ D h ). Tests were performed employing petroleum produced water from onshore facilities percolating sandy soils with different fine contents. To measure the organic content of the produced water, this work used the parameter TPH (total petroleum hydrocarbons). The obtained results show that the longitudinal dispersion coefficient ( $$\alpha _L$$ α L ) varies with flow velocity ( $$v_s$$ v s ) and that both the ratio between the hydrodynamic dispersion and diffusion coefficients ( $$D_h/D$$ D h / D ) and $$\alpha _L$$ α L are approximately two orders of magnitude higher than the values normally found in the literature for the same type of soil. This is probably related to the fact that the organic compounds measured by TPH in the produced water are partially in dissolved form, but dispersed particles are also transported by water flow, increasing the experimental values of $$D_h$$ D h .

中文翻译：

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有机化合物在原状土柱上的溶质分散

展示了对大型未受干扰样品进行的柱测试结果，重点是流体动力分散系数 ($D_h$$D h ) 的行为。使用来自陆上设施的石油产出水渗透不同细粒含量的沙土进行测试。为了测量采出水的有机含量，这项工作使用了参数 TPH（总石油烃）。所得结果表明，纵向弥散系数 ($$\alpha_L$$ α L ) 随流速 ( $$v_s$$ vs ) 而变化，流体动力弥散系数和扩散系数之间的比值 ( $$D_h/D $$ D h / D ) 和 $$\alpha _L$$ α L 比文献中通常发现的相同类型土壤的值高大约两个数量级。