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首页> 外文期刊>Journal of Hydrology >Numerical demonstration of surfactant concentration-dependent capillarity and viscosity effects on infiltration from a constant flux line source
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Numerical demonstration of surfactant concentration-dependent capillarity and viscosity effects on infiltration from a constant flux line source

机译:表面活性剂浓度依赖性毛细作用和粘度对恒定通量线源入渗影响的数值模拟

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摘要

Surface infiltration line sources can deliver surfactant solutions for agricultural purposes or for use in subsurface remediation. Though the prediction of water distribution below a line source has received considerable attention in the scientific literature, little has been has been reported on how infiltration of surfactant solution from a line source differs from water infiltration. Few numerical models are capable of simulating surfactant-induced changes in moisture characteristic and hydraulic conductivity properties of unsaturated soil, so it is difficult to assess the importance of these effects when designing surfactant application schemes. We investigated surfactant infiltration behavior by using the variably-saturated flow and transport model HYDRUS-2D [Simunek, J., Sejna, M., van Genuchten, M.Th., 1999. The HYDRUS-2D software package for simulating the two-dimensional movement of water, heat, and multiple solutes in variably-saturated media, Version 2.0. IGWMC-TPS-53C. International Ground Water Modeling Center, Colorado School of Mines, Golden, CO] which was modified by [Henry, E.J., Smith, J.E., Warrick, A.W., 2002. Two-dimensional modeling of flow and transport in the vadose zone with surfactant-induced flow. Water Resour. Res. 38. DOI: doi:10.1029/ 2001WR000674] to incorporate surfactant effects on unsaturated flow. Significant differences were found between pure water and surfactant solution infiltration into a fine sand that was initially at residual moisture content. The surfactant solution wetted a larger area, both horizontally and vertically, relative to water, while the distribution of water within the wetted zone was more uniform than in the surfactant system. The surfactant system exhibited transient localized drainage and rewetting caused by surfactant-induced capillary pressure gradients within the wetting front. A standard unsaturated flow model (i.e., one that does not include surfactant effects on flow) is not capable of capturing the transient flow behavior. However, our results show that by using an effective scaled media (ESM) approach a standard model can be used to simulate later-time hydraulic conditions in a surfactant system. (c) 2006 Elsevier B.V. All rights reserved.
机译:地表渗透线源可以提供用于农业目的或用于地下修复的表面活性剂溶液。尽管在科学文献中对线源下方水分布的预测已引起了相当大的关注,但关于线源中表面活性剂溶液的渗透与水渗透有何不同的报道很少。很少有数值模型能够模拟表面活性剂引起的非饱和土壤水分特征和水力传导特性的变化,因此在设计表面活性剂施用方案时很难评估这些影响的重要性。我们通过使用可变饱和的流动和传输模型HYDRUS-2D [Simunek,J.,Sejna,M.,van Genuchten,M.Th.,1999. HYDRUS-2D软件包来模拟两个版本2.0中的水,热量和多种溶质在可变饱和介质中的三维运动。 IGWMC-TPS-53C。科罗拉多州矿业学院国际地下水建模中心,科罗拉多州,金矿,由[Henry,EJ,Smith,JE,Warrick,AW,2002修改。]由表面活性剂诱导的渗流区流动和运移的二维建模流。水资源。 Res。 38.DOI:doi:10.1029 / 2001WR000674]以结合表面活性剂对不饱和流动的影响。发现纯水和表面活性剂溶液渗透到细砂中时存在显着差异,该细砂最初是残留水分。表面活性剂溶液相对于水在水平和垂直方向上都润湿较大的区域,而润湿区域内的水分布比在表面活性剂体系中更均匀。表面活性剂系统表现出暂时的局部排水和再润湿,这是由表面活性剂在润湿锋面内引起的毛细管压力梯度引起的。标准的不饱和流动模型(即不包括表面活性剂对流动的影响的模型)不能捕获瞬态流动行为。但是,我们的结果表明,通过使用有效的定标介质(ESM)方法,可以使用标准模型来模拟表面活性剂系统中的后期液压条件。 (c)2006 Elsevier B.V.保留所有权利。

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