| 多个相关随机参数的空间变异性对溶质运移的影响 |
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| 引用本文： | 施小清,吴吉春,吴剑锋,姜蓓蕾,徐红霞.多个相关随机参数的空间变异性对溶质运移的影响[J].水科学进展,2012,23(4):509-515. |
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| 作者姓名： | 施小清 吴吉春 吴剑锋 姜蓓蕾 徐红霞 |
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| 作者单位： | 1.南京大学地球科学与工程学院水科学系, 江苏南京 210093; |
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| 基金项目： | 国家重点基础研究发展计划(973)资助项目(2010CB428803);国家自然科学基金资助项目(41172206)~~ |
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| 摘 要： | 根据给定渗透系数、孔隙度以及吸附系数的概率分布,采用顺序高斯模拟生成相关的多参数随机场的实现,作为地下水流和溶质运移模型的输入参数,对污染物浓度进行随机分析。研究结果表明,与仅考虑渗透系数空间变异性相比,考虑相关的多参数空间变异性导致污染羽的扩散程度有显著不同。当孔隙度与渗透系数呈正相关关系时,会减少污染羽的扩散程度,反之,当孔隙度与渗透系数为负相关关系时,会加剧污染羽的扩散程度。吸附系数也是如此。在考虑吸附系数的空间变异性之后,污染羽的分布表现出拖尾现象。同时考虑渗透系数、孔隙度以及吸附系数空间变异性时,孔隙度非均质性对溶质运移的影响较吸附系数非均质性的影响更大。
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| 关 键 词： | 非均质 随机场 渗透系数 孔隙度 吸附系数 溶质运移 |
| 收稿时间： | 2011-05-17 |
Effects of the heterogeneity of multiple correlated random parameters on solute transport |
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| SHI Xiao-qing
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WU Ji-chun
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WU Jian-feng
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JIANG Bei-lei
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XU Hong-xia.Effects of the heterogeneity of multiple correlated random parameters on solute transport[J].Advances in Water Science,2012,23(4):509-515. |
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| Authors: | SHI Xiao-qing WU Ji-chun WU Jian-feng JIANG Bei-lei XU Hong-xia |
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| Affiliation: | 1.School of Earth Sciences and Engineering, Nanjing University, Nanjing 210093, China;2.National Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing 210029, China |
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| Abstract: | Based on the given probability distributions of hydraulic conductivity,porosity,and adsorption coefficient,a sequential Gaussian simulation method is used to generate multiple correlated stochastic parameter fields.The generated parameter values are used in groundwater flow and transport model simulations,and for the subsequent model uncertainty analysis.The results show that the consideration of the spatial variability of multiple correlated parameters in model simulations can result in a contamination plume spreading that is significantly different from that when only the spatial variability of hydraulic conductivity is considered.The contamination plume spreading is reduced when the porosity can be positively correlated to the hydraulic conductivity.On the contrary,the spreading is increased when the porosity can be negatively correlated to the hydraulic conductivity.The similar result is obtained for the adsorption coefficient.When the spatial variability of adsorption coefficient is further considered,the contamination plume spreading shows a long-tailed distribution.When taking into account the spatial variability of hydraulic conductivity,porosity,and adsorption coefficient,the effect of the heterogeneity of porosity on the contamination plume spreading will be greater than that of considering the adsorption coefficient. |
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| Keywords: | heterogeneity random field hydraulic conductivity porosity adsorption coefficient solute transport |
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