| 土壤水分运动空间变异性尺度效应的染色示踪入渗试验研究 |
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| 引用本文： | 王康,张仁铎,王富庆,安田裕.土壤水分运动空间变异性尺度效应的染色示踪入渗试验研究[J].水科学进展,2007,18(2):158-163. |
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| 作者姓名： | 王康 张仁铎 王富庆 安田裕 |
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| 作者单位： | 1.武汉大学水利水电学院, 水资源与水电工程科学国家重点实验室, 湖北, 武汉, 430072; |
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| 摘 要： | 探讨了土壤水非均匀流动特性和描述方法,通过染色示踪剂调查了三种试验尺度条件下非均匀流动模式,并采用随机层叠模型对不同实验尺度条件下非均匀流动模式进行了模拟。随机层叠模型中具有对数正态分布性质的随机层叠发生器被用来描述水流入渗过程,不同的方法被用于模型参数求解。试验观测和模拟计算结果均表明,尺度特性是非均匀流动的重要影响因素之一,准确的描述不同研究尺度下的非均匀流动特征,须同时考虑流动在水平和垂直方向的变异性。随着研究尺度的增加,流动的非均匀性变异程度更加明显。
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| 关 键 词： | 染色剂示踪 尺度效应 土壤水分运动 空间变异性 入渗试验 |
| 文章编号： | 1001-6791（2007）02-0158-06 |
| 收稿时间： | 2005-10-10 |
| 修稿时间： | 2006-01-06 |
Characterizing scale-dependent heterogeneity of soil water movement through dying infiltration experiments |
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| WANG Kang,ZHANG Ren-duo,WANG Fu-qing,YASUDA Hiroshi.Characterizing scale-dependent heterogeneity of soil water movement through dying infiltration experiments[J].Advances in Water Science,2007,18(2):158-163. |
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| Authors: | WANG Kang ZHANG Ren-duo WANG Fu-qing YASUDA Hiroshi |
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| Affiliation: | 1.State Key Lab.of Water Resource and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China;2.School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou 510275, China;3.Arid Land Research Center, Tottori University, Hamasaka 1390, Tottori, Japan |
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| Abstract: | To address the flow heterogeneity issue, the objective of this study are to investigate heterogeneity of soil water flow at different measurement scales using dying infiltration experiments and characterize the heterogeneity information included in different scales with the random cascade model. The random cascade model with a lognormal distribution is used to simulate the infiltration process in soils, and the different methods are applied to estimate the model parameters. Results based on the experimental data and the model simulations show that the measurement scale is important factors affecting the flow patterns in soils. To accurately describe flow transport processes at different scales, it is necessary to consider heterogeneities in the vertical and horizontal directions. As the measurement scale increases, the effect of multi-dimensional heterogeneities on the flow processes in soils becomes more significant. |
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| Keywords: | dying infiltration scale-dependent soil water movement heterogeneity infiltration experiment |
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