| 蒸发条件下土壤水分响应模拟 |
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| 引用本文： | 杨德军,ZHANG Ke-feng,张土乔.蒸发条件下土壤水分响应模拟[J].水科学进展,2011,22(2):208-214. |
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| 作者姓名： | 杨德军 ZHANG Ke-feng 张土乔 |
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| 作者单位： | 1.中国矿业大学环境与测绘学院, 江苏, 徐州, 221116; |
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| 基金项目： | 国家自然科学基金资助项目(51009134); 中国博士后科学基金资助项目(20100471414)~~ |
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| 摘 要： | 基于有限元(FEM)和改进的积分型Richards方程解法(IRE方法)对蒸发条件下5种土体土壤水分响应进行了研究.数值实验结果表明:在土壤表面潜在蒸发量0.50 cm/d的情况下,5种土体土壤含水率变化曲线均呈现单拐点两阶段的特点,拐点出现在地表下20cm左右,拐点上部区域曲线曲率大于下部区域,两阶段的划分以15d左右为界,前阶段比后阶段的土壤水分变化快;蒸发模拟结果很好的证明了蒸发三阶段理论.总蒸发量和下边界排水量与土壤结构密切相关,而总水量变化量和变化率与土壤质地有关.IRE方法与FEM模拟结果基本一致,解法相对简单,模拟结果可靠性高.
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| 关 键 词： | 有限元 积分型Richards方程解法 土壤含水率 蒸发 |
| 收稿时间： | 2010-05-28 |
Modeling soil moisture responses under evaporative conditions |
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| YANG De-jun,ZHANG Ke-feng,ZHANG Tu-qiao.Modeling soil moisture responses under evaporative conditions[J].Advances in Water Science,2011,22(2):208-214. |
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| Authors: | YANG De-jun ZHANG Ke-feng ZHANG Tu-qiao |
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| Institution: | 1.School of Environment Science and Spatial Informatics, China University of Mining and Technology, Xuzhou 221116, China;2.Warwick HRI, The University of Warwick, Wellesbourne, Warwick CV35 9EF, UK;3.School of Civil Engineering and Architecture, Hangzho |
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| Abstract: | Based on the finite element method(FEM) and the modified integrated Richards equation model(IRE),the responses of soil moisture under the evaporative condition for 5 different soil types were numerically studied in this paper.Numerical experiments were carried out on the 100-cm high soil columns subject to a constant potential evaporation of 0.5 cm/d and free drainage from near saturation.The results show that the variations in vertical distributions of soil moisture content for the 5 soil types exhibit a s... |
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| Keywords: | finite element method integrated Richards equation model soil water content evaporation |
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