| 非饱和流节点间导水率估计及达西平均分析 |
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| 引用本文： | 裴元生,王金生,田朝晖,崔鹏.非饱和流节点间导水率估计及达西平均分析[J].水科学进展,2006,17(2):216-221. |
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| 作者姓名： | 裴元生 王金生 田朝晖 崔鹏 |
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| 作者单位： | 1.北京师范大学环境学院, 北京, 100875; |
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| 基金项目： | 国家科技攻关项目;博士后科学基金 |
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| 摘 要： | 针对由Gardner-Russo函数描述的特征土壤,在双饱和度坐标系中,探讨了常规节点间导水率估计与量纲一水平达西平均(k*H)和量纲一垂直达西平均(k*V)的差异.k*H是相邻两节点饱和度的函数,而k*V也是空间步长(Δx)和特征参数(α)的函数.对水平非饱和流,算术平均高估导水率,而几何与调和平均低估导水率;从相对误差空间分布看,几何平均优于算术和调和平均.对垂直非饱和流,随Δx(或α)的增大,常规估计的相对误差空间顺(或逆)时针旋转并缩小,从而降低模型准确性.k*H等值线具有对称性,而k*V不具对称性;仅当Δx或α足够小时,k*H才趋近于k*V.因此,为提高非饱和流数值模拟的准确性,必须采用精确的达西平均来计算节点间导水率.
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| 关 键 词： | 非饱和流 节点间导水率 达西定律 达西平均 饱和度 |
| 文章编号： | 1001-6791（2006）02-0216-06 |
| 收稿时间： | 2004-10-29 |
| 修稿时间： | 2005-03-10 |
Estimations of interblock conductivity and darcian means in unsaturated flow |
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| PEI Yuan-sheng,WANG Jin-sheng,TIAN Zhao-hui,CUI Peng.Estimations of interblock conductivity and darcian means in unsaturated flow[J].Advances in Water Science,2006,17(2):216-221. |
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| Authors: | PEI Yuan-sheng WANG Jin-sheng TIAN Zhao-hui CUI Peng |
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| Institution: | 1.School of Environment, Beijing Normal University, Beijing 100875, China;2.Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China |
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| Abstract: | For the soils described by the Gardner-Russo retention function,the differences between standard estimations of interblock conductivity and the dimensionless horizontal Darcian means(k*H are symmetrical but those of k*H approaches k*V only when both △x and are small enough Therefore,it is rather essential to adopt Darcian means instead of the standard estimation of the unsaturated flow simulation. |
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| Keywords: | unsaturated flow interblock conductivity Darcy's Law Darcian means saturation |
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