中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
非饱和流节点间导水率估计及达西平均分析

文献类型:期刊论文

作者崔鹏
刊名水科学进展
出版日期2006
卷号17期号:2页码:216-221
关键词非饱和流 节点间导水率 达西定律 达西平均 饱和度
其他题名Estimations of interblock conductivity and darcian means in unsaturated flow
通讯作者崔鹏
合作状况国内
中文摘要针对由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(kV*)的差异。k*H是相邻两节点饱和度的函数,而kV*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kV*不具对称性;仅当Δx或α足够小时,k*H才趋近于kV*。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。
英文摘要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) and the vertical Darcian means(k~*_V) are investigated within the double-saturation coordinate system.While k~*_H only varies with the conductivities at two adjacent nodes,k~*_V is the function of the space step(Δx) and the absorbed number(α).For the horizontal unsaturated flow the arithmetic means shows the overestimation of the interblock conductivity while the geometric means and the harmonic means give underestimations.If we observe the distribution of relative-error spaces,the geometric means is better than the others.For the vertical flow the relative error spaces from the standard estimations rotate clockwise and counter-clockwise with the increase of Δx and α,respectively.The reduced space may decrease the precise of the numerical simulation.The contour lines of k~*_H are symmetrical but those of k~*_V are not.k~*_H approaches k~*_V only when both Δx and α are small enough.Therefore,it is rather essential to adopt Darcian means instead of the standard estimation of the unsaturated flow simulation.
分类号P641.2
资助信息国家高技术研究发展计划(863)项目(2003AA601060);;博士后科学资助基金
语种中文
公开日期2011-06-17
源URL[http://ir.imde.ac.cn/handle/131551/3250]  
专题成都山地灾害与环境研究所_成都山地所知识仓储(2009年以前)
成都山地灾害与环境研究所_山地灾害与地表过程重点实验室
推荐引用方式
GB/T 7714
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.
APA 崔鹏.(2006).非饱和流节点间导水率估计及达西平均分析.水科学进展,17(2),216-221.
MLA 崔鹏."非饱和流节点间导水率估计及达西平均分析".水科学进展 17.2(2006):216-221.

入库方式: OAI收割

来源:成都山地灾害与环境研究所

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