浅层地下水环境中成层土变比屈服的解析表达式
Analytical expressions of variable specific yield for layered soils in shallow water table environments
摘要：
本文提出了浅层地下水环境中层状土的可变单位产量的解析表达式，并引入了点单位产量（Syp）和区间平均单位产量（Syi）两个不同的概念。Syp和Syi分别是指地下水位波动无限趋近于零时的单位产量和地下水位区间波动时的单位产量。基于比产率定义和土壤持水模型，分别提出了层状土壤Syp和Syi的解析和半解析表达式。通过实验数据和与已有的解析表达式的比较，对解析表达式进行了评价和验证。分析表明，本文的Syp和Syi表达式能有效地反映浅层地下水位条件下土壤水力特性和土壤分层的变化和非线性特性。以前混淆的理解Syp和Syi也区分。针对地下水模拟和管理问题的潜在应用，全面分析了特定产量表达式的实用性和适用性。
英文摘要：
This paper presents analytical expressions of variable specific yield for layered soils in shallow water table environments, with introducing two distinct concepts of point specific yield (Syp) and interval average specific yield (Syi). The Syp and Syi refer to the specific yield for the water table fluctuation approaching zero infinitely and that for an interval fluctuation of water table, respectively. On the basis of specific yield definition and van Genuchten model of soil water retention, the analytical and semi-analytical expressions were respectively proposed for Syp and Syi towards layered soils. The analytical expressions are evaluated and verified by experimental data and comparison with the previous expressions. Analyses indicate our expressions for Syp and Syi could effectively reflect the changes and nonlinear properties affected by soil hydraulic properties and soil layering under shallow water table conditions. The previously confused understanding of Syp and Syi are also distinguished. The practicality and applicability for the specific yield expressions are comprehensively analyzed for the potential applications related to the subsurface water modeling and management issues.
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