Improved Boussinesq Equation–Based Model for Transient Flow in a Drainage Layer of Highway: Capillary Correction
Improved Boussinesq Equation–Based Model for Transient Flow in a Drainage Layer of Highway: Capillary Correction
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DOI：
10.1061/(asce)ir.1943-4774.0000642
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发表时间：
2013-05
期刊：
影响因子：
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通讯作者：
H. Dan;P. Xin;Ling Li;Liangchao Li
中科院分区：
文献类型：
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作者：
H. Dan;P. Xin;Ling Li;Liangchao Li
摘要 目前，排水时间和水流深度是公路排水层设计的两个基本概念，两者都是基于饱和水流，无法合理评价排水层的排水效率。最近的一项研究表明，在某些情况下，不饱和流动在将水排出排水层方面发挥着重要作用，毛细管效应可能会变得显着。鉴于两种方法的缺点，将它们结合起来指导排水层的设计是合理的。这里，基于带有毛细管校正的一维 (1D) 瞬态 Boussinesq 方程建立了模型。采用分离变量法得到了控制方程的通解。此外，所提出的模型还针对有限差分法（MATLAB 程序）和有限元法（SUTRA 程序）预测的数值模拟进行了验证。进行了比较以证明差异...
AbstractCurrently, time to drain and depth of flow are the two basic concepts for designing the drainage layer of highway, both of which are based on the saturated flow and cannot reasonably evaluate the drainage efficiency of drainage layer. A recent study demonstrated that capillary effects could become significant with unsaturated flow playing an important role in conducting water out of the drainage layer in some cases. In view of the disadvantages of the two methods, it is reasonable to combine them to guide the design of a drainage layer. Here, a model was established based on the one-dimensional (1D) transient Boussinesq equation with a capillary correction. The general solution to the governing equation was obtained using the method of separation variables. Furthermore, the presented model was validated against numerical simulations predicted by a finite-difference method (the MATLAB program) and the finite-element method (SUTRA program). A comparison was conducted to demonstrate the difference be...