Boussinesq equation-based model for flow in drainage layer of highway
Boussinesq equation-based model for flow in drainage layer of highway
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DOI：
10.1007/s11771-012-1283-z
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发表时间：
2012-08
影响因子：
4.4
通讯作者：
H. Dan;Su-ping Luo;Liang Li;Lian-heng Zhao
中科院分区：
文献类型：
--
作者：
H. Dan;Su-ping Luo;Liang Li;Lian-heng Zhao
In order to study the water flow in the drainage layer of highway under steady-state condition, one-dimensional (1D) Boussinesq equation-based model with Dupuit-Forchheimer assumption was established and the semi-analytical solutions to predict the water-table height were presented. In order to validate the model, a two-dimensional (2D) saturated flow model based on the Laplace equation was applied for the purpose of the model comparison. The water-table elevations predicted by 1D Boussinesq equation-based model and 2D Laplace equation-based model match each other well, which indicates that the horizontal flow in drainage layer is dominated. Also, it validates the 1D Boussinesq equation-based model which can be applied to predict the water-table elevation in drainage layer. Further, the analysis was conducted to examine the effect of infiltration rate, hydraulic conductivity and slope of drainage layer on the water-table elevation. The results show that water-table falls down as the ratio ofIstoKdecreases and the slope increases. If the aquifer becomes confined by the top of drainage layer due to the larger ratio ofIstoKor smaller slope, the solution presented in this work can also be applied to approximate the water-table elevation in unconfined sub-section as well as hydraulic head in the confined sub-section.
