Numerical analysis of one-dimensional unsaturated flow in layered soils

被引:122
作者
Romano, N [1 ]
Brunone, B
Santini, A
机构
[1] Univ Naples Federico II, Inst Agr Hydraul, I-80055 Naples, Italy
[2] Univ Perugia, Interfac Inst Hydraul, I-06125 Perugia, Italy
关键词
one-dimensional unsaturated flow; Richards equation; hydraulic conductivity;
D O I
10.1016/S0309-1708(96)00059-0
中图分类号
TV21 [水资源调查与水利规划];
学科分类号
081501 ;
摘要
The paper deals with numerical solutions to the Richards equation to simulate one-dimensional how processes in the unsaturated zone of layered soil profiles. The equation is expressed in the pressure-based form and a finite-difference algorithm is developed for accurately estimating the values of the hydraulic conductivity between two neighboring nodes positioned in different soil layers, often referred to as the interlayer hydraulic conductivity. The algorithm is based upon flux conservation and continuity of pressure potential at the interface between two consecutive layers, and does not add significantly to simulation run time. The validity of the model is established for a number of test problems by comparing numerical results with the analytical solutions developed by Srivastava and Yeh(29) which hold for vertical infiltration towards the water table in a two-layer soil profile. The results show a significant reduction in relative mass balance errors when using the proposed model. Some specific insights into its numerical performance are also gained by comparisons with a numerical model in which the more common geometric averaging operator acts on the interlayer conductivities. (C) 1996 Elsevier Science Limited. All rights reserved.
引用
收藏
页码:315 / 324
页数:10
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