摘要
本文利用有限元法建立了一维土壤水运动数值模型。提出了适应降雨/灌溉、蒸发等复杂的上边界条件的处理方法,可以用来统一计算土壤剖面降雨/灌溉入渗、地表积水、地表产流、蒸发、蒸腾以及当这些现象交替出现时的水分运动过程。在数值计算过程中,采用了质量守恒和特殊的迭代求解格式以加快计算收敛速度和减少水量平衡误差。模拟验证表明:本文模型提出的思路可行,计算方法合理并具有通用性。
The model for numerical simulating 1-D vertical flow in soil based on FEM is presented. The approach for dealing with the upper surface boundary conditions to adapt the complicated situation such as infiltration of precipitation or irrigation, surface ponding, runoff formation, evaporation and evaportanspiration as well as the ahemative occurrence of these situations are proposed. In the process of computation a method based on mass conservation and a special iteration procedure are applied to accelerate the convergence speed and minimize the error of water balance. The validity and feasibility of this simulation method are verified by an example.
出处
《水利学报》
EI
CSCD
北大核心
2007年第2期136-142,共7页
Journal of Hydraulic Engineering
基金
科技部西部开发重大项目(2004BA901A17)
关键词
土壤水运动
数值模拟
有限元法
上边界条件
质量守恒
movement of soil water
numerical simulation
FEM
upper surface boundary condition
mass conservation
