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The governing equations are solved numerically using a Galerkin type linear finite element method applied to a network of triangular elements. Integration in time is achieved using an implicit (backwards) finite difference scheme for both saturated and unsaturated conditions.
As an alternative, we also incorporated the hysteresis model of Lenhard et al. [1991] and Lenhard and Parker [1992], which eliminates pumping by keeping track of historical reversal points, into HYDRUS. HYDRUS also implements a scaling procedure to approximate hydraulic variability in a given soil profile by means of a set of linear scaling transformations that relate the individual soil hydraulic characteristics to those of a reference soil.
HYDRUS是一个运行于Windows系统下的环境模拟软件,主要用于变量饱和多孔介质的水流和溶质运移。HYDRUS包括用于模拟变量饱和多孔介质下的水、热和多溶质运移的二维和三维有限元计算,包括一个参数优化算法,用于土壤的水压和溶质运移参数的逆向估计。该模型互动的图形界面,可进行数据前处理、结构化和非结构化的有限元网格生成以及结果的图形展示。 HYDRUS一共五个版本,用户可以选择适合自己版本。
Flow and transport can occur in the vertical plane, the horizontal plane, a three-dimensional region exhibiting radial symmetry about a vertical axis, or in a three-dimensional region.
The water flow part of the model can deal with (constant or time-varying) prescribed head and flux boundaries, as well as boundaries controlled by atmospheric conditions. Soil surface boundary conditions may change during the simulation from prescribed flux to prescribed head type conditions (and vice versa).
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