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The HYDRUS software has been developed by leading (award winning) scientists in the field of vadose zone hydrology (Rien Genuchten and Jirka Simunek). Note that both of them are Fellows of AGU (American Geophysical Union), AAAS (American Association for Advancement of Science, SSSA (Soil Science Society of America) and ASA (American Society of Agronomy), which are the highest awards given by these respective societies. Both these scientists are one of the most widely cited researchers in their field of science, having an h-index of 66 and 56 (in 2018), respectively, and tens of thousands of citations (both according to Web of Knowledge). Always at the cutting edge of the most recent developments in vadose zone hydrology.

This web site offers many other tools that may be helpful especially for beginning HYDRUS users. We continue to provide the Frequently Asked Questions (FAQ) and Discussion Forums where users can obtain answers to most of the more common questions as well as be able to share their experience, pose questions, and seek guidance for specific applications. We will continue to actively support these tools. You can also view simple demos (for Version 1 and Version 2) that illustrate the use of the new HYDRUS software, accompanied with brief explanations of particular commands and actions. Additionally, we provide a list of references so that potential HYDRUS users can see additional examples, in which HYDRUS has been applied in the past, and existing users can find help with their own applications.

Version 2.0, released in early May of 2011, is the first major upgrade of HYDRUS since 2006. In this version, we are expanding the four editions (Levels) which were available in version 1.x of HYDRUS, namely 2D-Lite, 2D-Standard, 3D-Lite, and 3D-Standard, with a new additional Level 3D-Professional. The 3D-Professinal Level will enable you to define transport domains of virtually arbitrary 3D shapes. Another major improvement that should significantly improve the effectiveness of working with HYDRUS is an option to specify various domain properties, and initial and boundary conditions, on Geometric Objects, rather than on FE-Mesh. We have also implemented two new solute transport modules (UNSATCHEM and Wetland) for evaluating the transport of major ions and for simulating processes in natural or constructed wetlands. There are also many other additional improvements and expansions of the model. Version 2.02, released in September 2012, offers three additional add-on modules: DualPerm for simulating two-dimensional variably-saturated water movement and solute transport in dual-permeability porous media, i.e., preferential and nonequilibrium water flow and solute transport, C-Ride for simulating two-dimensional colloid-facilitated solute transport, and HP2, which couples Hydrus (its two-dimensional part) with the PHREEQC geochemical code [Parkhurst and Appelo, 1999] to create this new comprehensive simulation tool (HP2 - acronym for HYDRUS-PHREEQC-2D), corresponding to a similar one-dimensional module HP1. Version 2.03, released in September 2013, uses new fonts improving the look of HYDRUS GUI on Chinese, Japanese and other similar Windows systems. This version also brings a number of new functions.

附加模块
UNSATCHem模块主要是用来模拟运移和主要离子的反应。UNSATCHEM模块模拟变饱和多孔介质中主要离子的运移(如钙、镁、钠、钾、SO4、碳酸气和Cl),包括主要离子平衡和非平衡化学反应动力学。生成的代码可用于预测土壤在瞬变流动中的主要离子化学、水和溶质通量。
Wetlands模块是用来模拟人工湿地反应的。人工湿地水处理系统的设计能优化自然环境中发现的处理过程。HYDRUS湿地模块包括两个biokinetic模型公式。而在原始湿地CW2D模块中,考虑到了**物、氮和磷需氧和缺氧的转换和降解过程,以及对新的CWM1模块中需氧、缺氧和厌氧过程的**物,氮和硫的考虑。
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