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Focus Topic: Vadose Zone Models

Vadose Zone Journal has, since its inception, been an outlet for manuscripts in which numerical models have been used to support research on many different topics. This focus topic features recent articles in which numerical models are used in support of research in various hydrological, environmental, and ecological studies.
Review: Recent Developments and Applications of the HYDRUS Computer Software Packages
Jiří Šimůnek, Martinus Th. van Genuchten, and Miroslav Šejna
Review: Modeling Soil Processes: Review, Key Challenges, and New Perspectives
H. Vereecken, A. Schnepf, J.W. Hopmans, M. Javaux, D. Or, T. Roose, J. Vanderborght, M.H. Young et al.
Aaron Potkay
This study presents a new nonlinear partial differential equation to describe the dissipation of suction within unsaturated, swelling soils by vertical moisture flow using a material coordinate and so...more
Mehmet Evren Soylu, Steven P. Loheide and Christopher J. Kucharik
We investigated the potential impacts of shallow groundwater, root length density (RLD) distribution, and root water compensation on transpiration and net primary productivity (NPP). An agroecosystem...more
Jing Liang, Scott A. Bradford, Jiří Šimůnek and Anne Hartmann
Surface runoff is commonly described in numerical models using either the diffusion wave or kinematic wave equations, which assume that surface runoff occurs as sheet flow with a uniform depth and vel...more
Thomas Maurer and Horst H. Gerke
The development pathway of a landscape depends to a degree on the initial spatial distributions of mineral and organic components. The interaction between structures and ecohydrological processes duri...more
S. Baram, V. Couvreur, T. Harter, M. Read, P.H. Brown, M. Kandelous, D.R. Smart and J.W. Hopmans
Large spatial and temporal variability in water flow and N transport dynamics poses significant challenges to accurately estimating N losses form orchards. A 2-yr study was conducted to explore nitrat...more
Jannis Groh, Jan Vanderborght, Thomas Pütz and Harry Vereecken
A dynamic tension-controlled bottom boundary of lysimeters allows observing water and matter fluxes in lysimeters that are close to natural field conditions, as pressure heads at the lysimeter bottom...more
Jiří Šimůnek, Martinus Th. van Genuchten and Miroslav Šejna
The HYDRUS-1D and HYDRUS (2D/3D) computer software packages are widely used finite-element models for simulating the one- and two- or three-dimensional movement of water, heat, and multiple solutes in...more
Clemens J.M. Cremer, Insa Neuweiler, Michel Bechtold and Jan Vanderborght
We investigate the effect of dynamic boundary conditions on solute transport in unsaturated, heterogeneous, bimodal porous media. Solute transport is studied with two-dimensional numerical flow and tr...more
H. Vereecken, A. Schnepf, J.W. Hopmans, M. Javaux, D. Or, T. Roose, J. Vanderborght, M.H. Young, W. Amelung, M. Aitkenhead, S.D. Allison, S. Assouline, P. Baveye, M. Berli, N. Brüggemann, P. Finke, M. Flury, T. Gaiser, G. Govers, T. Ghezzehei, P. Hallett, H.J. Hendricks Franssen, J. Heppell, R. Horn, J.A. Huisman, D. Jacques, F. Jonard, S. Kollet, F. Lafolie, K. Lamorski, D. Leitner, A. McBratney, B. Minasny, C. Montzka, W. Nowak, Y. Pachepsky, J. Padarian, N. Romano, K. Roth, Y. Rothfuss, E.C. Rowe, A. Schwen, J. Šimůnek, A. Tiktak, J. Van Dam, S.E.A.T.M. van der Zee, H.J. Vogel, J.A. Vrugt, T. Wöhling and I.M. Young
The remarkable complexity of soil and its importance to a wide range of ecosystem services presents major challenges to the modeling of soil processes. Although major progress in soil models has occur...more
Zhao Liu, Yuanyuan Zha, Wenyuan Yang, Yi-Ming Kuo and Jinzhong Yang
Based on the stochastic perturbation approach, a large-scale unsaturated flow model was derived in which the saturated hydraulic conductivity (Ks) is assumed to be a random field. The corresponding ef...more