342-8 Special Boundary Conditions In HYDRUS (2D/3D) for Irrigation Systems.



Wednesday, October 19, 2011: 10:15 AM
Henry Gonzalez Convention Center, Room 007C, River Level

Jirka Simunek, Geology #2320, University of California-Riverside, Riverside, CA, Miroslav Sejna, PC Progress, Inc., Prague, Czech Republic, Maziar Kandelous, Land, Air, and Water, University of California Davis, Davis, CA, Naftali Lazarovitch, Ben-Gurion Univ of the Negev, Ben-Gurion University of the Negev, Sede Boqer Campus, ISRAEL and Martinus van Genuchten, Department of Mechanical Engineering, Federal University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil
We have implemented into HYDRUS (2D/3D) several specialized boundary conditions that allow modeling of various system-dependent irrigation systems. These include a) a dynamic evaluation of the wetted area for surface drip irrigation (evaluates the spatial distribution of the discharge rate at the soil surface as a function of time), b) a subsurface drip characteristic function to account for back pressures (evaluates the source discharge while considering emitter properties, inlet pressure, and effects of the soil hydraulic properties), c) system-triggered irrigation, among other features. Irrigation can be triggered by the program when the pressure head at a particular observation node drops below a specified value. Irrigation is then initiated at a specified rate and duration, after a specified lag time, at a selected boundary. These, and other, system-dependent boundary conditions have been implemented into version 2 of the Professional Level of HYDRUS (2D/3D). Many other new features and options [e.g., support for complex general three-dimensional geometries; properties specified on geo-objects rather than a FE Mesh; import of properties and geometries from various formats; new wetlands, fumigant, and Unsatchem modules; compensated root water and nutrient (passive and active) uptake, and many others] have been implemented also.
See more from this Division: S01 Soil Physics
See more from this Session: Linked Non-Linear Processes at the Soil/Plant/Atmosphere Continuum