Furrow Module Parameters

The Furrow Parameters dialog window is shown below.

In this dialog window, users specify all additional parameters (in addition to standard HYDRUS parameters) required by the Furrow Module that are needed to fully define the geometry and parameters of the furrow, the furrow spatial and temporal discretizations, as well as the boundary conditions defining irrigation and fertigation.

Main Input

bw        Bottom width of the furrow [L]

SS        Slope of the furrow sides [-] defined as tan(α) where α is the angle of the slope side.

hmax        Depth of the furrow [L]

L        Length of the furrow [L]

Mn        Manning's roughness coefficient [TL-1/3]

Cinj        Solute concentration in the irrigation water [ML3]

Spatial and Temporal Discretization

N        Number of Stations, i.e., locations along the furrow with 2D cross-sectional profiles [-].

dt        Time interval at which information is exchanged between the Open Channel and Subsurface modules [T]

Outflow Boundary Type

Open End        The end of the furrow is open, allowing water to flow over a bring at the end of the furrow

Blocked End        The end of the furrow is blocked, i.e., no outflow is allowed until the water level reaches the maximum furrow depth hmax

Time Variable Boundary Conditions

Number of Records        Number of time intervals with different boundary conditions (when water of solute inflow changes)

Time        Time when the boundary condition changes [T]

Qir        Irrigation rate [L3T-1]

Qinj        Fertigation rate [L3T-1]

Spatial Coordinates of Cross-Section Profiles/Stations

x        Distance of the Cross-Section Profile/Station from the beginning of the furrow

z        Height of the Cross-Section Profile/Station relative to the end of the furrow

Brunetti, G., J. Šimůnek, and E. Bautista, A hybrid finite volume-finite element model for the numerical analysis of furrow irrigation and fertigation, Computers and Electronics in Agriculture, 150, 312-327, doi: 10.1016/j.compag.2018.05.013, 2018.