HYDRUS Projects  Drip
 Project Group: Drip
 Description: Examples involving subsurface drip irrigation; described in Hanson et al. (2006, 2008), Skaggs et al (2004), and Siyal et al. (2009).
 Availability: Download HYDRUS projects now (11.1 MB)
 Note: These projects were created with an earlier version of Hydrus, and users using higher Hydrus versions need to convert them to their particular version.
Project

Description

Sub2f1a

Subsurface drip irrigation for the B fertigation strategy (fertigation near beginning of irrigation). Solutes considered: ureaammoniumnitrate, potassium, phosphorus (Hanson et al., 2006).

Sub2f1c

Subsurface drip irrigation for the E fertigation strategy (fertigation near the end of irrigation). Solutes considered: ureaammoniumnitrate, potassium, phosphorus (Hanson et al., 2006).

Sub2f3

Subsurface drip irrigation for the M50 fertigation strategy (fertigation during the middle 50% of the irrigation event). Solutes considered: ureaammoniumnitrate, potassium, phosphorus (Hanson et al., 2006).

Sub1112

Subsurface drip irrigation, water table depth of 0.5 m, 0.3 dS/m, irrigation efficiency=0.9, 7 per week (Hanson et al., 2008).

Sub1212

Subsurface drip irrigation, water table depth of 0.5 m, 1.0 dS/m, irrigation efficiency =0.9, 7 per week (Hanson et al., 2008).

Sub2111

Subsurface drip irrigation, water table depth of 1.0 m, 0.3 dS/m, irrigation efficiency =0.9, 2 per week (Hanson et al., 2008).

Sub2211

Subsurface drip irrigation, water table depth of 1.0 m, 1.0 dS/m, irrigation efficiency =0.9, 2 per week (Hanson et al., 2008).

Skaggs

Trout/Parlier surface drip irrigation, 40 L/m application, Fig. 3 (Skaggs et al., 2004). Download HYDRUS project now (0.5 MB)

Pitcher

Evaluation of the performance of a pitcher irrigation system (Siyal et al., 2009). Download HYDRUS project now (2.3 MB)

References:
Hanson, B. R., J. Šimůnek, and J. W. Hopmans, Numerical modeling of ureaammoniumnitrate fertigation under microirrigation, Agric. Water Management, 86, 102113, 2006.
Hanson, B. R., J. Šimůnek, and J. W. Hopmans, Leaching with subsurface drip irrigation under saline, shallow ground water conditions, Vadose Zone Journal, doi:10.2136/VZJ2007.0053, Special Issue “Vadose Zone Modeling”, 7(2), 810818, 2008.
Skaggs, T. H., T. J. Trout, J. Šimůnek, and P. J. Shouse, Comparison of Hydrus2D simulations of drip irrigation with experimental observations, J. of Irrigation and Drainage Engineering, 130(4), 304310, 2004.
Siyal, A. A., M. Th. van Genuchten, and T. H. Skaggs, Performance of pitcher irrigation systems, Soil Science, 174(6), 312320, 2009.
FAQ: How to calculate the flux for a semicircle boundary representing the dripper?
 Example for a ThreeDimensional (2D axisymmetrical) Scenario with a single dripper:
Radius of a dripper: r=2 cm
Surface area of a dripper: S=4 PI r2=4*3.1415*2 cm2=50.264 cm2
Dripper discharge: Q = 1.0 L/h = 24,000 cm3/d
Boundary flux applied at the dripper: q = Q/S = 24,000 [cm3/d] / 50.264 [cm2] = 238.7 cm/d
 Example for a TwoDimensional Scenario (representing a drip tape; calculations based on drip tape discharge):
Radius of a dripper: r=1 cm
Circumference of a dripper: L=2 PI r=2*3.1415*1 cm=6.283 cm
Drip tape discharge: Q=1 L/m/h=24,000 cm3/m/d=240 cm3/cm/d [cm2/d]
Boundary flux applied at the dripper: q= Q/L =240 [cm2/d] / 6.283 [cm] = 38.2 cm/d
 Example for a TwoDimensional Scenario (representing a drip tape; calculations based on dripper discharge):
Radius of a dripper: r = 1 cm
Circumference of a dripper: L = 2 PI r=2*3.1415*1 cm = 6.283 cm
Distance between drippers on a drip line: d = 30 cm
Dripper discharge: Q = 1 L/h = 24,000 cm3/d
Drip tape discharge: Qt = Q/d = 1 L/h / 30 cm = 800 cm3/cm/d [cm2/d]
Boundary flux applied at the dripper: q = Q/L = 800 [cm2/d] / 6.283 [cm] = 127.3 cm/d
 Example from the Tutorial 1 (twodimensional, representing a drip tape):
Radius of a dripper: r=1 cm
Circumference of a dripper: L=2 PI r=2*3.1415*1 cm=6.283 cm
Boundary flux applied at the dripper: q= 60 cm/d
Drip tape discharge: Q=Lq= 6.283 cm*60.0 cm/d= 377 cm2/d [cm3/cm/d]=1.57 L/m/h