Advantages and Disadvantages of Irrigation ... - Riversymposium

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Water-Table Spreading H H 1e+0 1e-1 1e-2 1e-3 1e-4 1e-5 1e-6 1e-7 1e-8 1e-9 1e-10 10 1 0.1 0.01 0.001 0.0001 • For single patches the area affect by water- table spreading increases as R increases. • For an array of patches the impact is increased due to overlap of the water-tables • Spacing of patches is important Single Patch Array of Patches ρ 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 τ = 1x10 -8 τ = 1x10 -5 τ = 1x10 -2 0 10 20 30 40 50 60 ρ τ = 10 τ = 50 τ = 100 a c ρ 0 2 4 6 8 10 12 τ = 0.1 τ = 1 τ = 5 0 100 200 300 400 500 600 ρ τ = 500 τ = 1000 τ = 5000 τ = 10000 CSIRO. Advantages and Disadvantages of Irrigation Mosaics as an Alternative to Traditional forms of Irrigation in Northern Australia b d H(τ,ρ) H(τ,ρ) 0.12 0.10 0.08 0.06 0.04 0.02 0.00 1e+3 1e+2 1e+1 1e+0 1e-1 1e-2 1e-3 1e-4 1e-5 ρ 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 L = infinity L = 2 L = 2.2 L = 2.5 L = 5 a ρ 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 1.0 b ρ L = infinity L = 2 L = 2.5 L = 3 L = 5 0.01 0.1 1 10 100 10000.001 0.01 0.1 1 10 100 1000 ρ L = infinity L = 2 L = 2.5 L = 5 L = 10 L = 20 c L = infinity L = 2 L = 5 L = 10 L = 20 L = 50 d 0.8 0.6 0.4 0.2 0.0 1e+3 1e+2 1e+1 1e+0 1e-1 1e-2 1e-3 1e-4 H(τ,ρ) H(τ,ρ)
Solute Spreading • For single patches • Δr = Rs – R, Rs = radius of solute spread • Solutes spread further under large patches • With correct spacing irrigation mosaics could reduce ‘pollution’ of areas outside of the irrigated region 1e+5 1e+4 Δr (m) 1e+3 S1 Regression S1 S2 Regression S2 1e+2 1e+1 1e+2 1e+3 1e+4 1e+5 R (m) CSIRO. Advantages and Disadvantages of Irrigation Mosaics as an Alternative to Traditional forms of Irrigation in Northern Australia
Page 1 and 2: Advantages and Disadvantages of Irr
Page 3 and 4: Why Irrigation Mosaics Rainfall Sur
Page 5 and 6: Bio-Physical Aspects • Investigat
Page 7: Water-Table Rise • Spacing of the
Page 11 and 12: Conclusions - Specifics • Irrigat
Page 13: CSIRO Land and Water Freeman Cook S

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