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Right arrow Uncertainty Analysis
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Unstable Flow during Redistribution

Controlling Factors and Practical Implications

Zhi Wang*,a, William A. Juryb, Atac Tulib and Dong-Ju Kimc

a Dep. of Earth and Environmental Sciences, California State University, Fresno, CA 93740
b Dep. of Environmental Sciences, University of California, Riverside, CA 92521
c Dep. of Earth & Environmental Science, Korea University, Seoul, Republic of Korea



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Fig. 1. Types of possible redistribution profiles after ponded infiltration.

 


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Fig. 2. Schematics of moisture and pressure redistribution with respect to the amount of initial application: (a) hysteresis effects, (b) L < S, (c) L > S, and (d) water blob at the front. The asterisked variable indicates the maximum water content of the profile during redistribution (Peck, 1971).

 


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Fig. 3. Schematic matric potential profiles, h = h(z, t), at the end of infiltration (t = 0) and at different times t during redistribution: (a) L < S and (b) L > S. The asterisked variables indicate the positions of the maximum water content at the time (Peck, 1971).

 


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Fig. 4. Evolution of a perturbation at the wetting front during (a) ponded infiltration and (b) redistribution. The arrows show the flow directions.

 


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Fig. 5. Drying retention curves of the experimental materials.

 


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Fig. 6. Redistribution of unevenly applied water in a finer sand (top 22 cm) and a coarser sand (below) through a line source. I is the depth of water applied into the sands, and t is the time of redistribution.

 


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Fig. 7. Redistribution of fluids in the coarse sand: (a) deaired water ({rho} = 0.993) added instantaneously; (b) through (d) salty water with anionic red dye ({rho} = 1.06) and deaired water through an irrigation dropper (1 drop s–1 or 6.6 mL min–1). I is the depth of water applied into the sands, and t is the time of redistribution.

 


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Fig. 8. Redistribution profiles of water in the wet coarse sand with repeated irrigation cycles. The top 10 cm of sand was air-dry. I is the depth of water applied into the sands, and t is the time of redistribution.

 





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