HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Abstract Full Text Free Full Text (PDF) Free Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in ISI Web of Science Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via ISI Web of Science (4) Citing Articles via Google Scholar Google Scholar Articles by Wang, Z. Articles by Kim, D.-J. Search for Related Content PubMed Articles by Wang, Z. Articles by Kim, D.-J. GeoRef GeoRef Citation Agricola Articles by Wang, Z. Articles by Kim, D.-J. Related Collections Uncertainty Analysis Unstable Flow/Fingering

Unstable Flow during Redistribution

Controlling Factors and Practical Implications

^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

View larger version (16K): [in a new window]   Fig. 1. Types of possible redistribution profiles after ponded infiltration.

View larger version (23K): [in a new window]   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).

View larger version (19K): [in a new window]   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).

View larger version (28K): [in a new window]   Fig. 4. Evolution of a perturbation at the wetting front during (a) ponded infiltration and (b) redistribution. The arrows show the flow directions.

View larger version (22K): [in a new window]   Fig. 5. Drying retention curves of the experimental materials.

View larger version (88K): [in a new window]   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.

View larger version (122K): [in a new window]   Fig. 7. Redistribution of fluids in the coarse sand: (a) deaired water ( = 0.993) added instantaneously; (b) through (d) salty water with anionic red dye ( = 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.

View larger version (95K): [in a new window]   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.