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.