Comment on 'A physical model of particulate wash-off from rough impervious surfaces' by Shaw et al. [Journal of Hydrology 327 (2006) 618-626]

摘要

Shaw et al. (2006) presented data from experiments using a small flume (10.5 · 80 cm) with rain-impacted flow where rainfall intensity and upslope overland flow were controlled independently. The experiments involved placing various masses of 500–590 lm sand in a 10 cm long source zone, the top of which was nearly half way down the 80 cm long flume. Rainfall was applied by 4 hypodermic needles that oscillated along two orthogonal tracks 3 m above the flume. A full cycle up and down the flume was completed every 22 s. Shaw et al. concluded that, for initial spatial densities greater than about 0.036 g cm~2 in the source zone, the rate of increase in the peak rate of the loss of sand from the flume with increasing spatial density was constrained over the range of inflows (305–565 mL min~(-1)) and rainfall rates (0.07–0.13 cm min~(-1) used in their experiments. As a result, Shaw et al. developed a finite difference model based on the approach developed by Hairsine and Rose (1991) which yielded.