Channelization driven by subsurface flow through a sand pile: experimental results
Abstract
We study formation and growth of fluvial channels in a pile of sand. Water enters the pile at some depth within the pile and emerges on the surface. Using laser and digital imaging techniques, we obtain three-dimensional topographic maps as a function of time. Channels form in a narrow range of slopes and water pressures. After the incision, channels compete for ground water. Some channels grow in depth, length and width, while other channels are filled. The growing channels are spaced roughly periodically with a length scale that decreases with the applied water pressure. We present an analysis of our data with emphasis on the dependence of the channel spacing and growth on the slope and water pressure.
- Publication:
-
APS March Meeting Abstracts
- Pub Date:
- March 2003
- Bibcode:
- 2003APS..MARA13004J