identification of runoff formation with two dyes in a mid-latitude mountain headwater
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2017
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Abstract
Subsurface flow in peat bog areas and its role in the hydrologic cycle has
garnered increased attention as water scarcity and floods have increased due
to a changing climate. In order to further probe the mechanisms in peat bog
areas and contextualize them at the catchment scale, this experimental study
identifies runoff formation at two opposite hillslopes in a peaty mountain
headwater; a slope with organic peat soils and a shallow phreatic zone
(0.5 m below surface), and a slope with mineral Podzol soils and no
detectable groundwater (> 2 m below surface). Similarities and
differences in infiltration, percolation and preferential flow paths between
both hillslopes could be identified by sprinkling experiments with Brilliant
Blue and Fluorescein sodium. To our
knowledge, this is the first time these two dyes have been compared in their
ability to stain preferential flow paths in soils. Dye-stained soil profiles
within and downstream of the sprinkling areas were excavated parallel
(lateral profiles) and perpendicular (frontal profiles) to the slopes'
gradients. That way preferential flow patterns in the soil could be clearly
identified. The results show that biomat flow, shallow subsurface flow in the
organic topsoil layer, occurred at both hillslopes; however, at the peat bog
hillslope it was significantly more prominent. The dye solutions infiltrated
into the soil and continued either as lateral subsurface pipe flow in the
case of the peat bog, or percolated vertically towards the bedrock in the
case of the Podzol. This study provides evidence that subsurface pipe flow,
lateral preferential flow along decomposed tree roots or logs in the
unsaturated zone, is a major runoff formation process at the peat bog
hillslope and in the adjacent riparian zone.
| Reference Key |
vlek2017hydrologyidentification
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|---|---|
| Authors | ;L. Vlček;K. Falátková;P. Schneider |
| Journal | materials research bulletin |
| Year | 2017 |
| DOI |
10.5194/hess-21-3025-2017
|
| URL | |
| Keywords |
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