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| Format: | Artículo científico |
| Language: | en |
| Published: |
Universitat de Barcelona
2004
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| Online Access: | https://www.redalyc.org/articulo.oa?id=50520206 |
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Table of Contents:
- Instability driven flow and runoff formation in a small catchment M. Tesar M. Sír J. Prazák L. Lichner Ciencias de la Tierra Soil Runoff Rainfall Hydrology Catchment Two anomalous phenomena were observed in a small catchment: 1) In some situations, the water supplied byrain caused a pronounced decrease in the soil water content. 2) In these periods, the soil water movement couldbe explained only by assuming an irregularly oscillating outflow of soil water into lower horizons. In these situationsa large volume of water flows through the soil; therefore, on the hydrological scale, this phenomenonforms a great part of the outflow from a watershed. These phenomena are described in the frame of the instabilitydriven flow theory and explained as consequences of the porous soil bodys capacity to become conductiveas a result of a very little change of its moisture content. Therefore the soil profile can attenuate or amplify therainfall pulses during their transformation to the outflow below the soil profile. If the soil water content is lowerthan the threshold value, the rainfall pulses can be suppressed down to zero. If the soil profile contains morewater, the soil does not attenuate the rainfall pulses and it can even amplify them by adding the released soilwater. This is the mechanism of rapid growth of rising hydrograph limb during a storm event. The rapid transportof the soil water can occur in any part of the porous soil body regardless of the pore size and can be causedby any rainfall event with any intensity, duration or total volume. 2004 artículo científico 1695-6133 https://www.redalyc.org/articulo.oa?id=50520206 en http://www.redalyc.org/revista.oa?id=505 Geologica Acta: an international earth science journal application/pdf Universitat de Barcelona Geologica Acta: an international earth science journal (España) Num.2 Vol.2