Journal article
Monitored and simulated variations in matric suction during rainfall in a residual soil slope
Environmental Geology, Vol.55(5), pp.951-961
2008
Abstract
This research combines field, laboratory and numerical investigations to estimate the development of a wetting front within a 1.2 m residual soil mantle on a steep forested slope during rainfall events. The field-monitored variations in matric suction due to rain-water infiltration during various events revealed that the maximum infiltration rate was much higher when the wetting front resided in the upper 20 cm of soil compared to the case when the wetting front advanced to depths > 20 cm. Laboratory investigations on soil hydraulic properties (i.e., soil water characteristic curve, and hydraulic conductivity) were useful to establish the parameters of a multilayer finite-element model for one-dimensional vertical infiltration. These parameters were subsequently calibrated by matching the predicted and field measured transient pore water pressure responses during actual rainstorms with irregular rainfall patterns. The calibrated simulation model was used to assess the migration of the wetting front under uniform rainfall with different intensities. Based on the numerical results, a hyperbolic equation was developed to predict the duration of uniform rainfall required for the propagation of wetting front to a certain depth for a given rainfall intensity. The proposed equation was subsequently tested against field-monitored advancements of the wetting front during real rainstorms with variable rainfall intensity. © 2007 Springer-Verlag.
Details
- Title
- Monitored and simulated variations in matric suction during rainfall in a residual soil slope
- Authors
- A C Trandafir (Author) - University of Utah, United StatesRoy C Sidle (Author) - Kyoto UniversityT Gomi (Author) - Kyoto University, JapanT Kamai (Author) - Kyoto University, Japan
- Publication details
- Environmental Geology, Vol.55(5), pp.951-961
- Publisher
- Springer
- Date published
- 2008
- DOI
- 10.1007/s00254-007-1045-7
- ISSN
- 0943-0105
- Organisation Unit
- University of the Sunshine Coast, Queensland; Sustainability Research Cluster
- Language
- English
- Record Identifier
- 99450106002621
- Output Type
- Journal article
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- Environmental Sciences
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- Water Resources
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