| Abstract: | Rainfall-runoff simulations were conducted to estimate the characteristics of the steady-state infiltration rate into 1-m2 north- and south-facing hillslope plots burned by a wildfire in October 2003. Soil profiles in the plots consisted of a two-layer system composed of an ash on top of sandy mineral soil. Multiple rainfall rates (18.4-51.2 mm h-1) were used during 14 short-duration (30 min) and 2 long-duration simulations (2-4 h). Steady state was reached in 7-26 min. Observed spatially-averaged steady-state infiltration rates ranged from 18.2 to 23.8 mm h-1 for north-facing and from 17.9 to 36.0 mm h-1 for south-facing plots. Three different theoretical spatial distribution models of steady-state infiltration rate were fit to the measurements of rainfall rate and steady-state discharge to provided estimates of the spatial average (19.2-22.2 mm h-1) and the coefficient of variation (0.11-0.40) of infiltration rates, overland flow contributing area (74-90% of the plot area), and infiltration threshold (19.0-26 mm h-1). Tensiometer measurements indicated a downward moving pressure wave and suggest that infiltration-excess overland flow is the runoff process on these burned hillslope with a two-layer system. Moreover, the results indicate that the ash layer is wettable, may restrict water flow into the underlying layer, and increase the infiltration threshold; whereas, the underlying mineral soil, though coarser, limits the infiltration rate. These results of the spatial variability of steady-state infiltration can be used to develop physically-based rainfall-runoff models for burned areas with a two-layer soil system. ?? 2010 Elsevier B.V. |
| Genre: | Article |
| ProdID: | 70033951 |
| Citation Author: | Kinner, D. A.; Moody, J. A. |
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| Citation End Page: | 332 |
| Citation Issue: | 3-4 |
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| Citation Language: | English |
| Citation Larger Work Title: | Journal of Hydrology |
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| Citation Number Of Pages: | 11 |
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| Citation Search Results Text: | Spatial variability of steady-state infiltration into a two-layer soil system on burned hillslopes; 2010; Article; Journal; Journal of Hydrology; Kinner, D. A.; Moody, J. A. |
| Citation Start Page: | 322 |
| Citation Volume: | 381 |
| Citation Year: | 2010 |
| Type: | citation/reference |
| Text: | Spatial variability of steady-state infiltration into a two-layer soil system on burned hillslopes; 2010; Article; Journal; Journal of Hydrology; Kinner, D. A.; Moody, J. A. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1016/j.jhydrol.2009.12.004 |
| Date Other: | Fri, 1 Jan 2010 00:00 -0600 |
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