Tracer and hydrometric study of preferential flow in large undisturbed soil cores from the Georgia Piedmont, USA
Hydrological Processes
By: Janice McIntosh, Jeffrey J. McDonnell, and Norman E. Peters
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Abstract
We studied the temporal patterns of tracer throughput in the outflow of large (30 cm diameter by 38 cm long) undisturbed cores from the Panola Mountain Research Watershed, Georgia. Tracer breakthrough was affected by soil structure and rainfall intensity. Two rainfall intensities (20 and 40 mm hr-1) for separate Cl- and Br- amended solutions were applied to two cores (one extracted from a hillslope soil and one extracted from a residual clay soil on the ridge). For both low and high rainfall intensity experiments, preferential flow occurred in the clay core, but not in the hillslope core. The preferential flow is attributed to well-developed interpedal macrochannels that are commonly found in structured clay soils, characteristic of the ridge site. However, each rainfall intensity exceeded the matrix infiltration capacity at the top of the hillslope core, but did not exceed the matrix infiltration capacity at the middle and bottom of the hillslope core and at all levels in the clay core. Localized zones of saturation created when rainfall intensity exceeds the matrix infiltration capacity may cause water and tracer to overflow from the matrix into macrochannels, where preferential flow occurs to depth in otherwise unsaturated soil. Copyright © 1999 John Wiley & Sons, Ltd.
Suggested Citation
McIntosh, J., McDonnell, J.J., and Peters, N.E., 1999, Tracer and hydrometric study of preferential flow in large undisturbed soil cores from the Georgia Piedmont, USA: Hydrological Processes, v. 13, no. 2, p. 139-155, https://doi.org/10.1002/(SICI)1099-1085(19990215)13:2<139::AID-HYP703>3.0.CO;2-E.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Tracer and hydrometric study of preferential flow in large undisturbed soil cores from the Georgia Piedmont, USA |
| Series title | Hydrological Processes |
| DOI | 10.1002/(SICI)1099-1085(19990215)13:2<139::AID-HYP703>3.0.CO;2-E |
| Volume | 13 |
| Issue | 2 |
| Year Published | 1999 |
| Language | English |
| Publisher | John Wiley & Sons, Ltd. |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Hydrological Processes |
| First page | 139 |
| Last page | 155 |