Cited by 28Soil erosion and sediment transportHydrology and Sediment Transport ProcessesTree Root and Stability Studies

EROSION PROCESSES IN GULLIES MODIFIED BY ESTABLISHING GRASS HEDGES

S. M. Dabney, F. D. Shields, Jr., D. M. Temple, E. J. Langendoen·2004·Transactions of the ASAE

Abstract

Concentrated flow can cause gully formation on sloping lands and in riparian zones of floodplains adjacent toincising stream channels. Current practice for riparian gully control involves blocking the gully with an earthen embankmentand installing a pipe outlet. Measures involving native vegetation would be more attractive for habitat recovery and economicreasons. To test the hypothesis that switchgrass (Panicum virgatum L.) hedges planted at 0.5 m vertical intervals within a gullywould control erosion, we established a series of hedges in several concentrated flow channels. Two of the channels werepreviously eroded trapezoidal channels cut into compacted fill in an outdoor laboratory. The other channels were locatedat the margin of floodplain fields adjacent to an incised stream channel (Little Topashaw Creek) in Chickasaw County,Mississippi. While vegetation was dormant following two growing seasons, we created artificial runoff events in our testgullies using synthetic trapezoidal-shaped hydrographs with peak discharge rates of approximately 0.03, 0.07, and 0.16 m3s-1, flow rates similar to those observed during natural runoff events in gullies at Topashaw. During these tests, we monitoredflow depth, velocity, turbidity, and soil pore water pressures. Flow depths were generally <0.3 m, and flow velocities variedspatially and exceeded 2.0 m s-1 at the steepest points in some tests. Erosion rates remained modest for the conditions tested,as long as slopes were less than 3 horizontal to 1 vertical (33%) and step height between hedges was less than 0.5 m. Stabilitymodeling of soil steps reinforced with switchgrass roots showed that cohesive forces were 3 times greater than shearing forcesfor 0.5 m step heights, and that therefore mass failure was unlikely even with the surcharge weight of a 0.2 m depth of pondedwater. For step heights greater than 1 m, however, mass failure was observed and predicted to be the dominant erosionmechanism.

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Crossref · 10.13031/2013.17634

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  • Increases in soil organic carbon under switchgrass were likely caused by belowground carbon input from root biomass and rhizodeposition and decreased soil organic matter losses by erosion.

    “Increases in SOC under switchgrass were likely caused by belowground C input from root biomass and rhizodeposition [11,45] and decreased soil organic matter losses by erosion [6].”

    From Soil Carbon Storage by Switchgrass Grown for Bioenergy (2008) · cites this paper as [6]

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Authors
Dabney, S. M., Shields, F. D., Jr., Temple, D. M., & Langendoen, E. J.
Venue
Transactions of the ASAE
Published
2004
Volume
47
Issue
5
Pages
1561-1571
ISSN
  • 0001-2351 (ISSN-L)
  • 2151-0059
OpenAlex
W2049317705
Cited by
28
References
19
Citations by year
2023: 1 · 2021: 1 · 2020: 3 · 2019: 2 · 2018: 2 · 2017: 1 · 2015: 3 · 2014: 1 · 2013: 3 · 2012: 1
FWCI
1.76
Type
journal article
Language
en
Open access
closed
Locations
Transactions of the ASAE (publishedVersion)
Topics
  • Life Sciences › Agricultural and Biological Sciences › Soil Science › Soil erosion and sediment transport
  • Physical Sciences › Environmental Science › Ecology › Hydrology and Sediment Transport Processes
  • Physical Sciences › Engineering › Mechanical Engineering › Tree Root and Stability Studies
Keywords
gully erosion, switchgrass, concentrated flow, step height, mass failure, soil stability, soil pore water pressure, turbidity

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