10 martin locke 2017-08_swcs_svi_beasley_presentation -locke
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72nd SWCS International Annual Conference July 30-August 2, 2017 Madison, WI
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10 martin locke 2017-08_swcs_svi_beasley_presentation -locke
- 1. Soil Vulnerability Index Assessment in Beasley Lake Watershed, Mississippi USDA-ARS National Sedimentation Laboratory, Oxford, MS Martin Locke, Lindsey Yasarer, Ron Bingner SWCS 2017
- 2. Beasley Lake Watershed • Oxbow Lake in the Lower Mississippi Alluvial Plain • Watershed Area: 624 ha • Lake Monitored since 1996 • Lake water, edge-of-field runoff sites monitored for water quality Beasley Lake Monitoring Locations
- 3. SVI Input: Slope • Slope Categories • 0-2: 67.2% • 2-4: 21.6% • 4-6: 5.5% • >6: 5.7% During high intensity rainfall events, water moves off the land via a network of drainage ditches
- 4. SoilTexture and Erodibility in Beasley Lake Watershed Soil Texture
- 5. Hydrologic Soil Group and Soil Runoff Potential SVI Classes: Low: 48%, Moderate: 19%, Moderately High: 24%, High: 9% 1.5m DEM HSG: A: 0%, B: 3%, C: 31%, D: 66%
- 6. SVI Results: Soil Leaching Potential Without artificial drainage With artificial drainage
- 7. Remaining Questions: • How well does SVI correspond to field measurements in BLW? • Without considering rainfall intensity, is the SVI representative of soil runoff potential in this region? • How well does runoff potential with SVI compare with AnnAGNPS?
Notas del editor
- Annual rainfall in Mississippi is about 135 cm per year
- Organic Carbon ca. 1% Not much sand, lots of clay (less erodible); lots of silt (erodible)
- Hydrology soil group is based on low slope, low permeable soils, clays are shrink swell; HSG A: 0%, B: 3%, C: 31%, D: 66%; Group C soils are sandy clay loam. They have low infiltration rates when thoroughly wetted and consist chiefly of soils with a layer that impedes downward movement of water and soils with moderately fine to fine structure. Group D soils are clay loam, silty clay loam, sandy clay, silty clay or clay. This HSG has the highest runoff potential. They have very low infiltration rates when thoroughly wetted and consist chiefly of clay soils with a high swelling potential, soils with a permanent high water table, soils with a claypan or clay layer at or near the surface and shallow soils over nearly impervious material.
- The leaching component of SVI treats surface (ditches) and subsurface (tile) drainage in exactly the same way, i.e., by increasing the risk caused by leaching. Differentiating by type of drainage would respect the processes taking place. Treating ditch drainage the same way artificially inflates the leaching potential in Beasley Lake watershed (figure on the right)