Alvarez-Mozos, "Accuracy of methods for field assessment of rill and ephemeral gully erosion," Catena, vol.
Poesen, "Assessment of soil losses by ephemeral gully erosion using high--altitude (stereo) aerial photographs," Earth Surface Processes and Landforms, vol.
Nachtergaele J, Poeson A, Steegen I, Takkcn I, Beuselinck L, Vandekerckhove L, Govers G (2001) The value of a physical based model versus an empirical approach in the prediction of ephemeral gully
erosion for loess-derived soils.
They used historical precipitation data, on-site field observations, and recently developed watershed-modeling technology to simulate the effect of tillage practices on long-term ephemeral gully growth and evolution.
Their findings suggest that, on average, tillage in areas prone to ephemeral gully erosion can produce significantly higher soil erosion rates compared to those same regions under no-till management practices.
If we include ephemeral gully
erosion in those estimates and include degradation of water quality and aquatic resources in our calculations, I fear the number of acres eroding at "unsustainable" rates would be much larger than 100 million acres.
* ephemeral gully
erosion--ephemeral gullies are large rills.
Bielders, "Assessing the regional and temporal variability of the topographic threshold for ephemeral gully
initiation using quantile regression in Wallonia (Belgium)," Geomorphology, vol.
The other study focused on the fact that sediment delivery information from ephemeral gullies is weak and tried to estimate sediment movement in a small ephemeral gully
under forest vegetation (Hansen and Law forthcoming).
Assessment of factors affecting ephemeral gully
erosion in cultivated catchments of the Belgian Loam Belt.
The fact that these areas are also prone to ephemeral gully
formation is not considered here, as the (R)USLE was not designed to account for this erosion form.
Soil conservationists began systematic study of ephemeral gully
erosion only in the last decade (5).