کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6426411 | 1634109 | 2015 | 19 صفحه PDF | دانلود رایگان |
- Soil surface type influenced uât and sediment production rates.
- Soils with weak physical crusts had the lowest uât and sediment production rates.
- Disturbance reduced sediment production.
- Silt and clay, penetrometer force, and aggregate stability useful to estimate uât.
Disturbance of lacustrine and alluvial soils could increase aeolian dust emissions in the eastern Great Basin, but little is known about the susceptibility of these land surfaces to wind erosion. Threshold friction velocity (uât), a necessary parameter to estimate wind erosion potential, is difficult to accurately measure; methods to estimate uât from alternate measurements would be useful. We measured uât and sediment production rate with a portable wind tunnel, and quantified relationships between uât and eleven easier-to-measure soil surface properties for both undisturbed and disturbed lacustrine and alluvial soils in Snake Valley, Utah. Soil surface type and disturbance significantly influenced uât, sediment production rate, and the relationships between uât and easier-to-measure soil surface properties. Only soils with surficial rock fragments and weak physical crusts reached uât before disturbance, whereas all surface types reached uât following disturbance. Soils with weak physical crusts had the lowest average uât and highest average sediment production rate before and after disturbance. Surprisingly, however, disturbance reduced sediment production rate. Soils with weak physical crusts and surficial rock cover are likely the most susceptible to wind erosion and subsequent dust generation both before and after disturbance. Silt concentration and penetrometer resistance were significant predictors of uât in undisturbed soils with weak physical crusts and surficial rock cover. Following disturbance, clay concentration and aggregate stability were significant predictors for soils with hard salt crusts and surficial rock cover. Prediction of uât using alternate measurements is promising, but uât measurement uncertainty must be considered.
Journal: Aeolian Research - Volume 18, September 2015, Pages 185-203