Validation of WEQ, RWEQ and WEPS wind erosion for different arable land management systems in the Argentinean Pampas
Agricultural practice ; Argentina ; La Pampa ; Model ; Pampa ; Semi-arid area ; Soil erosion ; Wind ; Wind erosion
As an effort to apply wind erosion models, the AA. compared field wind erosion measurements carried out during 4 years in a bare soil reference plot and during 3 years in the same soil with different tillage conditions. Wind erosion was predicted
with : 1) subroutines for single storm event versions of the wind erosion prediction system (WEPS) and the revised wind erosion equation (RWEQ), for which the climatic data of each single storm were used, and 2) the wind erosion equation (WEQ) for full
as a reliable prediction model for long-term predictions of wind erosion in the semi-arid pampas, even when run with limited available climatic data for this region.
Predicting the effect of tilling practices on wind erosion activity : application of the Wind Erosion Prediction System in a sand drift area in The Netherlands
Aeolian features ; Agricultural practice ; Experimentation ; Forecast ; Model ; Netherlands (The) ; Simulation ; Wind erosion
-month experiment at Kootwijkerzand. The effectiveness of the techniques to reactivate the aeolian processes was measured by investigating their effect on the horizontal sediment flux. Furthermore, the Wind Erosion Prediction System was used to simulate
A three-dimensional analysis on lift-off velocities of sand grains in wind-blown sand flux
Aeolian features ; Aeolian transport ; China ; Comparative study ; Gansu ; Model ; Sand ; Wind
This paper focuses on a key problem in wind-blown sand transport research, the lift-off velocities of sand grains. A three-dimensional grain-bed collision model comprising an impact sand grain, a creeping sand grain and a sustaining grain
to be influenced by, 1) interparticle cohesion (ice-bonding); 2) diurnal variations in the speed of thermally driven easterly valley winds due to reduce solar heating by night; and 3) topographically modified foehn southwesterly winds. Warm, dry and gusty foehn
southwesterly winds were found to promote aeolian processes by dislodging surface sediments, with dune morphology responding rapidly. As a result, change in the morphology of the dunes of the Victoria Valley may provide an early indication of change in regional
Aeolian features ; Aeolian transport ; Arid area ; China ; Desert ; Dune ; Gansu ; Model ; Slope gradient ; Threshold ; Wind
A computational fluid dynamics (CFD) model is used to simulate a stable wind blowing over slope beds of varying height and coupled with the slope-compensating fluid threshold friction velocity formula. Based on the CFD-based model, quantitative
[b2] USDA-ARS-Wind Erosion and Water Conservation Research Unit, Texas, Big Spring, Etats-Unis
Aeolian features ; Aeolian transport ; Aggregate ; California ; Experimentation ; Grain size distribution ; Sand ; Soil properties ; Threshold ; United States of America ; Wind
equal to the ratio of the horizontal flux of saltating particles to Owen's function of wind, times air density by gravitational acceleration. Values of A can be used to : 1) characterize the efficiency of the wind to move sand by saltation for different
operations is many times higher than by natural wind erosion. The AA. used a wind tunnel as a cross-flow gravitational separator to investigate the relation between soil type, soil moisture and fine dust emission. Twelve soils of different texture were