RWEQRevised Wind Erosion Equation
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The RWEQ model (Fryrear et al., 1998) predicts standing and prostrate residue biomass from seed yield, and residue decay based on ambient temperature and precipitation pattern.
The RWEQ model (Fryrear et al., 1998) was used for wind erosion, and the RUSLE model (Renard et al., 1997) was used for water erosion.
Calculated soil loss ratios (SLR) for measured soil coverage by residue with values less than 50 percent using equations in RUSLE (water erosion) and RWEQ (wind erosion) models.
The final test should be the use of EOD in place of OD in equation (2) and then running RWEQ. The RWEQ considers wind direction and surface roughness in addition to barrier EOD in determining the effect of the barrier on wind erosion.
The basic premise of RWEQ is Newton's First Law of Motion.
However, to estimate total transport from a field, RWEQ also includes the suspension component from the soil surface to a height of 2 m (6.6 ft).
An understanding of the interrelationships between field length, soil transport and average soil loss is extremely important to understanding the wind erosion mechanics imbedded in RWEQ. For long fields, the quantity of soil transported at the downwind edge of the field may approach the maximum transport capacity of the wind over that surface.
These differences underscore the need for a new soil roughness factor for RWEQ.
This study was conducted to develop a new soil roughness factor (K[prime]) for the Revised Wind Erosion Equation (RWEQ) model which (1) includes both oriented and random roughness effect; (2) is modified as rainfall decays the soil surface roughness; and (3) is predicted at any given angle with respect to ridge orientation.
The RWEQ model decays roughness following a rainfall event.
This interface is a part of the common effort by all ARS erosion modeling teams (RUSLE, RWEQ, WEPS, and WEPP) to develop a common interactive graphic users interface.
This work is proceeding in concert with the other ARS erosion models-WEPS, RUSLE and RWEQ. Additionally, the Forest Service is developing an interface for WEPP for its new UNIX network.