RT Journal Article
SR Electronic
T1 Extension and validation of a geographic information system-based method for calculating the Revised Universal Soil Loss Equation length-slope factor for erosion risk assessments in large watersheds
JF Journal of Soil and Water Conservation
FD Soil and Water Conservation Society
SP 105
OP 111
DO 10.2489/jswc.63.3.105
VO 63
IS 3
A1 Winchell, M.F.
A1 Jackson, S.H.
A1 Wadley, A.M.
A1 Srinivasan, R.
YR 2008
UL http://www.jswconline.org/content/63/3/105.abstract
AB A geographic information system-based (GIS) method for estimating the length-slope (LS) factor of the Revised Universal Soil Loss Equation using national-scale datasets was developed and validated. The method was applied to approximately two-thirds of the Mississippi River basin, focusing on agricultural subwatersheds in the Midwest. The results were validated by comparing the GIS-based statistical distributions of LS-factor values with the distribution of LS-factors calculated from the Natural Resources Inventory database at the eight-digit watershed level. The GIS-based approach was shown to produce statistical distributions of LS-factor values very similar to those described by the Natural Resources Inventory database of field measurements, providing for the first time strong support for using GIS-based methods to represent the spatial heterogeneity and magnitude of LS-factors. Development and validation of the GIS-based approach is an important step toward conducting large-scale erosion potential assessments that have soil conservation implications in natural resources management, agronomy, and agrochemical exposure risk assessments.