Geospatial scaling of runoff and erosion modeling in the Chihuahuan Desert

Applied Engineering in Agriculture
By:  and 

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Abstract

Large-scale assessments of rangeland runoff and erosion require methods to extend plot-scale parameterizations to large areas. In this study, Rangeland Hydrology and Erosion Model (RHEM) parameters were developed from plot-scale foliar and ground-cover transect data for an arid, grass-shrub rangeland in southern New Mexico, and a method was assessed to upscale transect-plot parameters to a large landscape. The transect-plot data compared favorably to corresponding cell data generated from publicly available geospatial data for total foliar cover but less favorably for litter cover and poorly for rock cover. The RHEM effective hydraulic conductivity (Ke) parameter was comparable between transect-plot and geospatial-cell methods, but the splash and sheet erosion factor (Kss) had poor agreement between the two methods. Simulated runoff and erosion reflected differences in transect-plot and geospatial-cell-based RHEM parameterizations, with low error and very good agreement for runoff but high error and poor agreement for soil loss. These results demonstrate that Ke parameters developed using geospatial data calibrated to plot data can be extrapolated to large spatial areas and provide reasonable simulation of runoff using RHEM. However, these same geospatial methods do not provide reasonable estimation of Kss or simulation of soil loss. Poor representation of litter and rock cover variables, which are highly spatially heterogeneous at the plot scale, was inadequate to accurately represent Kss or soil loss using RHEM. High resolution ground cover data, such as from unmanned aerial systems, may improve parameterization of Kss, and, ultimately, arid rangeland soil erosion simulation.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Geospatial scaling of runoff and erosion modeling in the Chihuahuan Desert
Series title Applied Engineering in Agriculture
DOI 10.13031/aea.13275
Volume 5
Issue 35
Year Published 2019
Language English
Publisher American Society of Agricultural and Biological Engineers
Contributing office(s) New Mexico Water Science Center
Description 11 p.
First page 733
Last page 743
Country United States
State New Mexico
Other Geospatial Chihuahuan Desert