Dr. Xihua Yang Profile

Dr. Xihua Yang

at New South Wales Office of Environment & Heritage

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Proceedings Article | 28 October 2006 Paper

Soil erosion modelling for NSW coastal catchments using RUSLE in a GIS environment

Xihua Yang, Greg Chapman

Proceedings Volume 6420, 642023 (2006) https://doi.org/10.1117/12.713019

KEYWORDS: Soil science, Geographic information systems, Modeling, Data modeling, Particles, Image resolution, Forestry, Associative arrays, Factor analysis, Standards development

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In this study, hillslope erosion risk has been estimated for all eastern New South Wales (NSW) catchments, Australia using Revised Universal Soil Loss Equation (RUSLE) in a geographic information system (GIS) environment. Rainfall-runoff erosivity (R) factor was interpolated from NSW rainfall-erosivity contour (isoerodent) data. Soil erodibility (K) factor was based on the soil regolith stability and sediment yield classification. The classification was derived from soil landscape and related soil map data. The slope length and steepness (LS) factor was derived from high resolution digital elevation model (DEM). A fully-automated program using Arc Macro Language (AML) produced RUSLE-based LS factor grids for all coastal catchments. The outputs are comparable to the range of LS values summarised in the literature. Cover and management (C) factor and conservation support-practices (P) factor were set to one. They are intended to be allocated according to land use, ground cover and erosion control provisions for particular land management actions. The resulting erosion risk map, with pixel size of 25-m, provides unprecedented resolution of relative expected sheet and rill erosion across all NSW costal catchments and can be adapted for a range of erosion control purposes such as bushfire hazard reduction and comprehensive costal assessment.

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