An evaluation of landscape evolution models to simulate decadal and centennial scale soil erosion in grassland catchments

Hancock, G. R., Coulthard, T. J., Martinez, C. and Kalma, J. D. (2011) An evaluation of landscape evolution models to simulate decadal and centennial scale soil erosion in grassland catchments. Journal of Hydrology, 398 3-4: 171-183. doi:10.1016/j.jhydrol.2010.12.002


Author Hancock, G. R.
Coulthard, T. J.
Martinez, C.
Kalma, J. D.
Title An evaluation of landscape evolution models to simulate decadal and centennial scale soil erosion in grassland catchments
Journal name Journal of Hydrology   Check publisher's open access policy
ISSN 0022-1694
Publication date 2011-02-24
Sub-type Article (original research)
DOI 10.1016/j.jhydrol.2010.12.002
Open Access Status Not yet assessed
Volume 398
Issue 3-4
Start page 171
End page 183
Total pages 13
Place of publication Amsterdam, Netherlands
Publisher Elsevier BV
Language eng
Abstract There are a number of landscape evolution models now developed to the stage where they can be routinely used for both geomorphic evaluations and quantification of soil erosion rates and processes when subject to the action of rainfall and runoff. These models have considerable advantages over traditional modelling approaches as they remove the need to manually determine slope length and angle and because they can also determine both erosion and deposition. A further advantage of digital elevation based models is that they dynamically adjust the landscape in response to erosion and deposition, thus producing a better representation of slope length and angle over the duration of the simulation. A recent advance is that these models now have the ability to employ spatially variable hydrological and erosion parameters, the spatial distribution of soil particle size at user defined soil depths as well as several different flow direction algorithms. While these options are available in these models, minimal evaluation of these hydrological and geomorphological functions has taken place to assess whether they are correct. This study evaluates the well known SIBERIA and CAESAR models for their ability to predict landscape form and erosion for a grassland catchment in South-East Australia under similar rainfall conditions. The results demonstrate that both models predict similar hillslope form as well as erosion rates over a 1000-year modelled period. They also predict erosion rates within the range of independently determined field measured data using environmental tracers at decadal time scales for the site and region demonstrating the models are reliable in the setting examined here.
Keyword CAESAR
Geomorphology
Hydrology
Sediment transport
SIBERIA
Soil erosion modelling
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Agriculture and Food Sciences
 
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