Rainfall Erosivity and It's Estimation for Australia's Tropics

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Title Rainfall Erosivity and It's Estimation for Australia's Tropics
Author Yu, Bofu
Journal Name Australian Journal of Soil Research
Year Published 1998
Place of publication Australia
Publisher CSIRO Publishing
Abstract Pluviograph data at 6-min intervals for 41 sites in the tropics of Australia were used to compute the rainfall and runoff factor (R-factor) for the Revised Universal Soil Loss Equation (RUSLE), and a daily rainfall erosivity model was validated for these tropical sites. Mean annual rainfall varies from about 300 mm at Jervois (015602) to about 4000 at Tully (032042). The corresponding R-factor ranges from 1080 to 33500 MJ·mm/(ha ·h·year). For these tropical sites, both rainfall and rainfall erosivity are highly seasonal with a single peak in February mostly. Summer months (November–April) typically contribute about 80% of annual rainfall and about 90% of the R-factor. The daily erosivity model performed better for the tropical sites with a marked wet season in summer in comparison to model performance in temperate regions of Australia where peak rainfall and peak rainfall erosivity may occur in different seasons. A set of regional parameters depending on seasonal rainfall was developed so that the R-factor and its seasonal distribution can be estimated for sites without pluviograph data. The prediction error using the regional parameter values is about 20% for the R-factor and 1% for its monthly distribution for these tropical sites.
Peer Reviewed Yes
Published Yes
Alternative URI http://dx.doi.org/10.1071/S97025
Volume 36
Page from 143
Page to 165
ISSN 0004-9573
Date Accessioned 1999-01-01
Language en_AU
URI http://hdl.handle.net/10072/31126
Publication Type Article in Scholarly Refereed Journal
Publication Type Code c1

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