Despite the uncertainty of previous R-factor calculations using pluviograph data from different periods, the minimum value of coefficient of efficiency is 0.
Yu B, Rosewell CJ (1998) RECS: A program to calculate the R-factor for the USLE/RUSLE using BOM/ AWS Pluviograph data.
The 6-min pluviograph data were processed to determine the following daily storm characteristics: rain amount, rain duration (du), time to peak rain intensity as a fraction of rain duration (tp), and the ratio of peak rain intensity over average rain intensity (ip).
The higher than expected peak intensity produced by CLIGEN may also have to do with the fact that CLIGEN attempts to generate instantaneous peak intensity while the original pluviograph data are at 6-min intervals.
Wischmeier and Smith (1978) recommended that at least 20 years of pluviograph data be used so that the natural climatic variations can be accommodated in much the same way as long-term rainfall data are needed to calculate the mean annual rainfall.
Such a model can be used to estimate the R-factor as well as its seasonal distribution of rainfall erosivity using daily rainfall data which are much more readily available than the pluviograph data.
2 indicate that the pluviographs measured significantly less precipitation than the automated weather stations.
The pluviographs showed a weak maximum in the early morning.
To refine and update the spatiotemporal variations, the aims of this study were to provide (i) rainfall erosivity values calculated using 6-min pluviograph data (Bureau of Meteorology 1989) from NSW; (if) site-specific parameter values for improved parameterisation for NSW for the standard 30-year climatology of 1961-90 as the reference period of climate normals (Bureau of Meteorology 2007); (Hi) time-series rainfall erosivity maps for NSW at monthly and annual interval at a high spatial resolution (100 m); and (iv) an impact analysis of rainfall on rainfall erosivity and hillslope erosion.
For application of the daily rainfall erosivity model, geo-referenced regional relationships are needed for locations where no pluviograph data are available.
year were derived from pluviograph records from 29 stations in Victoria, spanning 346 complete station years.
The authors argued that the erosivity values estimated from IFD data are more generally reliable than the R factor determined from an individual rainfall station, especially where the length of the pluviograph record is <30 years.