RMerosivity: RMerosivity

In USGS-R/Rainmaker: Rainfall event processing

RMerosivity

Description

This function computes the erosive power of the rainfall

Usage

RMerosivity(df, ieHr, method, rain = "rain", StormSummary = StormSummary)

Arguments

df	dataframe with instantaneous rainfall and events calculated. This is the 'tipsbystorm' output from RMevents, or the third list component from the output of RMevents. This dataframe must include colums for rain values, dates, 'dif_time' or the time elapsed from one tip (row) to the next, and 'event' which numbers each row or tip by which event to which it belongs (starting at 1).
ieHr	time between events in hours
method	choose which energy equation to use (see below for more details)
rain	string, column name of rainfall unit values, defaults to "rain"
StormSummary	dataframe output by RMIntense method=1: McGregor (1995) Supercedes Brown and Foster equation (1987), which superceded Agriculture Handbook 537 (1979). method=2: Wischmeier, Agriculture Handbook 537 (1979, 1981), correct computation of formula 2 found in AH537 method=3: Original Rainmaker (1997) USGS Wisconsin Water Science Center, based on equation in Agriculture Handbook 537. Storms with I30>2.5 are incorrectly computed.

References

McGregor, K. C., R. L. Binger, A. J. Bowie, and G. R. Foster. 1995. Erosivity index values for northern Mississippi. Trans. Amer. Soc. Agric. Eng. 38:1039-1047;

Wischmeier, W. H. and D. D. Smith. 1978. Predicting rainfall erosion losses-A guide to conservation planning. U.S. Department of Agriculture, Agriculture Handbook 537, 58 pp.

Wischmeier, W. H. and D. D. Smith. 1981. Supplement and Errata for "Predicting rainfall erosion losses-A guide to conservation planning". U.S. Department of Agriculture, Agriculture Handbook 537, 58 pp.

Renard, K. G., G. R. Foster, G. A. Weesies, D. K. McCool, and D. C. Yoder. 1997. Predicting soil erosion by water: A guide to conservation planning with the Revised Soil Loss Equation (RUSLE). U.S. Department of Agriculture, Agriculture Handbook 703, 404 pp.

USGS-R/Rainmaker documentation built on Oct. 11, 2022, 6:05 a.m.