Effect of erosive effcient rains specification on rainfall erosivity factor.
- Resource Type
- Article
- Authors
- STŘEDOVÁ, Hana; ŠTĚPÁNEK, Petr; STŘEDA, Tomáš; NEJEDLÍK, Pavol
- Source
- Contributions to Geophysics & Geodesy. 2023, Vol. 53 Issue 3, p301-318. 18p.
- Subject
- *UNIVERSAL soil loss equation
*EROSION
*SOIL erosion
*SOIL protection
*RAINFALL
*STATISTICAL correlation
*AGRICULTURAL processing
- Language
- ISSN
- 1335-2806
The water erosion represents one of the most dangerous degradation processes on agricultural land. Its estimation is thus necessary for setting rules and defining appropriate strategies for soil protection. An estimation of a long-term average annual soil loss by water erosion is frequently based on the Universal Soil Loss Equation (USLE) defined as a product of six factors, where rainfall erosivity factor (R factor) is a leading one. R factor is a multi-annual average index that measures rainfall kinetic energy and intensity describing the effect of erosive effcient rains (EER) on sheet and rill erosion. EER were defined by total higher than 12.7 mm and intensity higher than 6.4 mm in 15 minutes. As those ERR criteria are being used differently by various studies, we decided to compare R factor derived by two variants of ERR criteria: i) EER must fulfil both minimal total and minimal intensity (VAR AND); ERR must fulfil either minimal total or minimal intensity (VAR OR). Based on 1-minute precipitation totals database of Czech hydrometeorological institute for 111 stations for 1991-2021 we conclude that mean of Ra VAR AND across altitude is about 30% lower than Ra VAR OR while there is high statistical significant correlation between those two variants. In addition, annual values of R factor derived by both variants show a statistically significant increase in a long run which calls for updating the R-factor values to reect increasing climate change impacts. [ABSTRACT FROM AUTHOR]