Estimation of the annual rainfall erosivity index based on hourly rainfall data in a tropical region

Abstract

The annual mean rainfall erosivity (R) indicates the potential soil loss caused by the precipitation and runoff and is used to predict the soil loss from agricultural hillslopes. R is calculated from rainfall stations with continuously recording rainfall databases. However, many short-term real-time rainfall databases that also relate to the rainfall intensity are not readily available around Taiwan, with the hourly rainfall data being predominantly available. The annual mean rainfall erosivity calculated by the 10-min rainfall data accumulation converted to the 30-min rainfall data (R<sub>10_30</sub>) can be estimated using the annual mean rainfall erosivity calculated by the 10-min rainfall data accumulation convert to the hourly rainfall data (R<sub>10_60</sub>) that are calculated from the kinetic energy calculated by the 10-min rainfall data accumulation converted to the hourly rainfall data (E<sub>60j</sub>). The maximum 60-min rainfall intensity calculated by the 10-min rainfall data accumulation converted to the hourly rainfall data (I<sub>60j</sub>) has been established in rainfall stations throughout southern Taiwan. The 10-min rainfall data set consists of 15 221 storm events from 2002 to 2017 monitored by 51 rainfall stations located in the tropical regions in Taiwan. According to the results of this study, the average conversion factors of the kinetic energy (1.04), rainfall erosivity (1.47), and annual mean rainfall erosivity (1.30) could be estimated based on the 10-min rainfall data.

Detection of high erosion risk areas and their incorporation into environmental impact assessment

“…Land erodability can be defined as the resistance of its soil to the processes of disintegration and crumbling of particles (Rueda et al 2010). Rainfall is often considered to be the main soil erosion agent (Pimentel & Kounang 1998), which is why special attention is paid to the rain-soil relationship and its erosive effects (Lee & Hsu 2021). Furthermore, it is generally accepted that the erodability of soil will depend greatly on its physical and chemical properties, although the type of vegetation cover has a decisive influence as well (Zhou et al 2008;Çomakli & Turgut 2021;Kabelka et al 2021).…”