Investigation of rainfall kinetic energy in Central Europe and New Zealand

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F18%3A00323647" target="_blank" >RIV/68407700:21110/18:00323647 - isvavai.cz</a>

Result on the web

—

DOI - Digital Object Identifier

—

Result language

angličtina

Original language name

Investigation of rainfall kinetic energy in Central Europe and New Zealand

Original language description

Soil erosion has been recognized as the largest threat to soil resources globally. The initial detachment of soil particles through splash erosion is dependent on rainfall kinetic energy (KE), which is a function of drop size distribution and fall velocity. Recent technological progress on disdrometers has enabled improved measurement of rainfall kinetic energy. The aim of this study was 1) to increase knowledge about erosive rainstorms and their KE/erosivity and 2) to derive KE-intensity (I) relationships for rainfall erosivity estimation. Measurement of rainfall was carried out at two sites in the eastern part of Austria (Mistelbach and Petzenkirchen), one site in the Czech Republic (Prague) and another site in New Zealand (Christchurch), allowing evaluation and interpretation of possible differences between the investigated sites. Rainfall data were collected in 1-minute intervals using Campbell PWS100 (Mistelbach/Petzenkirchen), Thies Clima (Prague), and Parsivel OTT (Christchurch) disdrometers, which mesure a matrix of drop sizes and drop fall velocities and thereby enable direct calculation of kinetic energy. To compare disdrometer performance, rain gauges were also installed at the measurement sites. Data for the sites in the Czech Republic and New Zealand still needs to be analysed. The precipitation measured by the disdrometer in Petzenkirchen matched that measured by the rain gauges very well. In Mistelbach rainfall was underestimated by approximately 10%. The kinetic energy of rain events was calculated from the drop size/velocity matrix. For both sites data show very similar relationships between rainfall arount and KE with R2 between 0.83 and 0.91. In addition, the two sites showed also very similar KE-I relationships within the measured intensity range. Results show that these equations describe KE well or slightly underestimated our observations.

Czech name

—

Czech description

—

Type

O - Miscellaneous

CEP classification

—

OECD FORD branch

10501 - Hydrology

Project

<a href="/en/project/GF17-33751L" target="_blank" >GF17-33751L: Kinetic energy of rainfall as driving force of soil detachment and transport</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2018

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů