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The size distribution metrics and kinetic energy of raindrops above and below an isolated tree canopy in urban environmentAlivio, Mark Bryan ; Bezak, Nejc, hidrologija ; Mikoš, MatjažRaindrop impact on bare soils is the initial phase of rainfall-induced soil erosion which is altered under any type of vegetation due to the interactions of rainfall with the canopies. This study ... examines the drop size distribution (DSD) and kinetic energy (KE) of raindrops above and below the birch tree (Betula pendula Roth.) canopy in a research plot in the city of Ljubljana, Slovenia using a one-year observation of 63 rainfall events and the effect of meteorological variables under moderate continental climate. Simultaneous measurement of the microstructures of open rainfall and throughfall was carried out using an optical disdrometer. The result of our analysis revealed that throughfall DSD showed two distinct major peaks (bimodal) occurring primarily on smaller drop sizes while open rainfall has only one. The cumulative drop number, median drop-volume diameter (D50), and drop fall velocity of throughfall were 16.4%, 26.6%, and 5.0% lower than those of open rainfall, respectively. Also, the relative volume percentage of raindrops > 1.5 mm is 1.5 times higher than those observed in throughfall drops which indicates that the presence of the canopy caused the fractionation of larger drops into smaller droplets. These reductions significantly differ depending on the phenoseasons of the canopy with the leafed state being higher than the leafless state. Similarly, the Kruskal-Wallis H test result revealed that birch tree elicits a statistically significant change in the kinetic energy of open rainfall, thus weakening the mean rainfall KE by 33.7%. On the other hand, KE is positively affected by the phenological condition of the canopy with higher attenuation being observed during its leafed state. Also, the correlation analysis demonstrated that vapor pressure deficit, air temperature, and relative humidity have stronger associations with throughfall kinetic energy among meteorological variables considered. These findings underscore the necessity of an optimized selection of tree species for afforestation programs.Source: Urban Forestry and Urban Greening. - ISSN 1618-8667 (Art. 127971, Vol. 85, maj 2023, str. 1-13)Type of material - article, component part ; adult, seriousPublish date - 2023Language - englishCOBISS.SI-ID - 152988675
Author
Alivio, Mark Bryan |
Bezak, Nejc, hidrologija |
Mikoš, Matjaž
Topics
birch tree |
drop size distribution |
phenoseasons |
rainfall |
throughfall kinetic energy |
urban environment |
breza |
porazdelitev kapljic |
fenofaze |
padavine |
kinetična energija prepuščenih padavin |
urbano okolje |
hidrologija
source: Urban Forestry and Urban Greening. - ISSN 1618-8667 (Art. 127971, Vol. 85, maj 2023, str. 1-13)
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Database name | Field | Year |
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Links to authors' personal bibliographies | Links to information on researchers in the SICRIS system |
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Alivio, Mark Bryan | |
Bezak, Nejc, hidrologija | 35409 |
Mikoš, Matjaž | 08245 |
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