Use of disdrometer data to evaluate the relationship of rainfall kinetic energy and intensity (KE-I).

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ID: 75748
2016
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Abstract
Determination of rainfall kinetic energy (KE) is required to calculate erosivity, the ability of rainfall to detach soil particles and initiate erosion. Disdrometers can measure rainfall KE by measuring raindrop size and velocity. In the absence of such devices, KE is usually estimated with empirical equations that derive KE from measured rainfall intensity (I). We evaluated the performance of 14 different KE-I equations to estimate the 1min KE and event total KE, and compared these results with 821 observed rainfall events recorded by an optical disdrometer in the inner Ebro Basin, NE Spain. We also evaluated two sources of bias when using such relationships: bias from use of theoretical raindrop terminal velocities instead of measured values; and bias from time aggregation (recording rainfall intensity every 5, 10, 15, 30, and 60min). Empirical relationships performed well when complete events were considered (R(2)>0.90), but performed poorly for within-event variation (1min resolution). Also, several of the KE-I equations had large systematic biases. When raindrop size is known, estimation of terminal velocities by empirical laws led to overestimates of raindrop velocity and KE. Time aggregation led to large under-estimates of KE, although linear scaling successfully corrected for this bias.
Reference Key
angulomartnez2016usethe Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Angulo-Martínez, M;Beguería, S;Kyselý, J;
Journal The Science of the total environment
Year 2016
DOI
S0048-9697(16)31162-7
URL
Keywords
drop size distribution (dsd) kinetic energy-intensity (ke-i) relationship raindrops fall velocity rainfall erosivity rainfall kinetic energy

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