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Article

Parameterization of the Collection Efficiency of a Cylindrical Catching-Type Rain Gauge Based on Rainfall Intensity

1
Department of Civil, Chemical and Environmental Engineering, University of Genova,16145 Genoa, Italy
2
WMO/CIMO Lead Centre “B. Castelli” on Precipitation Intensity, 00062 Vigna di Valle (RM), Italy
*
Author to whom correspondence should be addressed.
Water 2020, 12(12), 3431; https://doi.org/10.3390/w12123431
Received: 9 November 2020 / Revised: 3 December 2020 / Accepted: 4 December 2020 / Published: 6 December 2020
Despite the numerous contributions available in the literature about the wind-induced bias of rainfall intensity measurements, adjustments based on collection efficiency curves are rarely applied operationally to rain records obtained from catching-type rain gauges. The many influencing variables involved and the variability of the results of field experiments do not facilitate the widespread application of adjustment algorithms. In this paper, a Lagrangian particle tracking model is applied to the results of computational fluid dynamic simulations of the airflow field surrounding a rain gauge to derive a simple formulation of the collection efficiency curves as a function of wind speed. A new parameterization of the influence of rainfall intensity is proposed. The methodology was applied to a cylindrical gauge, which has the typical outer shape of tipping-bucket rain gauges, as a representative specimen of most operational measurement instruments. The wind velocity is the only ancillary variable required to calculate the adjustment, together with the measured rainfall intensity. Since wind is commonly measured by operational weather stations, its use adds no relevant burden to the cost of meteo-hydrological networks. View Full-Text
Keywords: rain; wind; CFD; particle tracking; drop size distribution; rainfall intensity; collection efficiency; adjustment curves rain; wind; CFD; particle tracking; drop size distribution; rainfall intensity; collection efficiency; adjustment curves
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MDPI and ACS Style

Cauteruccio, A.; Lanza, L.G. Parameterization of the Collection Efficiency of a Cylindrical Catching-Type Rain Gauge Based on Rainfall Intensity. Water 2020, 12, 3431. https://doi.org/10.3390/w12123431

AMA Style

Cauteruccio A, Lanza LG. Parameterization of the Collection Efficiency of a Cylindrical Catching-Type Rain Gauge Based on Rainfall Intensity. Water. 2020; 12(12):3431. https://doi.org/10.3390/w12123431

Chicago/Turabian Style

Cauteruccio, Arianna; Lanza, Luca G. 2020. "Parameterization of the Collection Efficiency of a Cylindrical Catching-Type Rain Gauge Based on Rainfall Intensity" Water 12, no. 12: 3431. https://doi.org/10.3390/w12123431

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