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Atmosphere 2018, 9(8), 287; https://doi.org/10.3390/atmos9080287

Rainfall Detection and Rainfall Rate Estimation Using Microwave Attenuation

1
Geo-Sciences Institute, Pukyong National University, 45, Yongso-Ro, Nam-Gu, Busan 48513, Korea
2
Department of Environmental Atmospheric Sciences, Pukyong National University, 45, Yongso-Ro, Nam-Gu, Busan 48513, Korea
*
Author to whom correspondence should be addressed.
Received: 8 February 2018 / Revised: 6 July 2018 / Accepted: 20 July 2018 / Published: 24 July 2018
(This article belongs to the Special Issue Precipitation: Measurement and Modeling)
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Abstract

Eight microwave links operating at frequencies ranging from 6 to 8 GHz and with path lengths ranging from 5.7 to 37.4 km traversing the city of Seoul, Korea are used to detect rainfall and estimate path-averaged rainfall rates. Rainfall detection using rain-induced attenuation (dB) was validated by rain detectors installed at automatic weather stations, and the results confirmed that microwave links can be used to detect rainfall with an accuracy ≥80%. The power-law R-k relationships between rain-induced specific attenuation, k (dB km−1), and the rainfall rate, R (mm h−1), were established and cross-validated by estimating the path-averaged rainfall rate. The mean bias of the path-averaged rainfall rate, as compared to the rainfall rate from ground rain gauges, was between −3 and 1 mm h−1. The improved accuracy of rainfall detection led to the improved accuracy of the path-averaged rainfall rate. Hence, it was confirmed that microwave links, used for broadcasting and media communications, can identify rainy or dry periods (rain spells or dry spells) in a way comparable to rain detectors and provide high time-resolution rainfall rates in real time. View Full-Text
Keywords: microwave link; attenuation; path-averaged rainfall rate estimate; rain detector; Inverse Distance Weighting microwave link; attenuation; path-averaged rainfall rate estimate; rain detector; Inverse Distance Weighting
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Kim, M.-S.; Kwon, B.H. Rainfall Detection and Rainfall Rate Estimation Using Microwave Attenuation. Atmosphere 2018, 9, 287.

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