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Analysis of the Z-R relationship using X-Band weather radar measurements in the area of Athens

Pappa Athina, Bournas Apollon, Lagouvardos Konstantinos, Baltas Evangelos

Acta Geophysica

2021

Vol. 69, no. 4

1529--1543

This research work focuses on the investigation of the Z-R relationship impact on weather radar rainfall estimates, through the correlation of a X-Band weather radar estimates and rain gauge measurements in the region of Attica, Greece. The methodology followed in this work is performed into two sections, where frst, a framework is applied in order to access the raw rainscanner datasets and convert them into a compatible form for comparison, since the radar measurements consist of gridded refectivity values of 2-min temporal scale, whereas the rain gauge measurements pertain to 10-min point precipi tation measurements. Secondly, a statistical analysis is performed, regarding the spatial variability of the Z-R relationship for a single event. Specifcally, four Z-R relationships are used and compared based on the correlation with the actual rain gauge measurements, for each station, and the results are then shown upon the study area. The results provide with important fndings about the spatial distribution of the optimal Z-R relationship based upon the proximity of the stations to the weather radar location, the coastline and station elevation.