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http://dx.doi.org/10.5467/JKESS.2013.34.1.13

The Adjustment of Radar Precipitation Estimation Based on the Kriging Method  

Kim, Kwang-Ho (Department of Environmental Atmospheric Sciences, Pukyong National University)
Kim, Min-seong (Department of Environmental Atmospheric Sciences, Pukyong National University)
Lee, Gyu-Won (Department of Astronomy and Atmospheric Sciences, Kyungpook National University)
Kang, Dong-Hwan (Geo-Sciences Institute, Pukyong National University)
Kwon, Byung-Hyuk (Department of Environmental Atmospheric Sciences, Pukyong National University)
Publication Information
Journal of the Korean earth science society / v.34, no.1, 2013 , pp. 13-27 More about this Journal
Abstract
Quantitative precipitation estimation (QPE) is one of the most important elements in meteorological and hydrological applications. In this study, we adjusted the QPE from an S-band weather radar based on co-kriging method using the geostatistical structure function of error distribution of radar rainrate. In order to estimate the accurate quantitative precipitation, the error of radar rainrate which is a primary variable of co-kriging was determined by the difference of rain rates from rain gauge and radar. Also, the gauge rainfield, a secondary variable of co-kriging is derived from the ordinary kriging based on raingauge network. The error distribution of radar rain rate was produced by co-kriging with the derived theoretical variogram determined by experimental variogram. The error of radar rain rate was then applied to the radar estimated precipitation field. Locally heavy rainfall case during 6-7 July 2009 is chosen to verify this study. Correlation between adjusted one-hour radar rainfall accumulation and rain gauge rainfall accumulation improved from 0.55 to 0.84 when compared to prior adjustment of radar error with the adjustment of root mean square error from 7.45 to 3.93 mm.
Keywords
variogram; kriging; co-kriging; radar rain rate; rain gauge;
Citations & Related Records
Times Cited By KSCI : 7  (Citation Analysis)
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