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http://dx.doi.org/10.12652/Ksce.2014.34.5.1455

Outlier Detection and Replacement for Vertical Wind Speed in the Measurement of Actual Evapotranspiration  

Park, Chun Gun (Kyonggi University)
Rim, Chang-Soo (Kyonggi University)
Lim, Kwang-Suop (K-water)
Chae, Hyo-Sok (K-water)
Publication Information
KSCE Journal of Civil and Environmental Engineering Research / v.34, no.5, 2014 , pp. 1455-1461 More about this Journal
Abstract
In this study, using flux data measured in Deokgokje reservoir watershed near Deokyu mountain in May, June, and July 2011, statistical analysis was conducted for outlier detection and replacement for vertical wind speed in the measurement of evapotranspiration based on eddy covariance method. To statistically analyze the outliers of vertical wind speed, the outlier detection method based on interquartile range (IQR) in boxplot was employed and the detected outliers were deleted or replaced with mean. The comparison was conducted for the measured evapotranspiration before and after the outlier replacement. The study results showed that there is a difference between evapotranspiration before outlier replacement and evapotranspiration after outlier replacement, especially during the rainy day. Therefore, based on the study results, the outliers should be deleted or replaced in the measurement of evapotranspiration.
Keywords
Latent heat flux; Outliers; Eddy covariance; Statistical analysis; IQR rule;
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Times Cited By KSCI : 6  (Citation Analysis)
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