Estimation of radar-rainfall error spatial correlation.

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Estimation of radar-rainfall error spatial correlation.

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dc.contributor.author Mandapaka, Pradeep V.
dc.contributor.author Krajewski, Witold F.
dc.contributor.author Ciach, Grzegorz J.
dc.contributor.author Villarini, Gabriele.
dc.contributor.author Smith, James A.
dc.date.accessioned 2012-07-24T01:02:23Z
dc.date.available 2012-07-24T01:02:23Z
dc.date.copyright 2008
dc.date.issued 2012-07-24
dc.identifier.citation Mandapaka, P. V., Krajewski, W. F., Ciach, G. J., Villarini, G., & Smith, J. A. (2008). Estimation of Radar-rainfall Error Spatial Correlation. Advances in Water Resources, 32(7), 1020–1030.
dc.identifier.uri http://hdl.handle.net/10220/8337
dc.description.abstract The study presents a theoretical framework for estimating the radar-rainfall error spatial correlation (ESC) using data from relatively dense rain gauge networks. The error is defined as the difference between the radar estimate and the corresponding true areal rainfall. The method is analogous to the error variance separation that corrects the error variance of a radar-rainfall product for gauge representativeness errors. The study demonstrates the necessity to consider the area–point uncertainties while estimating the spatial correlation structure in the radar-rainfall errors. To validate the method, the authors conduct a Monte Carlo simulation experiment with synthetic fields with known error spatial correlation structure. These tests reveal that the proposed method, which accounts for the area–point distortions in the estimation of radar-rainfall ESC, performs very effectively. The authors then apply the method to estimate the ESC of the National Weather Service’s standard hourly radar-rainfall products, known as digital precipitation arrays (DPA). Data from the Oklahoma Micronet rain gauge network (with the grid step of about 5 km) are used as the ground reference for the DPAs. This application shows that the radar-rainfall errors are spatially correlated with a correlation distance of about 20 km. The results also demonstrate that the spatial correlations of radar–gauge differences are considerably underestimated, especially at small distances, as the area–point uncertainties are ignored.
dc.language.iso en
dc.relation.ispartofseries Advances in water resources
dc.rights © 2008 Elsevier. This is the author created version of a work that has been peer reviewed and accepted for publication by Advances in Water Resources, Elsevier. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: DOI [http://dx.doi.org/10.1016/j.advwatres.2008.08.014].
dc.subject DRNTU::Engineering::Civil engineering::Water resources.
dc.title Estimation of radar-rainfall error spatial correlation.
dc.type Journal Article
dc.identifier.doi http://dx.doi.org/10.1016/j.advwatres.2008.08.014
dc.description.version Accepted version

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