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Disaggregating radar-derived rainfall measurements in East Azarbaijan, Iran, using a spatial random-cascade model

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Abstract

The availability of spatial, high-resolution rainfall data is one of the most essential needs in the study of water resources. These data are extremely valuable in providing flood awareness for dense urban and industrial areas. The first part of this paper applies an optimization-based method to the calibration of radar data based on ground rainfall gauges. Then, the climatological Z-R relationship for the Sahand radar, located in the East Azarbaijan province of Iran, with the help of three adjacent rainfall stations, is obtained. The new climatological Z-R relationship with a power-law form shows acceptable statistical performance, making it suitable for radar-rainfall estimation by the Sahand radar outputs. The second part of the study develops a new heterogeneous random-cascade model for spatially disaggregating the rainfall data resulting from the power-law model. This model is applied to the radar-rainfall image data to disaggregate rainfall data with coverage area of 512 × 512 km2 to a resolution of 32 × 32 km2. Results show that the proposed model has a good ability to disaggregate rainfall data, which may lead to improvement in precipitation forecasting, and ultimately better water-resources management in this arid region, including Urmia Lake.

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Acknowledgments

The authors would like to thank the Meteorological Department of East Azarbaijan, Iran, for providing gauge and radar-rainfall data and the East Azarbaijan Regional Water Company for funding the research. We would also like to acknowledge Prof. Vahid Nourani (University of Tabriz), Jory Hecht (Tufts University), Javad Fouladi (University of Tabriz), and Corrie Thies (University of California at Irvine) for their useful suggestions to improve the quality of the research presented in this manuscript.

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Correspondence to Mahdi Zarghami.

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Fouladi Osgouei, H., Zarghami, M. & Ashouri, H. Disaggregating radar-derived rainfall measurements in East Azarbaijan, Iran, using a spatial random-cascade model. Theor Appl Climatol 129, 427–435 (2017). https://doi.org/10.1007/s00704-016-1784-z

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