Estimation of daily rainfall accumulations by merging radar and rain gauge data for near real-time use
Crossley A.L.
The Rainfall Network Collaboration Project (RCP) commenced on 12th June 2000 as a joint project between the Environment Agency and the Met Office. As part of the project, 400 sub-daily reporting rain gauges are to be made operational for the purpose of improving National Flood Forecasting. A requirement of RCP was to incorporate the new data in Nimrod and improve the existing Nimrod accumulation scheme. The following report details the testing and development of a radar - rain gauge rainfall estimation technique suitable for the purposes of Flood Forecasting. Five rainfall estimation techniques were developed, evaluated and compared; an existing Met Office Recursive Filter scheme, modified to be applied to radar - gauge merging, two statistical methods namely Kriging with External Drift and Cokriging of Log Rainfall values, the existing Nimrod accumulations estimations and the well documented Ordinary Kriging of rain gauges. Two case studies, in April 2000 and September-December 2000 were carried out using 24 hour rainfall accumulations. The ...
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