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NexRad N1P data and Ground-based Rainfall Time Series Comparison in the Little Washita Watershed

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  2016 ASABE Annual International Meeting  162459110.(doi:10.13031/aim.20162459110)
Authors:   Congyu Hou, Maria L Chu, Jorge A Guzman
Keywords:   Comparison, Ground-based, NexRad, N1P, Rainfall, Time Series

Abstract. The rainfall time series recorded by NexRad (Next Generation Radar) and Ground-based stations was compared in terms of the sum of monthly rainfall, rain and no-rain probabilities, and rainfall events distribution in the Little Washita watershed in OK. The result showed that the NexRad has a tendency of recording the heavy and intense rainfall higher than the ground-based rainfall and the rainfall less than 2.54 mm as 0. NexRad has a tendency of recording higher rainfall when events have high intensity and long duration. As a result, the rainfall recorded in the months of March, April, May, June, and August are more close to the rainfall recorded from the ground-based station with the average different percentage of less than 25%. Rainfall recorded in the other months can easily be affected by extreme rainfall events and the difference is usually higher than 40%. These differences should be taken into consideration when deciding which datasets can best describe the processes to be modeled.

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