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A daily rainfall disaggregation model
Journal article   Peer reviewed

A daily rainfall disaggregation model

R D Connolly, J Schirmer and Peter K Dunn
Agricultural and Forest Meteorology, Vol.92(2), pp.105-117
1998
url
https://doi.org/10.1016/S0168-1923(98)00088-4View
Published Version

Abstract

Atmospheric Sciences rainfall intensity model infiltration runoff erosion
Short-time-intensity rainfall is often required in experimental and predictive studies of runoff, erosion and pollutant transport. While daily rainfall records of up to 100 years duration are commonly available in Australia, few short-time-intensity records of even 25 years duration have been maintained. In this paper, we describe and test a model that allows disaggregation of measured daily rainfall into short-time-intensity data. Parameters are derived from a relatively short, measured time-intensity record. The model simulates number of events on a rain day, and starting time, duration, rainfall amount, time to peak intensity and peak intensity of each event. A double exponential is used to generate internal intensity for each event. The model is relatively simple and can be parametrised with a measured time-intensity record as short as three years. The model adequately reproduced characteristics of rainfall from four locations in Australia with contrasting climates. The disaggregation model has application with simulation or experimental studies where information about the time distribution of rainfall is required. The model would be suitable for incorporation into cropping system and other models.

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Agronomy
Forestry
Meteorology & Atmospheric Sciences

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