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You are here : eLibrary : IAHR World Congress Proceedings : 34th Congress - Brisbane (2011) : THEME 1: Extremes and Variability : Continuous simulation of rainfall at ungauged locations – a non-parametric disaggregation approach
Continuous simulation of rainfall at ungauged locations – a non-parametric disaggregation approach
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Continuous simulation of extended rainfall sequences is becoming an increasingly important tool in rainfall-runoff modelling and design flood estimation. Recently, a nonparametric approach was developed in which continuous (sub-daily) rainfall fragments are conditioned to daily rainfall on the current day and the rainfall state (wet or dry) on adjacent days using a k-nearest neighbour conditional resampling algorithm. A limitation of this approach is that extended pluviograph records at the location of interest are required, limiting applicability to only a small number of locations across Australia where such records are available. In this paper we present a generalisation to the above approach in which sub-daily rainfall fragments can be drawn from a set of ‘nearby’ stations, with distance defined by latitude, longitude, distance to coast and elevation. This method performs well in simulating both Intensity-Frequency-Duration characteristics and antecedent moisture, and thus provides a framework for simulating continuous rainfall sequences at any location in Australia, provided long daily sequences are available or can be generated.
File Size : 479,683 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 34th Congress - Brisbane (2011)
Article : THEME 1: Extremes and Variability
Date Published : 08/08/2012
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