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CRC PUBLICATIONS |
A Model for Disaggregating Daily To Hourly Rainfalls For Design Flood Estimation
Walter Boughton
Publication Type:
Technical Report
This is a publication of the current CRC for Catchment Hydrology
CRC Program:
Climate Variability
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Publication Keywords:
Flood Forecasting
Rainfall-Runoff Relationship
Modelling (Hydrological)
Disaggregation
Precipitation (Atmospheric)
Design Data
Time Dependent
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Abstract / Summary:
The CRC Project FL1
Holistic approach to rainfall- based design flood estimation
,as its name suggests, investigated new ways to estimate design floods.The currently recommended procedure in Australia uses average values for the important input variables (eg rainfall intensity and temporal pattern, initial and continuous losses),rather than treating them as continuous variables which can interact one with another.
Project FL1 considered two approaches to incorporate parameter variability and interaction. The first evaluated the joint probability of key flood producing components to evaluate the probability distribution of the resultant design flood.The second used continuous rainfall-runoff modelling to produce long- synthetic sequences of runoff statistics. The latter included the development of a stochastic model to generate daily rainfalls.
This report addresses the task of producing
appropriate
patterns of hourly rainfalls for the generated daily values,a process termed
disaggregation
. For this, Walter Boughton has developed a procedure that has been applied to 28 Victorian pluviometer stations,and obtained good results for that region. Some additional testing of the methodology with a wider data set is underway, but we seek involvement and feedback from others to broaden experience of its application.
This report is available for downloading. Printed copies can be purchased from the Centre Office.
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Centre Office:
CRC for Catchment Hydrology
Dept of Civil Engineering
Building 60
Monash University Vic 3800
Tel: +61 3 9905 2704
Fax: +61 3 9905 5033
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