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CRC PUBLICATIONS |
A Daily Rainfall Generating Model For Water Yield and Flood Studies
Walter Boughton
Publication Type:
Technical Report
This is a publication of the initial CRC for Catchment Hydrology
CRC Program:
Flood Hydrology (Previous CRC)
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Publication Keywords:
Rainfall/Runoff Relationship
Modelling (Hydrological)
Precipitation (Atmospheric)
Floods and Flooding
Frequency Analysis
Design Data
Forecasting
Water Yields
Catchment Areas
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Abstract / Summary:
Abstract
Daily rainfall records form a major hydrological data base in Australia, but the common 50-100 years of available record at a station do not give adequate information about long term risks of droughts or floods. Transition Probability Matrix models have been used in prior studies to generate long sequences of daily rainfalls, but the model most commonly used in Australia seriously under-estimates the variance of annual totals of rainfall. An extension of the basic TPM model is made to incorporate a variance adjustment parameter which enables easy calibration of the model to match the frequency distribution of annual totals in the available record.
Annual maxima daily rainfalls are calibrated against estimates of 24-hour Probable Maximum Precipitation or similar daily rainfalls with a long average recurrence interval. The model is programmed for simple calibration of the 2 parameters and use on a personal computer.
This report is available for downloading. The report 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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