Chapter
Apr 26, 2012
Statistical Analysis of Extreme Rainfall Events over Indiana, USA
Authors: Shih-Chieh Kao [email protected] and Rao S. Govindaraju [email protected]Author Affiliations
Publication: World Environmental and Water Resources Congress 2007: Restoring Our Natural Habitat
Abstract
Analysis of extreme rainfall events is important for hydraulic and hydrologic studies, and has conventionally been performed by pre-specifying rainfall duration as a filter to abstract the information of annual maximum rainfall depths for further examination. However, this single-variate approach does not account for dependence between rainfall properties. To characterize extreme rainfall events, a multi-variate analysis is conducted in this study using hourly precipitation data from Indiana, USA. Samples of extreme rainfall events are chosen based on two different criteria: annual maximum volume, and annual maximum peak intensity. Rainfall properties, such as total depth, duration, and peak intensity are analyzed using copulas to describe the dependence structures between rainfall variables and to construct their joint distribution for extreme rainfall events. Results from the derived multivariate model are compared to those from conventional single-variate analysis by computing the corresponding conditional distributions. The proposed stochastic model for extreme rainfall is expected to provide better estimates of design rainfall.
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© 2007 American Society of Civil Engineers.
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Published online: Apr 26, 2012
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School of Civil Engineering, Purdue University, West Lafayette, IN 47907. E-mail: [email protected]
School of Civil Engineering, Purdue University, West Lafayette, IN 47907. E-mail: [email protected]
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