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Characterization of Peak Flow Events with Local Singularity Method : Volume 16, Issue 4 (22/07/2009)

By Cheng, Q.

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Book Id: WPLBN0003976039
Format Type: PDF Article :
File Size: Pages 11
Reproduction Date: 2015

Title: Characterization of Peak Flow Events with Local Singularity Method : Volume 16, Issue 4 (22/07/2009)  
Author: Cheng, Q.
Volume: Vol. 16, Issue 4
Language: English
Subject: Science, Nonlinear, Processes
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2009
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Wang, L., Li, L., & Cheng, Q. (2009). Characterization of Peak Flow Events with Local Singularity Method : Volume 16, Issue 4 (22/07/2009). Retrieved from http://www.worldebookfair.com/


Description
Description: State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan, Beijing, China. Three methods, return period, power-law frequency plot (concentration-area) and local singularity index, are introduced in the paper for characterizing peak flow events from river flow data for the past 100 years from 1900 to 2000 recorded at 25 selected gauging stations on rivers in the Oak Ridges Moraine (ORM) area, Canada. First a traditional method, return period, was applied to the maximum annual river flow data. Whereas the Pearson III distribution generally fits the values, a power-law frequency plot (C-A) on the basis of self-similarity principle provides an effective mean for distinguishing extremely large flow events from the regular flow events. While the latter show a power-law distribution, about 10 large flow events manifest departure from the power-law distribution and these flow events can be classified into a separate group most of which are related to flood events. It is shown that the relation between the average water releases over a time period after flow peak and the time duration may follow a power-law distribution. The exponent of the power-law or singularity index estimated from this power-law relation may be used to characterize non-linearity of peak flow recessions. Viewing large peak flow events or floods as singular processes can anticipate the application of power-law models not only for characterizing the frequency distribution of peak flow events, for example, power-law relation between the number and size of floods, but also for describing local singularity of processes such as power-law relation between the amount of water released versus releasing time. With the introduction and validation of singularity of peak flow events, alternative power-law models can be used to depict the recession property as well as other types of non-linear properties.

Summary
Characterization of peak flow events with local singularity method

Excerpt
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