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Development of Idf-curves for Tropical India by Random Cascade Modeling : Volume 10, Issue 4 (11/04/2013)

By Rana, A.

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Book Id: WPLBN0004011735
Format Type: PDF Article :
File Size: Pages 30
Reproduction Date: 2015

Title: Development of Idf-curves for Tropical India by Random Cascade Modeling : Volume 10, Issue 4 (11/04/2013)  
Author: Rana, A.
Volume: Vol. 10, Issue 4
Language: English
Subject: Science, Hydrology, Earth
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2013
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Jothiprakash, V., Bengtsson, L., Olsson, J., & Rana, A. (2013). Development of Idf-curves for Tropical India by Random Cascade Modeling : Volume 10, Issue 4 (11/04/2013). Retrieved from http://hawaiilibrary.net/


Description
Description: Department of Water Resources Engineering, Lund University, P.O. Box 118, Lund, 22100, Sweden. Efficient design of urban drainage systems is based on statistical analysis of past rainfall events at fine time scales. However, fine time scale rainfall data are usually lacking in many parts of the world. A possible way forward is to develop methods to derive fine time scale rain intensities from daily observations. This paper applied cascade-based disaggregation modeling for generation of fine time scale rainfall data for Mumbai, India from daily rainfall data. These data were disaggregated to 10-min values. The model was used to disaggregate daily data for the period 1951–2004 and develop intensity-duration-frequency (IDF) relationships. This disaggregation technique is commonly used assuming scale-invariance using constant parameters. For the Mumbai rains it was found better to use parameters dependent on time scale and rain volume. Very good agreement between modeled and observed disaggregation series was found for the time scales larger than 1/2 h for the 1/2-yr period when short term data were available. Although the parameters were allowed to change with time scale, the rain intensities of duration shorter than 1/2 h were overestimated. When IDF-curves had been established, they showed that the current design standard for Mumbai city, 25 mm h−1, has a return period of less than one year. Thus, annual recurring flooding problems in Mumbai appear evident.

Summary
Development of IDF-curves for tropical india by random cascade modeling

Excerpt
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