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

Rana, Arun LU ; Bengtsson, Lars LU ; Olsson, L. and Jothiprakash, V. (2013) In Hydrology and Earth System Sciences Discussions 10(4). p.4709-4738
Abstract
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... (More)
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. (Less)
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organization
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type
Contribution to journal
publication status
published
subject
in
Hydrology and Earth System Sciences Discussions
volume
10
issue
4
pages
4709 - 4738
publisher
Copernicus Gesellschaft Mbh
ISSN
1812-2108
DOI
10.5194/hessd-10-4709-2013
language
English
LU publication?
yes
id
7c3fb8a7-2bdf-44f9-9876-60c8c198b0e1 (old id 8052640)
date added to LUP
2015-10-07 11:00:30
date last changed
2016-04-16 11:23:10
@misc{7c3fb8a7-2bdf-44f9-9876-60c8c198b0e1,
  abstract     = {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.},
  author       = {Rana, Arun and Bengtsson, Lars and Olsson, L. and Jothiprakash, V.},
  issn         = {1812-2108},
  language     = {eng},
  number       = {4},
  pages        = {4709--4738},
  publisher    = {ARRAY(0xa2b8270)},
  series       = {Hydrology and Earth System Sciences Discussions},
  title        = {Development of IDF-curves for tropical india by random cascade modeling},
  url          = {http://dx.doi.org/10.5194/hessd-10-4709-2013},
  volume       = {10},
  year         = {2013},
}