Evaluate the performance of urban runoff collection network in semi-arid areas affected by climate change

Document Type : Research Article

Authors

1 PhD student in Watershed Science and Engineering, Kashan University

2 Professor, Faculty of Natural Resources and Earth Sciences, Kashan University

3 Associate Professor, Faculty of Natural Resources and Earth Sciences, Kashan University

Abstract

The purpose of the current research is to evaluate the performance of the drainage network and flood control nodes in the base period (1980-2020) and under the influence of climate change for 25 and 50-year return periods in the central part of Tehran's sixth district. The results of calibration and validation of the model showed a good fit between the observational data and the simulation. So that the value of coefficient (NS) in the calibration stage for the first to third event is 0.77, 0.72 and 0.64 respectively and this coefficient was obtained in the validation stage for two events, 0.72 and 0.70, respectively. the drainage network was evaluated for the return period of 25 and 50 years for the base period and under the influence of climate change. The results showed that with the increase of the return period in the base period and in the future, there is overflow and flooding in some flood channels and nodes of the drainage network, so that the number of flood nodes in the base period (1980-2020) and under the influence of climate change scenario RCP2.6 and RCP8.5(2021-2050) for the 25-year return period is 10, 13 and 15 respectively. The number of flood nodes in the base period (1980-2020) and under the influence of climate change scenario RCP2.6 and RCP8.5(2051-2100) for the 50-year return period are 12, 17 and 19, respectively. Increasing the dimensions of channels and implementing methods (LID) is an operational solution to solve the problem of elevation.

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Main Subjects

References

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Iranian journal of Ecohydrology
Volume 9, Issue 4
January 2023
Pages 783-795

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History

  • Receive Date: 18 May 2022
  • Revise Date: 19 August 2022
  • Accept Date: 19 December 2022
  • First Publish Date: 19 December 2022
  • Publish Date: 22 December 2022

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