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Assessment of Climate Change Impact on IDF Curves: Case Study for Tehran- Iran

Author(s): S. Mehdi Malaekepour; Farhad Yazdandoost; Yaser Tahmasebi Birgani

Linked Author(s): Farhad Yazdandoost

Keywords: IDF curves; Climate change; Urban drainage systems; Climate models

Abstract: Typically, urban drainage systems are designed based on Intensity-Duration-Frequency (IDF) curves derived for each region. Inadequacies may prevail if urban engineers fail to take account of the impacts of climate change on IDF curves derivation processes. Therefore, there is a need to modify current IDF curves considering climate change. This paper presents a methodology to derive IDF curves under climate change for Tehran city (Iran) as a case study. In doing so, the output of climate model IPCM4 under B1 and A2 scenarios, are downscaled by Lars-WG model and IDF curves are then derived by empirical methods. Results indicate 15% and 5. 7% rise in IDF curves under B1 and A2 scenarios, respectively relative to base period. Presented methodology efficiently helps urban drainage system designers to incorporate future climate variability effects into their designs. This may in turn decrease the probability of urban drainage systems failure due to dramatic changes in climate conditions.


Year: 2013

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