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Assessment of climate change impacts on rainfall using large scale climate variables and downscaling models – A case study

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Abstract

Many of the applied techniques in water resources management can be directly or indirectly influenced by hydro-climatology predictions. In recent decades, utilizing the large scale climate variables as predictors of hydrological phenomena and downscaling numerical weather ensemble forecasts has revolutionized the long-lead predictions. In this study, two types of rainfall prediction models are developed to predict the rainfall of the Zayandehrood dam basin located in the central part of Iran. The first seasonal model is based on large scale climate signals data around the world. In order to determine the inputs of the seasonal rainfall prediction model, the correlation coefficient analysis and the new Gamma Test (GT) method are utilized. Comparison of modelling results shows that the Gamma test method improves the Nash–Sutcliffe efficiency coefficient of modelling performance as 8% and 10% for dry and wet seasons, respectively. In this study, Support Vector Machine (SVM) model for predicting rainfall in the region has been used and its results are compared with the benchmark models such as K-nearest neighbours (KNN) and Artificial Neural Network (ANN). The results show better performance of the SVM model at testing stage. In the second model, statistical downscaling model (SDSM) as a popular downscaling tool has been used. In this model, using the outputs from GCM, the rainfall of Zayandehrood dam is projected under two climate change scenarios. Most effective variables have been identified among 26 predictor variables. Comparison of the results of the two models shows that the developed SVM model has lesser errors in monthly rainfall estimation. The results show that the rainfall in the future wet periods are more than historical values and it is lower than historical values in the dry periods. The highest monthly uncertainty of future rainfall occurs in March and the lowest in July.

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Authors and Affiliations

  1. Department of Civil Engineering, Isfahan University of Technology, Isfahan, Iran

    Azadeh Ahmadi

  2. Abbaspour College of Technology, Shahid Beheshti University, Tehran, Iran

    Ali Moridi

  3. Department of Watershed Management Engineering, Faculty of Natural Resources and Marine Sciences, Tarbiat Modares University, Noor, Iran

    Elham Kakaei Lafdani

  4. Department of Civil Engineering, Isfahan University of Technology, Isfahan, Iran

    Ghasem Kianpisheh

Authors
  1. Azadeh Ahmadi
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  2. Ali Moridi
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  3. Elham Kakaei Lafdani
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  4. Ghasem Kianpisheh
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Correspondence to Azadeh Ahmadi.

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Ahmadi, A., Moridi, A., Lafdani, E.K. et al. Assessment of climate change impacts on rainfall using large scale climate variables and downscaling models – A case study. J Earth Syst Sci 123, 1603–1618 (2014). https://doi.org/10.1007/s12040-014-0497-x

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  • DOI: https://doi.org/10.1007/s12040-014-0497-x

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