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Comparative Analyses on Disaggregation Methods for the Rainfall Projection

Author

Listed:
  • Wan Amirul Syahmi Wan Mazlan

    (Universiti Malaysia Pahang, Lebuhraya Persiaran Tun Khalil Yaakob)

  • Nurul Nadrah Aqilah Tukimat

    (Universiti Malaysia Pahang, Lebuhraya Persiaran Tun Khalil Yaakob)

Abstract

Climate modeling data are typically available in the daily climate time series for a particular year of observation. However, studies for urban drainage and stormwater management require rainfall data on sub-daily time scales for design such as the development of IDF curves. Most hydrological studies dealing with the impacts of climate change are particularly challenging due to this explicit requirement. Therefore, this study aims to establish more accurate disaggregation methods for constructing hourly rainfall under the projected climate scenarios. Three disaggregation methods with different theoretical underpinnings have been evaluated: Scaling Properties (SP), Indian Reduction Formula (IRF), and Stochastic Method (SM). The results show that the SP method generally outperforms the other methods based on statistical analyses and comparisons of statistical properties with historical data. The SP method performs well by having the lowest RMSE and percentage difference values across all rainfall stations. Moreover, the hourly mean and standard deviation of disaggregated rainfall from the SP method correspond well to the historical data. The projected rainfall data from 2025 to 2100 were obtained from the MRI-ESM2-0 model and disaggregated from daily-time to hourly-time series using the SP method. In general, the SSP5-8.5 scenario showed the highest projected rainfall compared with the other scenarios.

Suggested Citation

  • Wan Amirul Syahmi Wan Mazlan & Nurul Nadrah Aqilah Tukimat, 2023. "Comparative Analyses on Disaggregation Methods for the Rainfall Projection," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 37(10), pages 4195-4209, August.
    • Handle: RePEc:spr:waterr:v:37:y:2023:i:10:d:10.1007_s11269-023-03546-5
    DOI: 10.1007/s11269-023-03546-5
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    References listed on IDEAS

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    1. Saeid Soltani & Razi Helfi & Parisa Almasi & Reza Modarres, 2017. "Regionalization of Rainfall Intensity-Duration-Frequency using a Simple Scaling Model," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 31(13), pages 4253-4273, October.
    2. Muhammad Saiful Adham Shukor & Zulkifli Yusop & Fadhillah Yusof & Zulfaqar Sa’adi & Nor Eliza Alias, 2020. "Detecting Rainfall Trend and Development of Future Intensity Duration Frequency (IDF) Curve for the State of Kelantan," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 34(10), pages 3165-3182, August.
    3. Majid Galoie & Fouad Kilanehei & Artemis Motamedi & Mohammad Nazari-Sharabian, 2021. "Converting Daily Rainfall Data to Sub-daily—Introducing the MIMD Method," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 35(11), pages 3861-3871, September.
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