FREQUENCY ANALYSIS OF ANNUAL MAXIMUM DAILY RAINFALL IN WADI ALAQIQ, SAUDI ARABIA

Authors

  • Norhan Abd Rahman Department of Hydraulics and Hydrology, Faculty of Civil Engineering, Universiti Teknologi Malaysia, 81310 Johor Bahru, Johor, Malaysia
  • Fahad Alahmadi Madinah Water Directorate, Madinah, Kingdom of Saudi Arabia
  • Zekai Sen Istanbul Technical University, ITU, Istanbul, Turkey
  • Saud Taher Department of Civil Engineering, College of Engineering, Taibah University, Madinah, Saudi Arabia

DOI:

https://doi.org/10.11113/mjce.v28.15973

Keywords:

Statistical frequency, annual maximum daily rainfall, goodness of fit tests, probability density function, climate change effects, Wadi Alaqiq.

Abstract

In arid regions the rainfall is highly variable temporally and spatially. Statistical frequency analyses help to extract design rainfall intensity for different return periods. Wadi Alaqiq catchment at Madinah region in the Kingdom of Saudi Arabia is selected to estimate the frequency of the daily rainfall, where there are two rainfall stations (Madinah and BirMashi) with more than 40-year annual maximum daily rainfall magnitudes. Several probability distribution functions are tested through goodness-of-fit (GOF). Anderson-Darling (AD) test is applied to select the best statistical distribution and L-moments method is applied for parameters estimation. The generalized logistic and generalized extreme value PDFs are the best for this arid region data for both stations. The findings are useful for application of flood frequency analysis in arid region with similar conditions of hydrological systems. In the mean-time, the climate change effects have been explained through the innovative trend analysis.

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2018-07-16

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FREQUENCY ANALYSIS OF ANNUAL MAXIMUM DAILY RAINFALL IN WADI ALAQIQ, SAUDI ARABIA. (2018). Malaysian Journal of Civil Engineering, 28(2). https://doi.org/10.11113/mjce.v28.15973