Characteristics of intense rainfall over Gujarat State (India) based on percentile criteria |
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| Authors: | Hiren Dave James M E |
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| Institution: | Department of Physics, University School of Sciences, Gujarat University, Ahmedabad, Gujarat, India |
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| Abstract: | The study focuses on the spatial and temporal variations of intense/extreme rainfall events over Gujarat State (India) during the period 1970–2014. Average monsoon rainfall for the state shows a significant increasing trend, with an increase of 48 mm/decade. Some of the stations in the Saurashtra region show a statistically significant increasing trend but none of the stations in the state show a decreasing trend. The increasing trend in monsoon rainfall is very significant for the past three decades, with an increase of 167 mm/decade. Instead of fixed absolute threshold values, relative threshold values of rainfall corresponding to the 95th, 98th, 99th and 99.5th percentiles for each station have been proposed to represent heavy, very heavy, intense and extreme rainfall, which varied between 70–120, 105–160, 130–210 and 165–280 mm, respectively. Significant increasing trends are observed for the frequency of heavy and very heavy rainfall events over the state. |
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| Keywords: | temporal variation in rainfall percentile thresholds intense and extreme rainfall trends in monsoon rainfall Mann-Kendall trend test |
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