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Variability in episodic precipitation concentration in the Asian megacity of Dhaka, Bangladesh
Changes in episodic and extreme rainfall events are the prime concern for waterlogging issues in major Asian cities such as Dhaka, Bangladesh. The present study analyzed the characteristics of episodic and non-episodic rainfall and their trend over the 1976–2015 period in Dhaka, Bangladesh. The stud...
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| Published in: | Meteorology and atmospheric physics 2023-12, Vol.135 (6), p.57, Article 57 |
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| container_title | Meteorology and atmospheric physics |
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| creator | Mondol, Md Anarul Haque Habib, Md Ashraful Kabir, Faria Islam, Abu Reza Md. Towfiqul Rahman, Md Zakiur Kamruzzaman, Mohammad Siddiki, Ubaydur Rahaman |
| description | Changes in episodic and extreme rainfall events are the prime concern for waterlogging issues in major Asian cities such as Dhaka, Bangladesh. The present study analyzed the characteristics of episodic and non-episodic rainfall and their trend over the 1976–2015 period in Dhaka, Bangladesh. The study used the daily rainfall data of the Dhaka meteorological station of Bangladesh to estimate episodic and non-episodic rainfall events, seasonal and annual precipitation concentrations. The Mann-Kendal Test and Sen’s slope were used to calculate rainfall trends over the study period. Results indicate that the monsoon rainfall has increased, whereas the annual rainfall has decreased. Results suggest that seasonal daily average and total rainfall have decreased, except for monsoon, which is insignificant. However, the number of post-monsoon rainfall days is increasing. In addition, the number of episodes and episodic rainfall has increased during the monsoon and post-monsoon, although these are not statistically significant. Episodic rainfall has a strong positive relationship with extreme rainfall events, although the number of extreme rainfall events has decreased. The study noticed substantial irregularities in precipitation concentration during the winter and post-monsoon periods, while the monsoon has an almost uniform precipitation concentration. This research found that episodic rainfall had inter-annual variability before the 2000s, whereas decadal variability was detected in recent decades. This study could help policymakers better understand the characteristics of rainfall patterns and their contribution to waterlogging in similar areas of Bangladesh and elsewhere. |
| doi_str_mv | 10.1007/s00703-023-00995-w |
| format | article |
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| subjects | Annual precipitation Annual rainfall Annual variations Aquatic Pollution Atmospheric Sciences Daily rainfall Earth and Environmental Science Earth Sciences Extreme values Extreme weather Hydrologic data Interannual variability Math. Appl. in Environmental Science Megacities Meteorology Monsoon rainfall Monsoons Original Paper Precipitation Rainfall data Rainfall patterns Rainfall trends Statistical analysis Terrestrial Pollution Waste Water Technology Water Management Water Pollution Control Waterlogging Weather stations Wind |
| title | Variability in episodic precipitation concentration in the Asian megacity of Dhaka, Bangladesh |
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