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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Bibliographic Details
Published in:Meteorology and atmospheric physics 2023-12, Vol.135 (6), p.57, Article 57
Main Authors: Mondol, Md Anarul Haque, Habib, Md Ashraful, Kabir, Faria, Islam, Abu Reza Md. Towfiqul, Rahman, Md Zakiur, Kamruzzaman, Mohammad, Siddiki, Ubaydur Rahaman
Format: Article
Language:English
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
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Summary: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.
ISSN:0177-7971
1436-5065
DOI:10.1007/s00703-023-00995-w