Extreme rainfall in Dakar (Senegal): a case study for September 5, 2020 DOI Creative Commons
Seynabou Mocote Diédhiou,

Manuel Rauch,

Abdou Lahat Dieng

et al.

Frontiers in Water, Journal Year: 2024, Volume and Issue: 6

Published: Nov. 20, 2024

West African countries frequently experience extreme rainfall events during the monsoon season. On September 5, 2020, a significant event occurred in Dakar region of Senegal with daily totals exceeding 90 mm, causing widespread flooding and displacing 1,000's people. Despite severity this event, physical mechanisms driving such remain unexplored. This study aims to investigate associated using multiple data sources, including satellite estimate products (GPM-IMERG, CHIRPS) reanalysis (ERA-5). By analyzing wind fields mid-tropospheric moisture content from data, we examined synoptic-dynamic evolution atmosphere movement cyclonic vortex that transported affected region, resulting substantial measurements 100 mm. The analysis also revealed over ocean slowed down near Senegal, prolonging total period 10 h. Additionally, presents comprehensive comparative state-of-the-art estimates, assessing their accuracy reliability capturing both spatially at specific gauges situated Dakar. evaluation while estimates are valuable, they tended underestimate (up 40%) actual observed Dakar-Yoff station. Furthermore, value showed there is tendency return levels for high-intensity events, some cases showing underestimations by up twice values. Thus, research advances our understanding Africa improves knowledge satellite-based contributing future monitoring preparedness. these findings highlight importance systems Easterly Waves, better Africa.

Language: Английский

Extreme rainfall in Dakar (Senegal): a case study for September 5, 2020 DOI Creative Commons
Seynabou Mocote Diédhiou,

Manuel Rauch,

Abdou Lahat Dieng

et al.

Frontiers in Water, Journal Year: 2024, Volume and Issue: 6

Published: Nov. 20, 2024

West African countries frequently experience extreme rainfall events during the monsoon season. On September 5, 2020, a significant event occurred in Dakar region of Senegal with daily totals exceeding 90 mm, causing widespread flooding and displacing 1,000's people. Despite severity this event, physical mechanisms driving such remain unexplored. This study aims to investigate associated using multiple data sources, including satellite estimate products (GPM-IMERG, CHIRPS) reanalysis (ERA-5). By analyzing wind fields mid-tropospheric moisture content from data, we examined synoptic-dynamic evolution atmosphere movement cyclonic vortex that transported affected region, resulting substantial measurements 100 mm. The analysis also revealed over ocean slowed down near Senegal, prolonging total period 10 h. Additionally, presents comprehensive comparative state-of-the-art estimates, assessing their accuracy reliability capturing both spatially at specific gauges situated Dakar. evaluation while estimates are valuable, they tended underestimate (up 40%) actual observed Dakar-Yoff station. Furthermore, value showed there is tendency return levels for high-intensity events, some cases showing underestimations by up twice values. Thus, research advances our understanding Africa improves knowledge satellite-based contributing future monitoring preparedness. these findings highlight importance systems Easterly Waves, better Africa.

Language: Английский

Citations

1