A geospatial assessment of flood hazard in north‐eastern depressed basin, Bangladesh

Datos Bibliográficos

ID20153259
AutoresMohammad Abdul Quader (0000-0002-8176-3856, Department of Geography and Environment Jagannath University Dhaka Bangladesh, autor de correspondencia), Hemal Dey (0000-0002-7227-9579, Department of Geography and Environment Jagannath University Dhaka Bangladesh), Abdul Malak (Department of Geography and Environment Jagannath University Dhaka Bangladesh), Zakiur Rahman (0000-0002-8208-6164, Department of Geography and Environmental Science Begum Rokeya University Rangpur Bangladesh)
Año2023
Volumen44
Número2
Páginas277-299
Fecha de publicación2023-05-01
Peer ReviewedSí
Open AccessSí
TipoARTICLE
RevistaSingapore Journal of Tropical Geography (JOURNAL)
Identificadores de la revistaISSN: 0129-7619 • E-ISSN: 1467-9493
EditorialWiley (PUBLISHER • GB)
DOI10.1111/sjtg.12476
OpenAlexW4320729940
IdiomaEN
Citas recibidas3
Referencias citadas53

Floods are a frequently occurring calamity in deltaic Bangladesh. This paper aims to assess the temporal expansion of waterbodies during flooding using geospatial techniques. Several water indices were applied to classify the satellite images at various temporal scales. Among them, the Normalized Difference Water Index (NDWI) showed the highest correlation ( r = 0.831; where p = 0.01) with rainfall data. Specifically, the NDWI results showed that perennial waterbodies measured 37 km 2 and 60 km 2 in Sunamganj District in 2017 and 2019, respectively. The area of waterbodies notably increased 52‐fold from March to April (37 km 2 to 1958 km 2 ) during the pre‐monsoon flash flood of 2017. During the July 2019 monsoon flood, waterbodies started to extend after May and flooded 2784 km 2 in area. NDVI analysis showed that in 2019, floodwater submerged 361.7 km 2 of vegetation cover. At the same time, the Surma River's flooding resulted in a 73.9 per cent inundation of the total area of the Sunamganj District. We hope that this study will provide better understanding of the varying nature of floods that occur in the low lying bowl shaped Haor region which will in turn assist the government with flood mitigation

Cartography · Climate change · Flash flood · Flood myth · Flooding (psychology) · Geography · Geomorphology · Geospatial analysis · Hydrology (agriculture) · Meteorology · Monsoon · Normalized Difference Vegetation Index · Physical geography · Structural basin · Environmental Science · Flood Risk Assessment and Management · Geology · Groundwater and Watershed Analysis · Oceanography · Tropical and Extratropical Cyclones Research