Abstract
The southern region of Bangladesh is more unstable than the other part of the country due to massive discharge of heavy sediment through the Meghna estuary. Discussions regarding shoreline representation are critical to regulate the dynamic nature of the coast. This study focuses on measuring the shoreline change, evaluating the LULC (land use & land cover) due to shoreline dynamics utilising multi-dated (1978–2018) satellite images, and changes in the social-economic condition by a direct interview-based questionnaire survey of Nijhum Dwip, Hatiya, Noakhali, Bangladesh. This study assessed shoreline transition through shoreline movement (NSM), endpoint rate (EPR), and prediction based on the EPR rate. 104% of the shore area was increased by -17 m to 86 m annually. Most of the accretion emerged on the Northern and Western sides; erosion only transpired on the Southern side. The shoreline was also projected to increase by 2.2 km, with 644.32 hectares in the study area by 2028. LULC mainly changed due to erosion-accretion activities in the study area. In accreted land, barren land, mudflats, homestead vegetation, and grassland were increased by 15.51 ha, 17.19 ha, 689.68 ha, and 578.17 ha, respectively, where the succession process formed the grassy beach. In contrast, cropland, green, and mangrove vegetation decreased by 12%, 9%, and 0.11%, drastically in its total area, although they had increased in accreted land. It was appraised that the vegetated area will raise 5103.39 hectares by 2028. Thus it was also determined that shoreline change positively impacted migration, economic activities, and tourism. As newly accreted land was cheap or could stay through "Bndobostho." People joined various working fields created in newly accreted land, as farmers increased by 7%. Moreover, about 83% of tourists increased due to shoreline expansion. Finally, this paper intends to contribute several suggestions to the socio-economic development of native people and future strategic management of the reserved coastal area.
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All the secondary data were collected from BWDB and USGS.
Notes
The Landless get special land leases or incentives from government.
A house with walls made of bamboo, mud, grass, reed, thatch, straw, leaves, and unburned bricks occasionally corrugated iron sheets as roofs.
Closely houses made of jute sticks, tree leaves, jute sacks.
A house constructed out of heavy materials like stone, brick, cement, concrete, or wood.
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MBS were involved in planning and supervising the work. PC performed the measurements, processed the experimental data, performed the analysis, drafted the manuscript and designed the figures. Also, PC aided in interpreting the results and worked on the manuscript, and MBS revised it critically. Finally, all the authors approved this final version.
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This study received ethical approval from the head and all the other faculty members from department of Geography and Environment, Shahjalal University of Science and Technology, Sylhet, Bangladesh.
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Author Md. Bahuddin Sikder is Assistant Professor of Department of Geography and Environment, Shahjalal University of Science and Technology, Sylhet -3114, Bangladesh and receives no compensation as faculty member of Department of Geography and Environment, Shahjalal University of Science and Technology, Sylhet -3114, Bangladesh.
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Chowdhury, P., Sikder, M.B. Shoreline dynamics in the reserved region of meghna estuary and its impact on lulc and socio-economic conditions: a case study from nijhum dwip, Bangladesh. J Coast Conserv 28, 1 (2024). https://doi.org/10.1007/s11852-023-01000-7
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DOI: https://doi.org/10.1007/s11852-023-01000-7