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首页> 外文期刊>International journal of earth sciences: Geologische Rundschau >Modeling metamorphosis of the Old Brahmaputra River and associated impacts on landscapes in the Central Bengal Basin, Bangladesh
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Modeling metamorphosis of the Old Brahmaputra River and associated impacts on landscapes in the Central Bengal Basin, Bangladesh

机译：Modeling metamorphosis of the Old Brahmaputra River and associated impacts on landscapes in the Central Bengal Basin, Bangladesh

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This study explores causal mechanisms of river metamorphosis and its impacts on regional landscapes. The study alsoinvestigates the implications of metamorphosis on associated ecological resources. Advanced GIS and remote sensing technologieswere used to delineate morphological parameters describing metamorphosis of the Old Brahmaputra River fromhistorical maps (i.e., Rannell's Map in 1776, Tassin's Map in 1840, Topographic Survey Map in 1943) and remotely sensedoptical satellite imagery Sentinel-2 in 2022. Flood frequencies were investigated for different periods by applying Gumbel’sAnalytical Method (GAM), Log-Pearson Type III, and Log-Normal Method to estimate probability of flood vulnerabilityand impacts of flooding on morphodynamics in the central Bengal Basin. During the periods between 1776 and 2022, thearea of sedimentation (77,999.43 ha) was greater than the eroded area (2983.29 ha).This difference was attributed to siltationof the channel bed morphology and corresponding accelerated flood vulnerability that accompanied river metamorphosis.Hydrological variables particularly annual average discharge significantly declined from 22 to ~ 18 m3/s per year during theperiod from 1965 to 2020. The study results demonstrated that the log-normal methods significantly overestimated peakflood discharge compared to Log-Pearson methods and Gumbel’s probability model. The extrapolation of the discharge forthe 100-year flood by applying the three methods produced values of 712.66 m3/s, 1750.26 m3/s, and 2462.92 m3/s. Differencesof these magnitudes may be critical for planning purposes because these differences in results will generate large-scaleprojected impacts on morphodynamics of the central Bengal Basin.

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