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1 Acta Geophysica

1 2024

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Holistic framework for flood hazard assessment in a trans-boundary basin

Baruah Anupal, Barman Diganta, Arjun Balakrishna Madayala, Chyne Bajitborlang L., Aggarwal Shiv P

Acta Geophysica

2024

Vol. 72, no. 2

1017--1032

The rainfall in the upper catchments associated with the hydro peaking events disturbs the regular flow regimes and is often responsible for downstream flooding in alluvial plains. The unregulated release from a hydropower dam abruptly alters the flow dynamics and inundates the adjacent floodplains. In this work, an integrated modeling framework is developed by linking a semi-distributed hydrological model, a two-dimensional hydrodynamic model with a multi-criteria decision approach, to investigate the downstream flooding of Beki River in Assam, India due to the storm runoff and release from the Kurichu Dam, Bhutan. A 48-h rainfall event and dam release flow from 16/06/2022-18/06/2022 is selected for the hydrological simulations. The computed hydrograph is used as an upstream boundary condition in the 2D model to generate the different flow scenarios up to the confluence point of the Brahmaputra River. The results indicate that a peak of 4970.86 m3/s is attained at downstream with an attenuation of 5.976%. The velocity in the stream ranges between 0.77 and 1.14 m/s, and near the meanders, it reaches up to 1.31 m/s. The computed hazard map indicates that some embankments and the road networks in the four revenue circles are significantly affected due to flooding. The proposed methodology and outcomes of the study will be useful for the effective management and monitoring of floods, especially in flood-prone regions.