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Three-Dimensional Simulation of Flood Propagation at Syabrubesi, Nepal
Abstract
Three-dimensional flood propagation through the Bhote Koshi--Langtang Khola junction at Syabrubesi, Nepal, is studied using an incompressible free-surface model. The calculation is motivated by the August 2026 flood and examines the passage of an imposed inflow through the local bends and changes in channel width. The Navier--Stokes equations and an interface transport equation are solved on unstructured tetrahedral meshes constructed from pre-event terrain data. For an inlet speed of 10 m s−1, the solution indicates surface speeds above 40 m s−1. The advancing front spreads across the junction; as the flow develops, water deepens and slows around the bend. Higher speeds persist in the confined upstream and downstream regions.
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BibTeX
@misc{lohner2026threedimensional,
title = {{Three-Dimensional Simulation of Flood Propagation at Syabrubesi, Nepal}},
author = {Rainald Löhner and Harbir Antil},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.38351},
eprint = {2609.38351},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.38351},
}
RIS
TY - UNPB
TI - Three-Dimensional Simulation of Flood Propagation at Syabrubesi, Nepal
AU - Rainald Löhner
AU - Harbir Antil
PY - 2026
DA - 2026/09/29
PB - arXiv
DO - 10.48550/arxiv.2609.38351
UR - https://arxiv.org/abs/2609.38351
AB - Three-dimensional flood propagation through the Bhote Koshi--Langtang Khola junction at Syabrubesi, Nepal, is studied using an incompressible free-surface model. The calculation is motivated by the August 2026 flood and examines the passage of an imposed inflow through the local bends and changes in channel width. The Navier--Stokes equations and an interface transport equation are solved on unstructured tetrahedral meshes constructed from pre-event terrain data. For an inlet speed of 10 m s^−1, the solution indicates surface speeds above 40 m s^−1. The advancing front spreads across the junction; as the flow develops, water deepens and slows around the bend. Higher speeds persist in the confined upstream and downstream regions.
ER -