Work

Inundation Processes with Active Sediment Transportation in the Floodplain of West Rapti River, Nepal

Year: 2024

Type: article

Abstract: The present study discusses flood hazard characteristics in the lower reaches of the West Rapti River based on the results obtained from field surveys and numerical computations using depth averaged 2-D numerical models for flood flow and associated sediment transportation. To evaluate the inundation process with sediment erosion and deposition in the floodplain, a new erosion term was introduced into the mass conservation equations for suspended sediment and bed sediment. The results obtained from numerical computations indicated that field data on the spatial distributions of depths for inundation, and sediment erosion and deposition can be evaluated by the numerical model. Thus, numerical predictions were performed for the inundated areas, and the accumulated volumes of sediment erosion/deposition for floods with return periods of 50, 100, and 200 years, as a step towards damage assessment and risk assessment due to floods with active sediment transportation in the floodplains.

Source: Journal of Disaster Research

DOI: 10.20965/jdr.2024.p0836

Authors: Narayan Prasad Subedi, Atsuhiro Yorozuya, Shinji Egashira

Institutions: National Graduate Institute for Policy Studies, Public Works Research Institute, International Centre for Water Hazard and Risk Management, Department of Water Resources and Irrigation

Language: English

Topic: Flood Risk Assessment and Management

Subfield: Global and Planetary Change

Field: Environmental Science

Domain: Physical Sciences

SDG: Clean water and sanitation

Open Access status: diamond

OpenAlex ID: W4402984623

FWCI: 0.545

Cites: 16

Cited by: 3

Related to: 10