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Using HEC-HMS and HEC-RAS Models for Rainfall-Runoff Simulation and Flood Inundation Mapping: Case Studies from Nepal and Sweden

Khadka, Jeevika ; Bhaukajee, Jagritee ; Zhang, Linus Tielin LU orcid and Frisk, M (2018) AGU (American Geophysical Union) Fall Meeting, 2018
Abstract
Understanding catchment behaviour through rainfall-runoff models allows decision makers for proper planning and operation in context of flood risk management. However accurate rainfall-runoff and flood modelling at high spatio-temporal resolutions still remains a significant challenge in any hydrologic and hydraulic studies. This study seeks to develop Hydrologic Engineering Centre’s Hydrologic Modelling System (HEC-HMS) and Hydrologic Engineering Centre’s River Analysis System (HEC-RAS) models to simulate the effects of rainfall on surface runoff and generate flood inundation maps for Kankai and Kävlinge river. The Kankai River is rainfed perennial river of eastern Nepal which recieves concentrated precipitation mostly during summer... (More)
Understanding catchment behaviour through rainfall-runoff models allows decision makers for proper planning and operation in context of flood risk management. However accurate rainfall-runoff and flood modelling at high spatio-temporal resolutions still remains a significant challenge in any hydrologic and hydraulic studies. This study seeks to develop Hydrologic Engineering Centre’s Hydrologic Modelling System (HEC-HMS) and Hydrologic Engineering Centre’s River Analysis System (HEC-RAS) models to simulate the effects of rainfall on surface runoff and generate flood inundation maps for Kankai and Kävlinge river. The Kankai River is rainfed perennial river of eastern Nepal which recieves concentrated precipitation mostly during summer months. Whereas Kävlinge river is situated in the southern part of Sweden in Skåne county and has temperate climate with precipitation, mostly in the form of snow occurring throughout the year. Being in a complete different hydrological and geographical setting, model parameters of these catchment models have varied significance level to modelling methods, which have been critically analyzed here through sensitivity analysis. Using HEC-RAS 1D model, flood inundation maps for 100-year flood are also generated and their potential impacts across the adjoing area have been discussed with possible recommendation on flood management strategies for each region. (Less)
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type
Contribution to conference
publication status
published
subject
conference name
AGU (American Geophysical Union) Fall Meeting, 2018
conference location
Washington, United States
conference dates
2018-12-10 - 2018-12-14
language
English
LU publication?
yes
id
3ab2c053-9d2b-446f-898e-f9648376ca4c
date added to LUP
2019-02-10 01:26:30
date last changed
2019-06-18 13:00:00
@misc{3ab2c053-9d2b-446f-898e-f9648376ca4c,
  abstract     = {{Understanding catchment behaviour through rainfall-runoff models allows decision makers for proper planning and operation in context of flood risk management. However accurate rainfall-runoff and flood modelling at high spatio-temporal resolutions still remains a significant challenge in any hydrologic and hydraulic studies. This study seeks to develop Hydrologic Engineering Centre’s Hydrologic Modelling System (HEC-HMS) and Hydrologic Engineering Centre’s River Analysis System (HEC-RAS) models to simulate the effects of rainfall on surface runoff and generate flood inundation maps for Kankai and Kävlinge river. The Kankai River is rainfed perennial river of eastern Nepal which recieves concentrated precipitation mostly during summer months. Whereas Kävlinge river is situated in the southern part of Sweden in Skåne county and has temperate climate with precipitation, mostly in the form of snow occurring throughout the year. Being in a complete different hydrological and geographical setting, model parameters of these catchment models have varied significance level to modelling methods, which have been critically analyzed here through sensitivity analysis. Using HEC-RAS 1D model, flood inundation maps for 100-year flood are also generated and their potential impacts across the adjoing area have been discussed with possible recommendation on flood management strategies for each region.}},
  author       = {{Khadka, Jeevika and Bhaukajee, Jagritee and Zhang, Linus Tielin and Frisk, M}},
  language     = {{eng}},
  month        = {{12}},
  title        = {{Using HEC-HMS and HEC-RAS Models for Rainfall-Runoff Simulation and Flood Inundation Mapping: Case Studies from Nepal and Sweden}},
  year         = {{2018}},
}