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Impact of extreme flows on bridges : A case study from Lagan river, Ljungby

Tahir, Assad LU orcid ; Inamdeen, Fainaz LU orcid and Larson, Magnus LU (2022) In Vatten: tidskrift för vattenvård /Journal of Water Management and research 78(3). p.213-224
Abstract
Flowing water impacts bridges over rivers primarily in two ways: (1) hydrodynamic forces that directly impact the structure and (2) scouring at piers and abutments, including contraction scour. The design prin-ciples for bridges in Sweden, including both impacting forces and local scour, are relatively simplistic. The purpose of this paper is to examine the impact of extreme river flows on bridges, particularly in circumstances beyond the design flow, using as a case study Ljungby Municipality. Although the study was made with focus on Swedish conditions, the work is to a large extent based on international literature and experiences. First, an overview of the literature on the impacts of extreme river flows on bridges was conducted. This... (More)
Flowing water impacts bridges over rivers primarily in two ways: (1) hydrodynamic forces that directly impact the structure and (2) scouring at piers and abutments, including contraction scour. The design prin-ciples for bridges in Sweden, including both impacting forces and local scour, are relatively simplistic. The purpose of this paper is to examine the impact of extreme river flows on bridges, particularly in circumstances beyond the design flow, using as a case study Ljungby Municipality. Although the study was made with focus on Swedish conditions, the work is to a large extent based on international literature and experiences. First, an overview of the literature on the impacts of extreme river flows on bridges was conducted. This was followed by a numerical study using the HEC RAS (1D – steady flow) hydraulic model to simulate the impact of extreme flows on bridges in Ljungby. This resulted in inundation and flood hazard maps for the study area, besides the determination of overflowed bridges. A 100-year event resulted in the overflowing of the Ljungsätersbron. During the 200-year event, Ljungsätersbron and Söderbron overflowed. Also, abut-ment scour analyses were performed for all bridges. Overall, the modeling approach provided a satisfactory estimation of the potential threats posed by scouring at bridges abutments during extreme flow conditions. (Less)
Please use this url to cite or link to this publication:
author
; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
River hydraulics, Extreme floods event, HEC RAS, hydrodynamic model, Bridge scour
in
Vatten: tidskrift för vattenvård /Journal of Water Management and research
volume
78
issue
3
pages
213 - 224
publisher
Föreningen Vatten
ISSN
0042-2886
language
English
LU publication?
yes
id
c6ffa514-00e2-4052-9db1-441f6e890a74
alternative location
https://www.tidskriftenvatten.se/tsv-artikel/impact-of-extreme-flows-on-bridges-a-case-study-from-lagan-river-ljungby/
date added to LUP
2024-05-19 10:17:48
date last changed
2024-05-23 12:02:34
@article{c6ffa514-00e2-4052-9db1-441f6e890a74,
  abstract     = {{Flowing water impacts bridges over rivers primarily in two ways: (1) hydrodynamic forces that directly impact the structure and (2) scouring at piers and abutments, including contraction scour. The design prin-ciples for bridges in Sweden, including both impacting forces and local scour, are relatively simplistic. The purpose of this paper is to examine the impact of extreme river flows on bridges, particularly in circumstances beyond the design flow, using as a case study Ljungby Municipality. Although the study was made with focus on Swedish conditions, the work is to a large extent based on international literature and experiences. First, an overview of the literature on the impacts of extreme river flows on bridges was conducted. This was followed by a numerical study using the HEC RAS (1D – steady flow) hydraulic model to simulate the impact of extreme flows on bridges in Ljungby. This resulted in inundation and flood hazard maps for the study area, besides the determination of overflowed bridges. A 100-year event resulted in the overflowing of the Ljungsätersbron. During the 200-year event, Ljungsätersbron and Söderbron overflowed. Also, abut-ment scour analyses were performed for all bridges. Overall, the modeling approach provided a satisfactory estimation of the potential threats posed by scouring at bridges abutments during extreme flow conditions.}},
  author       = {{Tahir, Assad and Inamdeen, Fainaz and Larson, Magnus}},
  issn         = {{0042-2886}},
  keywords     = {{River hydraulics; Extreme floods event; HEC RAS; hydrodynamic model; Bridge scour}},
  language     = {{eng}},
  month        = {{12}},
  number       = {{3}},
  pages        = {{213--224}},
  publisher    = {{Föreningen Vatten}},
  series       = {{Vatten: tidskrift för vattenvård /Journal of Water Management and research}},
  title        = {{Impact of extreme flows on bridges : A case study from Lagan river, Ljungby}},
  url          = {{https://www.tidskriftenvatten.se/tsv-artikel/impact-of-extreme-flows-on-bridges-a-case-study-from-lagan-river-ljungby/}},
  volume       = {{78}},
  year         = {{2022}},
}