Evaluation of Local Scour along Rönne Å at Ängelholm
(2020) In TVVR20/5019 VVRM01 20201Division of Water Resources Engineering
- Abstract
- Riverbed scouring is an emerging problem aligned with higher frequent river discharges, experiences in a short period of time with shifting climate conditions. This problem brings a huge challenge to relevant authorities to safeguard river stability and hydraulic structures. This master thesis study is a preliminary investigation of the local scour problem along a Rönne å river stretch which falls under Ängelholm municipality, Skåne. The main objectives included a mapping of existing scour holes along the river reach with an evaluation of possible causes, building a hydraulic model for the river stretch, and estimating the potential scour risk of some existing bridges. HEC RAS one-dimensional model was selected to establish a hydrodynamic... (More)
- Riverbed scouring is an emerging problem aligned with higher frequent river discharges, experiences in a short period of time with shifting climate conditions. This problem brings a huge challenge to relevant authorities to safeguard river stability and hydraulic structures. This master thesis study is a preliminary investigation of the local scour problem along a Rönne å river stretch which falls under Ängelholm municipality, Skåne. The main objectives included a mapping of existing scour holes along the river reach with an evaluation of possible causes, building a hydraulic model for the river stretch, and estimating the potential scour risk of some existing bridges. HEC RAS one-dimensional model was selected to establish a hydrodynamic model for the downstream reach of about 12 km of the Rönne å river. Bathymetry and geometry analyses revealed that the existing deep sour holes may be developed mainly by general scour mechanisms, such as bend scour and presence of hard non-erodible river bottom. The HEC RAS bridge scour analyses for six bridges disclosed that the bridges have more threat from abutment scour than contraction scour. The bridge Tegelbruksbron has the highest prone to abutment scour and Kristian II Bridge has the highest threat from contraction scour among the bridges. The results are reasonably good for initial assessment stages in bridge scour evaluation and useful for future investigations. The study further suggested for Ängelholm municipality, to conduct a comprehensive sediment analysis along the riverbed to get more interpretations and potential evaluations. (Less)
- Popular Abstract
- Rivers are a vital component of nature. The sediment erosion from riverbed and riverbanks always makes an impact on the stability of the rivers. Generally, the erosion takes place in riverbed known as scouring. Riverbed scouring is an emerging problem aligned with higher frequent river discharges, experiences in a short time with changing climate conditions. This problem brings a crucial challenge to relevant authorities to safeguard river stability and hydraulic structures.
This master thesis study is a preliminary investigation of the riverbed scour problem along a Rönne å river stretch which falls under Ängelholm municipality, Skåne in Sweden. There have been concerns about the riverbank erosion in the Rönne å for many years. But... (More) - Rivers are a vital component of nature. The sediment erosion from riverbed and riverbanks always makes an impact on the stability of the rivers. Generally, the erosion takes place in riverbed known as scouring. Riverbed scouring is an emerging problem aligned with higher frequent river discharges, experiences in a short time with changing climate conditions. This problem brings a crucial challenge to relevant authorities to safeguard river stability and hydraulic structures.
This master thesis study is a preliminary investigation of the riverbed scour problem along a Rönne å river stretch which falls under Ängelholm municipality, Skåne in Sweden. There have been concerns about the riverbank erosion in the Rönne å for many years. But Ängelholm municipality was able to discover the riverbed scouring in early 2020 by an underwater bathymetry survey. The main objectives included a mapping of existing scour holes along the river reach with an evaluation of possible causes, building a hydraulic model for the river stretch, and estimating the potential scour risk of some existing bridges.
HEC RAS one-dimensional model was used to establish a hydraulic model for the downstream reach of about 12 km of the Rönne å river. The simulations have been performed using predicted extreme flows from flood frequency analysis.
In conclusion, the bathymetry and geometry analyses revealed that the existing deep sour holes may be developed mainly by general scour mechanisms, such as bend scour and presence of hard non-erodible river bottom. The HEC RAS bridge scour analysis is performed for six bridges. It disclosed that the bridges have more scour threat at near abutments than general riverbed at bridges. The results show that the bridge Tegelbruksbron has the highest scour risk from flows, and it could increase with higher flows.
The results are reasonably good for initial assessment stages in bridge scour evaluation and useful for future investigations. Overall, The study recommended Ängelholm municipality to conduct a comprehensive sediment analysis along the riverbed to get more interpretations and potential evaluations. (Less)
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/student-papers/record/9022215
- author
- Mohamed Inamdeen, Mohamed Fainaz LU
- supervisor
- organization
- alternative title
- Application of detailed bathymetric data in combination with HEC RAS modeling
- course
- VVRM01 20201
- year
- 2020
- type
- H2 - Master's Degree (Two Years)
- subject
- keywords
- HEC RAS, Rönne å, Bend scour, Contraction scour, Abutment scour, River flow, HEC 18
- publication/series
- TVVR20/5019
- report number
- 20/5019
- ISSN
- 1101-9824
- language
- English
- additional info
- Examiner: Rolf Larsson.
- id
- 9022215
- date added to LUP
- 2021-05-26 10:38:41
- date last changed
- 2021-05-26 10:38:41
@misc{9022215,
abstract = {{Riverbed scouring is an emerging problem aligned with higher frequent river discharges, experiences in a short period of time with shifting climate conditions. This problem brings a huge challenge to relevant authorities to safeguard river stability and hydraulic structures. This master thesis study is a preliminary investigation of the local scour problem along a Rönne å river stretch which falls under Ängelholm municipality, Skåne. The main objectives included a mapping of existing scour holes along the river reach with an evaluation of possible causes, building a hydraulic model for the river stretch, and estimating the potential scour risk of some existing bridges. HEC RAS one-dimensional model was selected to establish a hydrodynamic model for the downstream reach of about 12 km of the Rönne å river. Bathymetry and geometry analyses revealed that the existing deep sour holes may be developed mainly by general scour mechanisms, such as bend scour and presence of hard non-erodible river bottom. The HEC RAS bridge scour analyses for six bridges disclosed that the bridges have more threat from abutment scour than contraction scour. The bridge Tegelbruksbron has the highest prone to abutment scour and Kristian II Bridge has the highest threat from contraction scour among the bridges. The results are reasonably good for initial assessment stages in bridge scour evaluation and useful for future investigations. The study further suggested for Ängelholm municipality, to conduct a comprehensive sediment analysis along the riverbed to get more interpretations and potential evaluations.}},
author = {{Mohamed Inamdeen, Mohamed Fainaz}},
issn = {{1101-9824}},
language = {{eng}},
note = {{Student Paper}},
series = {{TVVR20/5019}},
title = {{Evaluation of Local Scour along Rönne Å at Ängelholm}},
year = {{2020}},
}