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Sediment transport in Säveån and its implications for erosion and bank stability

Sechu, Gasper (2015) VVR820
Division of Water Resources Engineering
Abstract
This master thesis study is a preliminary investigation of the Säveån River as
part of the Swedish Geotechnical Institute’s (SGI) landslide risk assessment
project. The main objectives include building a hydrodynamic model for the
river, estimating sediment transport along the river, assessing the implications
for erosion and bank stability and evaluating climate change effects on
sediment transport. The study section is from downstream Jonsered
hydropower plant to the outlet at Göta Älv. The model selected for the
hydrodynamic study is the one dimensional river analysis model HEC-RAS.
ArcGIS was used in combination with Hec-GeoRAS to map out the river and
extract cross sections from a Digital Elevation Model (DEM) of the river.
... (More)
This master thesis study is a preliminary investigation of the Säveån River as
part of the Swedish Geotechnical Institute’s (SGI) landslide risk assessment
project. The main objectives include building a hydrodynamic model for the
river, estimating sediment transport along the river, assessing the implications
for erosion and bank stability and evaluating climate change effects on
sediment transport. The study section is from downstream Jonsered
hydropower plant to the outlet at Göta Älv. The model selected for the
hydrodynamic study is the one dimensional river analysis model HEC-RAS.
ArcGIS was used in combination with Hec-GeoRAS to map out the river and
extract cross sections from a Digital Elevation Model (DEM) of the river.
Steady flow and sediment transport simulations were then done to obtain the
hydrodynamics and sediment transport of the river respectively. Model
results revealed schematized cross section 12500 close to the upstream end of
the study reach to have the most erosion. This section was then used as an
example to find the loss in slope stability due to sediment transport using the
model SLOPE/W. Climate change simulations were then done with flow data
from a simulated period of 2021-2050 and 2069-2098 and compared to a
reference period of 1963-1992. Results show that sediment transport is to
increase more than twice moving from the reference period to the period
2021-2050 and increase again more than twice from this period to the period
2069-2098 which signifies the end of the century. (Less)
Please use this url to cite or link to this publication:
author
Sechu, Gasper
supervisor
organization
course
VVR820
year
type
H2 - Master's Degree (Two Years)
subject
keywords
HEC-RAS, sediment transport, erosion, bank stability, climate change
report number
TVVR-15/5013
ISSN
1101-9824
language
English
id
8055386
date added to LUP
2015-10-13 11:05:51
date last changed
2015-10-13 11:06:24
@misc{8055386,
  abstract     = {This master thesis study is a preliminary investigation of the Säveån River as
part of the Swedish Geotechnical Institute’s (SGI) landslide risk assessment
project. The main objectives include building a hydrodynamic model for the
river, estimating sediment transport along the river, assessing the implications
for erosion and bank stability and evaluating climate change effects on
sediment transport. The study section is from downstream Jonsered
hydropower plant to the outlet at Göta Älv. The model selected for the
hydrodynamic study is the one dimensional river analysis model HEC-RAS.
ArcGIS was used in combination with Hec-GeoRAS to map out the river and
extract cross sections from a Digital Elevation Model (DEM) of the river.
Steady flow and sediment transport simulations were then done to obtain the
hydrodynamics and sediment transport of the river respectively. Model
results revealed schematized cross section 12500 close to the upstream end of
the study reach to have the most erosion. This section was then used as an
example to find the loss in slope stability due to sediment transport using the
model SLOPE/W. Climate change simulations were then done with flow data
from a simulated period of 2021-2050 and 2069-2098 and compared to a
reference period of 1963-1992. Results show that sediment transport is to
increase more than twice moving from the reference period to the period
2021-2050 and increase again more than twice from this period to the period
2069-2098 which signifies the end of the century.},
  author       = {Sechu, Gasper},
  issn         = {1101-9824},
  keyword      = {HEC-RAS,sediment transport,erosion,bank stability,climate change},
  language     = {eng},
  note         = {Student Paper},
  title        = {Sediment transport in Säveån and its implications for erosion and bank stability},
  year         = {2015},
}