Metodik för kartläggning och klassificering av erosion och släntstabilitet i vattendrag
Author
Summary, in English
Erosion of river basins and adjacent bank environment is a major environmental problem that is expected to increase in the future due to climate change. The Swedish geotechnical institute (SGI) has been granted funding by the Swedish government for mapping major rivers in Sweden with regard to the risk of landslides due to climate
change. A river's vulnerability to erosion can be assessed based on an index where the vulnerability is classified with a class, such as high or low. The purpose of this project is to investigate which methods are available and propose improvements as well as to establish a new or improved version of SGI's method. The study area is approximately 3 km of the Säve river, starting at Lake Aspen, from which the majority passes through the town of Lerum. The study area was divided into four different subdivisions based on fieldwork and was classified using both SGI's method and a modified version. With SGI's classification method the entire study area was classified as highly vulnerable to erosion. The modified method illustrates vulnerability differences within the study area by, among other things, implementing two new parameters. The modified method changes the vulnerability class assessment by
broadly classifying the study area as moderate (class 2) instead of high (class 3). Vulnerability analyzes demonstrate difficulties in objectivity and the difficulty in classifying a river at an absolute level. Furthermore, available classification methods are few and inadequate.
change. A river's vulnerability to erosion can be assessed based on an index where the vulnerability is classified with a class, such as high or low. The purpose of this project is to investigate which methods are available and propose improvements as well as to establish a new or improved version of SGI's method. The study area is approximately 3 km of the Säve river, starting at Lake Aspen, from which the majority passes through the town of Lerum. The study area was divided into four different subdivisions based on fieldwork and was classified using both SGI's method and a modified version. With SGI's classification method the entire study area was classified as highly vulnerable to erosion. The modified method illustrates vulnerability differences within the study area by, among other things, implementing two new parameters. The modified method changes the vulnerability class assessment by
broadly classifying the study area as moderate (class 2) instead of high (class 3). Vulnerability analyzes demonstrate difficulties in objectivity and the difficulty in classifying a river at an absolute level. Furthermore, available classification methods are few and inadequate.
Department/s
Publishing year
2017
Language
Swedish
Publication/Series
Examensarbeten i geologi vid Lundsuniversitet
Full text
- Available as PDF - 18 MB
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Document type
Student publication for Master's degree (two years)
Topic
- Earth and Environmental Sciences
Keywords
- vattendrag
- jordskred
- klimatförändringar
- sårbarhetsanalys
- klassificeringsindex
- coastal vulnerability index (CVI)
- erosion
- jordmekanik
- Säveån
- Västra Götaland
Supervisor
- Wilhelm Rankka
- Per Möller (Professor)
Scientific presentation