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Konsekvenser av stigande havsnivå för ett kustsamhälle : en fallstudie av VA systemet i Beddingestrand

Fast, Anette LU (2014) In Examensarbete INES NGEK01 20141
Dept of Physical Geography and Ecosystem Science
Abstract (Swedish)
Den globala uppvärmningen fortsätter vilket leder till stigande havsnivåer som kan påverka kustnära samhällen världen runt. Stigande havsnivåer påverkar i sin tur erosionsprocesser, som ökar när havet stiger och mer material kan omarbetas av vågor och strömmar. Skånes sydkust är utsatt för erosion på ett flertal lokaler, vilket har lett till en förändrad strandlinje och vid höga vattenstånd har infrastruktur tagit skada.

Denna studie syftar till att undersöka vilka konsekvenser för VA systemet som framtida förhöjda havsnivåer troligen kommer att ha för ett kustsamhälle i Skåne. Studien är utförd i samarbete med Tekniska Förvaltningen i Trelleborgs kommun som ansvarar för VA nätverket. I samråd med Trelleborgs kommun valdes samhället... (More)
Den globala uppvärmningen fortsätter vilket leder till stigande havsnivåer som kan påverka kustnära samhällen världen runt. Stigande havsnivåer påverkar i sin tur erosionsprocesser, som ökar när havet stiger och mer material kan omarbetas av vågor och strömmar. Skånes sydkust är utsatt för erosion på ett flertal lokaler, vilket har lett till en förändrad strandlinje och vid höga vattenstånd har infrastruktur tagit skada.

Denna studie syftar till att undersöka vilka konsekvenser för VA systemet som framtida förhöjda havsnivåer troligen kommer att ha för ett kustsamhälle i Skåne. Studien är utförd i samarbete med Tekniska Förvaltningen i Trelleborgs kommun som ansvarar för VA nätverket. I samråd med Trelleborgs kommun valdes samhället Beddingestrand och delar av samhället Skateholm ut som lämplig studielokal, detta pga. kusten där idag utsätts för erosion och där finns kustnära VA strukturer. De två orterna är sammanväxta och breder ut sig längs med kusten vid den östra gränsen av Trelleborgs kommun, på Skånes sydkust.

Utifrån den senaste rapporten från FN:s klimatpanel och oceanografiska data arbetades en tydlig bild av stigande havsnivåer och dess inverkan på VA systemet fram för två perioder under detta århundrade, 2046-2065 och 2081-2100. Vidare undersöktes vilka ytterligare delar som kan påverkas vid tillfälliga högvatten med 2, 10, 50 och 100 års återkomstperioder.

De resulterande kartorna visar tydligt vilka delar av det lokala VA systemet som kan påverkas. Kartorna kompletterades med detaljerade tabeller som kvantifierar hur stor mängd av olika komponenter inom systemet som kan påverkas vid olika högvattenstånd. Vid analys av resultaten kunde följande slutsatser påvisas:

• Medelvärdet för den globala havsnivåhöjningen påverkar inte VA systemet direkt, men i kombination med tillfälliga högvatten kan stora delar påverkas.
• De mest utsatta områdena för framtida havsnivåhöjning och högvattenstånd är vid befintliga vattendrag och bitvis längs med strandlinjen.
• Fler och större partier av VA systemet riskerar att påverkas ju högre växthusgasutsläppen är.
• Ju högre växthusgasutsläppen är desto fler delar av VA systemet påverkas vid högvatten med mer frekvent återkomstperiod.
• Fler och större partier av VA systemet riskerar att påverkas i slutet av 2000-talet än i mitten av detta århundrade.
• Kustlinjen i Beddingestrand och Skateholm kommer att fortsätta förändras genom erosionsprocesser, vilket kan påverka VA systemet.

Resultaten kan utgöra underlag för framtida planering av åtgärder i studieområdet. Delar av det material som arbetats fram kan också ligga till grund för framtida undersökningar av Beddingestrand och Skateholm. Sådana studier skulle kunna ge en detaljerad bild av framtida förändringar genom erosion, vilket endast har behandlats generellt i denna studie. (Less)
Abstract
Global warming continues, leading to rising sea-levels that could affect coastal communities around the world. Rising sea levels in turn affect erosion processes, which increase as sea-levels rise and more material can be reworked by waves and currents. The south coast of Scania is exposed to erosion at several locations, which has led to an altered shoreline and damage of infrastructure during high water events.

This study aims to investigate the consequences that a future sea-level rise is likely to have on the water supply system in a coastal community in southern Sweden. The study is conducted in collaboration with the Technical Administration of Trelleborg Municipality, responsible for the water supply system. In consultation with... (More)
Global warming continues, leading to rising sea-levels that could affect coastal communities around the world. Rising sea levels in turn affect erosion processes, which increase as sea-levels rise and more material can be reworked by waves and currents. The south coast of Scania is exposed to erosion at several locations, which has led to an altered shoreline and damage of infrastructure during high water events.

This study aims to investigate the consequences that a future sea-level rise is likely to have on the water supply system in a coastal community in southern Sweden. The study is conducted in collaboration with the Technical Administration of Trelleborg Municipality, responsible for the water supply system. In consultation with Trelleborg Municipality the community Beddingestrand and parts of the community Skateholm were chosen as the study area, due to the coast here being exposed to erosion and the water supply system is located near the shoreline. The two communities are fused together, and spreads out along the coast at the eastern boundary of the municipality of Trelleborg on the south coast of Scania.

Based on the latest report from the UN's climate panel and oceanographic data, detailed visualisations of sea-level rise and its impact on the water supply system were developed for two periods during the century; 2046-2065 and 2081-2100. Moreover, it was examined which additional parts that may be affected by temporary floods with 2, 10, 50 and 100 year return periods.

The resulting maps show clearly which parts of the local water supply system that can be affected. These were supplemented by detailed tables that quantify the amount of various components within the system that can be affected by various flood stalls. When analysing the results the following conclusions can be demonstrated:

• The mean global sea-level rise does not have any direct affect on the water supply system in the study area, but in combination with temporary high tide large parts can be affected.
• The most vulnerable areas for future sea-level rise and high tide are in the vicinity of existing watercourses and in certain locations along the shoreline.
• More and larger areas will likely be affected at higher greenhouse gas emissions.
• Higher greenhouse gas emissions results in more areas being affected at high tide with more frequent recurrence intervals.
• More and larger areas are likely to be affected in the late 2000s than in the middle of this century.
• The coastline of Beddingestrand and Skateholm will continue to change due to erosion processes.

The results can provide a basis for future action planning in the study area. The material that has been developed could also be the basis for future investigations of Beddingestrand and Skateholm. Such studies could provide a detailed picture of future changes by erosion, which has only been treated in general in this study. (Less)
Please use this url to cite or link to this publication:
author
Fast, Anette LU
supervisor
organization
course
NGEK01 20141
year
type
M2 - Bachelor Degree
subject
keywords
global sea-level rise, Trelleborgs kommun, Skåne, VA system, RCP, IPCC, global havsnivåhöjning, klimatförändring, climate change, water supply system, Scania, Trelleborg Municipality
publication/series
Examensarbete INES
report number
313
language
Swedish
additional info
Extern handledare Hans Lilja, Tekniska Förvaltningen, Trelleborgs Kommun
id
4530165
date added to LUP
2014-07-02 16:27:42
date last changed
2014-09-04 09:18:20
@misc{4530165,
  abstract     = {{Global warming continues, leading to rising sea-levels that could affect coastal communities around the world. Rising sea levels in turn affect erosion processes, which increase as sea-levels rise and more material can be reworked by waves and currents. The south coast of Scania is exposed to erosion at several locations, which has led to an altered shoreline and damage of infrastructure during high water events.

This study aims to investigate the consequences that a future sea-level rise is likely to have on the water supply system in a coastal community in southern Sweden. The study is conducted in collaboration with the Technical Administration of Trelleborg Municipality, responsible for the water supply system. In consultation with Trelleborg Municipality the community Beddingestrand and parts of the community Skateholm were chosen as the study area, due to the coast here being exposed to erosion and the water supply system is located near the shoreline. The two communities are fused together, and spreads out along the coast at the eastern boundary of the municipality of Trelleborg on the south coast of Scania.

Based on the latest report from the UN's climate panel and oceanographic data, detailed visualisations of sea-level rise and its impact on the water supply system were developed for two periods during the century; 2046-2065 and 2081-2100. Moreover, it was examined which additional parts that may be affected by temporary floods with 2, 10, 50 and 100 year return periods.

The resulting maps show clearly which parts of the local water supply system that can be affected. These were supplemented by detailed tables that quantify the amount of various components within the system that can be affected by various flood stalls. When analysing the results the following conclusions can be demonstrated:

•	The mean global sea-level rise does not have any direct affect on the water supply system in the study area, but in combination with temporary high tide large parts can be affected.
•	The most vulnerable areas for future sea-level rise and high tide are in the vicinity of existing watercourses and in certain locations along the shoreline.
•	More and larger areas will likely be affected at higher greenhouse gas emissions.
•	Higher greenhouse gas emissions results in more areas being affected at high tide with more frequent recurrence intervals.
•	More and larger areas are likely to be affected in the late 2000s than in the middle of this century.
•	The coastline of Beddingestrand and Skateholm will continue to change due to erosion processes.

The results can provide a basis for future action planning in the study area. The material that has been developed could also be the basis for future investigations of Beddingestrand and Skateholm. Such studies could provide a detailed picture of future changes by erosion, which has only been treated in general in this study.}},
  author       = {{Fast, Anette}},
  language     = {{swe}},
  note         = {{Student Paper}},
  series       = {{Examensarbete INES}},
  title        = {{Konsekvenser av stigande havsnivå för ett kustsamhälle : en fallstudie av VA systemet i Beddingestrand}},
  year         = {{2014}},
}