Assessment of Sediment Transportation Along the Southern and Eastern Coast of Scania, Sweden: A Case Study of Storm Babet
(2024) In Student thesis series INES NGEK01 20241Dept of Physical Geography and Ecosystem Science
- Abstract
- The majority of the coastal area of Scania is highly susceptible to sediment transportation. Due to various influences which are both human induced and natural, the morphology of coastal dunes often alters. Therefore, it is important to assess these changes, especially after major cyclonic storms such as the storm Babet in order to get a comprehensive understanding of the aftermath. The purpose of this study is to assess changes in sediment volume after storm Babet, conduct a map quality assessment on the data used, as well as discuss various mitigation strategies along the coastal area of 8 municipalities stretching from Vellinge to Sölvesborg.
Using GIS, Digital Elevation Models (DEMs) from 2019 and 2023 were subtracted from each... (More) - The majority of the coastal area of Scania is highly susceptible to sediment transportation. Due to various influences which are both human induced and natural, the morphology of coastal dunes often alters. Therefore, it is important to assess these changes, especially after major cyclonic storms such as the storm Babet in order to get a comprehensive understanding of the aftermath. The purpose of this study is to assess changes in sediment volume after storm Babet, conduct a map quality assessment on the data used, as well as discuss various mitigation strategies along the coastal area of 8 municipalities stretching from Vellinge to Sölvesborg.
Using GIS, Digital Elevation Models (DEMs) from 2019 and 2023 were subtracted from each other, which yielded positive (accumulation) and negative (erosion) values. These values were analyzed individually across two digitized zones that were split per municipal border - zone 1 (from dune top to dune toe) and zone 2 (from dune toe to waterline). Both zones were digitized based on images interpretation, with the help of visual data such as HillShades and numerical data such as contour lines. However, it still yields some level of subjectiveness. The study found that Ystad had the highest change in zone 1 (-4.33 m³/m) and Bromölla the lowest (-0.01 m³/m). In zone 2, Simrishamn had the highest change (1.53 m³/m) and Sölvesborg the lowest (-0.16 m³/m). These variations are influenced by factors like sand availability, strong winds, urbanization, mitigation strategies, vegetation, and soil type of the specific area. Coastal areas consisting of pebbles, and vegetation resulted in less sediment displacement than area consisting of sand grains.
A site-specific assessment was done remotely for Anton Fiskares Väg (Ystad) and Rörum (Simrishamn), with volume change calculated per 1000 square meters and visualized using Getis-Ord-Gi* HotSpot analysis. This provided a clearer picture of erosion and accumulation patterns, indicating possible causes like wind patterns, barriers such as fallen trees as a result of Babet, and tourism.
Map quality was assessed by comparing DEMs with manually collected elevation data with high-precision coordinate points. It is concluded that the accuracy varied depending on the location and the date of the manually measured RTK-GNSS points. This alternation is influenced mainly by LiDAR errors but also altering environmental factors such as tides and sediment displacement. Even though not all volume changes can be attributed solely to Babet, it remains the most significant event between 2019 and 2023, influencing the majority of the volume changes during this period. For more significant research, it was concluded that continued site-specific volume change assessments and comparisons with other methods are recommended for better dune identification and monitoring. (Less)
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/student-papers/record/9163881
- author
- Tremasova, Yana LU
- supervisor
- organization
- course
- NGEK01 20241
- year
- 2024
- type
- M2 - Bachelor Degree
- subject
- keywords
- Volume Change Assessment, Storm Babet, Sediment Transportation, DEM, LiDAR
- publication/series
- Student thesis series INES
- report number
- 651
- language
- English
- additional info
- External supervisor: Sebastian Bokhari Irminger, Swedish Geotechnical Institute
- id
- 9163881
- date added to LUP
- 2024-06-14 14:44:58
- date last changed
- 2024-06-14 14:44:58
@misc{9163881,
abstract = {{The majority of the coastal area of Scania is highly susceptible to sediment transportation. Due to various influences which are both human induced and natural, the morphology of coastal dunes often alters. Therefore, it is important to assess these changes, especially after major cyclonic storms such as the storm Babet in order to get a comprehensive understanding of the aftermath. The purpose of this study is to assess changes in sediment volume after storm Babet, conduct a map quality assessment on the data used, as well as discuss various mitigation strategies along the coastal area of 8 municipalities stretching from Vellinge to Sölvesborg.
Using GIS, Digital Elevation Models (DEMs) from 2019 and 2023 were subtracted from each other, which yielded positive (accumulation) and negative (erosion) values. These values were analyzed individually across two digitized zones that were split per municipal border - zone 1 (from dune top to dune toe) and zone 2 (from dune toe to waterline). Both zones were digitized based on images interpretation, with the help of visual data such as HillShades and numerical data such as contour lines. However, it still yields some level of subjectiveness. The study found that Ystad had the highest change in zone 1 (-4.33 m³/m) and Bromölla the lowest (-0.01 m³/m). In zone 2, Simrishamn had the highest change (1.53 m³/m) and Sölvesborg the lowest (-0.16 m³/m). These variations are influenced by factors like sand availability, strong winds, urbanization, mitigation strategies, vegetation, and soil type of the specific area. Coastal areas consisting of pebbles, and vegetation resulted in less sediment displacement than area consisting of sand grains.
A site-specific assessment was done remotely for Anton Fiskares Väg (Ystad) and Rörum (Simrishamn), with volume change calculated per 1000 square meters and visualized using Getis-Ord-Gi* HotSpot analysis. This provided a clearer picture of erosion and accumulation patterns, indicating possible causes like wind patterns, barriers such as fallen trees as a result of Babet, and tourism.
Map quality was assessed by comparing DEMs with manually collected elevation data with high-precision coordinate points. It is concluded that the accuracy varied depending on the location and the date of the manually measured RTK-GNSS points. This alternation is influenced mainly by LiDAR errors but also altering environmental factors such as tides and sediment displacement. Even though not all volume changes can be attributed solely to Babet, it remains the most significant event between 2019 and 2023, influencing the majority of the volume changes during this period. For more significant research, it was concluded that continued site-specific volume change assessments and comparisons with other methods are recommended for better dune identification and monitoring.}},
author = {{Tremasova, Yana}},
language = {{eng}},
note = {{Student Paper}},
series = {{Student thesis series INES}},
title = {{Assessment of Sediment Transportation Along the Southern and Eastern Coast of Scania, Sweden: A Case Study of Storm Babet}},
year = {{2024}},
}