Kusterosion på sydvästra Gotland : En undersökning i GIS och berggrundsgeologi

Sammanfattning: Southwestern Gotland has a relatively diverse bedrock where both sandstone, limestone and marl areexposed. The purpose of the survey has been to investigate differences in coastal erosion regarding thecontent of the bedrock. This was done by taking samples from 9 different locations which were laterexamined in point load tests and a slake durability test. A GIS-analysis was also done where the coastalarea in old aerial images and modern orthophotos were compared. The results showed that the sandstoneand marl samples were approximately equally prone to break and that limestone was less prone. Theslake durability test showed that sandstone from one site had the least resistance to abrasion, sandstonefrom the marl areas had greater resistance and that the limestone area had marginally greater resistancethan the marl areas. The GIS analysis indicated that the sandstone and marl areas had a relatively highsensitivity to coastal erosion and that the limestone area was not particularly exposed to coastal erosion.