Extremväders påverkan på jorderosion : En GIS-modellering över Byälvens avrinningsområde

Sammanfattning: When the climate change contributes to a greater amount of extreme weather that does also affect the soil erosion and the number of areas that are being affected by the soil erosion. The areas affected by the soil erosion do often suffers from economic loss because of the loss in agricultural land caused by the soil erosion. The reason being that the soil losses nutrients something that leads to less harvest and poorer quality of the water. This bachelor thesis aims to study how soil erosion gets affected by the climate change, and more specific the extreme weather, by using a RUSLE analysis.  By knowing in what extent different areas most likely get affected by soil erosion, there is great possibilities to protect those areas by protection against erosion. In this thesis three analysis have been performed over areas located in Byälvens runoff-areas to extend the knowledge about how extreme weather affect the areas and out of that get a guideline for how similar areas might be affected. As a data source for the analysis Lantmäteriet, SGU and SMHI was used.  The result shows that three analysed areas in Byälvens runoff-areas most likely will lose 93-97 percent more sediment if the precipitation increases with 50 percent compared to 2020 annual value compared to the precipitation between the years of 1961 and 1991. This could be because of the climatological factors that affect the result and the increasement in land loss due to soil erosion. The increasement in soil erosion can depend on human activities that changes the soil structure, climatological factors, but it can also be because of the coal in soil.