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The Göta River provides about 700,000 people with drinking water. A landslide in a contaminated area could have serious consequences for the water supply. Landslides could also affect individuals and buildings, as well as important societal functions such as roads, railways, shipping lanes and power plants.

Climate change means that many areas along the river will have an even greater risk of landslides, if no action is taken. But much can be done to prevent landslides.

The government has given the Swedish Geotechnical Institute the task of reducing the risk of landslides along the Göta River. This work is being done together with the Delegation for the Göta River. The Delegation is providing knowledge about the areas along the river, helping to plan the landslide protection work, giving advice on which landslide protection measures should receive central government subsidies.

With effect from December 2020, the Delegation for the Göta River is financing up to 100 per cent of the cost of the actual geotechnical measures along the river. The purpose is to perform measures to improve the geotechnical knowledge and the ground stability conditions and thus reduce the likelihood of landslides in high-risk areas.

Landslide mitigation measures along the Göta River

The map below shows how the work along the Göta River is progressing. The areas being investigated are those identified by the Göta River Investigation in 2012 as having an elevated risk of landslides. The map is in Swedish.

Click to view a larger map

About the Göta River valley

Photo: Mikael Svensson

  • The Göta River is the largest river in Sweden and runs through a 93 km long valley. It flows from Lake Vänern to the city of Gothenburg, traversing six municipalities along its course.
  • Historically, the Göta River valley constituted a deep marine inlet connected to the North Sea. Within this environment, substantial clay deposits accumulated by fine sediments transported by meltwater from the retreating inland ice sheet out in the sea. At present, the clay deposits reach depths of between 20 and 100 metres in many locations.
  • The Göta River valley contains so-called quick clay, a highly sensitive material. If a landslide is triggered, the rapid loss of strength in the quick clay may cause the ground failure to propagate over a large area, resulting in extensive damage and significant consequences.
  • Climate change is projected to increase both precipitation and river discharge in the Göta River. These changes will intensify erosion within the river channel and raise pore water pressures in the adjacent clay deposits. Consequently, the probability of landslide occurrence is expected to increase further in the future.

 

The Göta River investigation

In 2008 the Swedish Government commissioned the Swedish Geotechnical Institute to conduct a mapping of the risks of landslides along the Göta River. The results and conclusions gave rise to several reports. Two of them are available in English.

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Article in IOP Conference Series

At the 3rd International Workshop on Landslides in Sensitive Clay (IWLSC 2025), SGI will present a paper about the ongoing work to reduce landslide risks along the Göta River.

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