Description

The product shows morphologically prominent traces in the terrain of occurred landslides on land as well as ravines in loose soil layers. Together with soil maps and elevation data, the information can be used for a comprehensive assessment of landslide sensitivity and soil stability. Most landslides have occurred in clay soils, but there are also traces of landslides in sandy soils, not least in the northern river valleys, as well as in moraine soils. Where landslides have occurred in sandy soils, silt or clay layers are often found under a superficial layer of sand. Traces of landslides have also been included to the extent that they have given rise to forms similar to landslides. The landslides have occurred sometime since the last ice age. In some cases, there is information about when the landslide occurred, see information on the website of the Swedish Geotechnical Institute: http://gis.swedgeo.se/skred/. Especially in the interior of Norrland there are a lot of traces of landslides in moraine terrain. These landslides have apparently been triggered by powerful earthquakes that took place during the last ice age or shortly thereafter, i.e. about 10 000 years ago. Ravines arise from the erosion of running water (surface water or groundwater effluent) in loose soil layers. In the event of increased run-off as a result of intense rainfall or changes in land use, new canyons may be created and existing canyons may grow. In the slopes of the ravines there is often less race and landslides. Both morphologically very prominent landslides and gorges as well as forms leveled by, for example, land planning and agriculture have been reported.

Resources

Name	Format	Description	Link
	0		https://resource.sgu.se/service/wms/130/jordskred-raviner

Tags

Topics

Categories