Landslide as sediment sources

Session description :

There is much variability of sediment yield in mountain river systems because it is influenced by both periodic and episodic events (snowmelt, high-intensity rainstorms, earthquakes …). Landslides (rock falls, slumps, deep-seated slides, debris flows …) are the most effective event that conveys large amounts of debris to the river channels through their frequent activities. Therefore, they should be treated within the framework of the integrated water management in catchments. After strong earthquakes or during typhoons and flash floods, many landslides occur and contribute large amounts of fresh sediments to the river network and influence river morphology and unbalance sediment budget.

Contributions, such as:

• landslide case studies and analyses of corresponding erosion rates as well as estimations of sediment supply rates to watercourses from headwaters and slopes

• natural landslide dam outbursts and their impact on river morphology and sediment transport

• assessment of landslides' contribution to overall erosion rate of landscape compared to other erosion agents

• well described countermeasures undertaken in torrents and rivers after increased sediment supply from landslides are welcome.