Factors Affecting the Rates and Modes of Landslide Colluvium Removal in River Channels of Podhale (Western Carpathians)

This paper presented some hydrological factors affecting the course and rate of fluvial erosion landslide colluvium at its contact with river flow. Volumes eroded by rivers in period 2013–2019 were measured Podhale (a part Polish West Carpathians) on four landslides representing various geological settings. At each landslide, changes shape position zone between water registered after episodes high stage. The obtained data relief fronts adjacent channels used to calculate volumes removed during episode. compared stage records for studied time. Intensity was found be strongly dependent levels cohesion colluvium. greatest short-lived (1–2 days) prolonged (7–10 periods stages. erosional removal highest consisting poorly consolidated Quaternary matrix-supported massive gravel overlying fine deposits stored within terraces. Colluvium composed Neogene mudstones sandstones a lower lowest large blocks slices solid layers alternating sandstone shales belonging Flysch series. Erosion toes more intense those sites where flow approached front wider angle.