The twin catastrophic flows occurred in 2014 at Ambato Range (28°09′–28°20′S), Catamarca Province, Northwest Argentina

摘要: Abstract Two destructive and almost simultaneous flows occurred in January 2014 Catamarca Province, Northwest Argentina. They took place the Ambato Sijan river watersheds where villages El Rodeo are located respectively. As a result, 15 people lost their lives, 100 houses buildings were destroyed bridges collapsed. In this paper, comprehensive assessment of flow events is done by study triggering conditions, basin morphometric parameters, deposits description runout characteristics. To achieve goal, field data, satellite image analysis, digital elevation model information empirical equations used. The data analysis suggests that two distinct process types acted watersheds. event was debris flood characterized an extremely high velocity (5.6 m/s) with peak 581 m3/s. generated abundant sediment influx coming from landslides storm different sub-basins break small landslide-dam. case ranged between 2 m/s to 4 m/s 472 important input sediments hillslopes translational slides during coalesced downstream forming one large flow. Morphometric differences basins under influenced type mechanism registered. catastrophic consequences highlight necessity early warning system based on rainfall thresholds hydrogeomorphic response basins.