Flow-Type Landslides Analysis in Arid Zones: Application in La Chimba Basin in Antofagasta, Atacama Desert (Chile)

In the world, hazards of intense rainfall are recurrent and increasing. addition, they one natural that cause most severe damage to infrastructure even deaths every year. Flow-type landslides capable develop in areas with different geomorphological, geological climatic characteristics. hyper-arid zones such as Atacama Desert, these a timely manner, causing catastrophes. This study analyzes flow-type landslide mountainous area La Chimba basin Antofagasta city (Chile). For this, hydrometeorological analysis is carried out through pluviometric analysis, statistical frequencies Gumbel probabilistic method extreme values determination maximum flows by obtaining IDF (intensity-duration-frequency) curves design intensity function concentration time. To obtain liquid runoff debris, for return periods, rational was used proposed O’Brien. impact zone, modeling software HEC-RAS (Hydrologic Engineering Center’s River Analysis System) RAMMS (Rapid Mass Movements). Hydrographs period about 200 years, considered unfavorable scenario Voellmy–Salm model. validate modeling, morphometric, sedimentological comparative between real 1991 event those generated this study. It concluded morphometric characteristics indicate type flow it can originate would have rapid response events great or duration. The provided represents fluvial-type flow, while closer consistency landslide, which estimated be reality. results show despite being factor triggering areas.