Análisis de susceptibilidad a movimientos de tierra tramo Chanlud - Tuñi (Cuenca Alta), Complejo Hidroeléctrico Machángara, Azuay, Ecuador

Abstract

This document evaluates the landslide susceptibility in a section of the upper basin of the Machángara River, specifically in the upper area of the Chanlud-Tuñi segment, spanning from kilometer marker 0+000 to kilometer marker 3+000. This segment begins at the crest of the Chanlud dam and is part of the water conveyance system of the Machángara Hydroelectric Complex, located on the border between the provinces of Cañar and Azuay, Ecuador.The study is based on the Mora and Vahrson methodology, which integrates six factors: lithology, slope, moisture, vegetation cover, seismic activity, and precipitation. Using lithological, hydrological, seismic, and topographic information collected from various sources and complemented by field and laboratory data, individual maps were developed for each variable defined by Mora and Vahrson. These maps were then combined to produce a final susceptibility map of the study area, highlighting the sectors most vulnerable to potential landslide risks. The resulting susceptibility map revealed that most of the conveyance segment lies in areas of moderate susceptibility, with certain zones of high susceptibility concentrated in the lower part of the conveyance axis. These findings provide a valuable reference and starting point for future evaluations and risk management efforts in the area.