Abstract: The application of unmanned aerial vehicles (UAVs) in the comprehensive prevention and control of geological hazard risks for transmission lines still faces challenges including fragmented operational scenarios,insufficient data fusion,and lack of systematic methodologies.This study focuses on mountainous transmission lines threatened by geological hazards such as collapses and landslides.Targeting multi-scale scenarios encompassing macro-regional,meso-key,and micro-local dimensions,we fully utilize various photogrammetric techniques (vertical,oblique,and close-range imaging) combined with multi-scale scenario fusion methods.A technical framework and implementation process for UAV-based multi-scale fusion in geological hazard management are proposed,covering field operations,product generation,and practical applications.Key technical approaches including multi-mode field operation combinations and multi-scale indoor fusion modeling are elucidated.The proposed methodology was applied to a high-risk transmission line section in the Three Gorges Reservoir area of western Hubei province.Results demonstrate its effectiveness in supporting rapid construction of real-scene 3D platforms while fulfilling comprehensive requirements for hazard identification/assessment,mitigation design,and deformation monitoring,thereby verifying its practical applicability.

Key words: transmission lines, geological hazard risks, comprehensive prevention and control, UAV photogrammetry, multi-scale fusion