Spatiotemporal development patterns and disaster-inducing factors of landslides in the main stream of Dadu River

Abstract

[Objective] The Dadu River Basin, a transition between the Qinghai-Xizang Plateau and Sichuan Basin, features towering mountains, deep valleys, and dramatic relief. Complex geology renders it highly prone to geological hazards. [Methods] Via multi-source data fusion, this work integrates geological surveys, remote sensing, spatiotemporal statistics, and case inversion to establish a framework. It explores landslide spatial-temporal distribution and synergies with topography,geology, rock-soil, slope structure, hydrology, and human activities, clarifying evolution patterns and multi-scale coupled disaster mechanisms in the main basin. A multi-factor landslide model is built, and geological-human activity synergies identified. [Results] Key findings:(1) 97% of landslides occur within 5 km of faults, concentrated in strong unloading zones(500~ 3 500 m elevation, 10° ~ 50° slope);(2) 94. 18% of landslides happen in May-September rainy season, correlating significantly with rainfall;(3) Landslide density within 5 km of hydropower hubs hits 0. 113/km², triple that of other areas. [Conclusion] Result show landslide spatial distribution is strongly structure-controlled; rainfall is the main trigger, with prominent engineering disturbance effects.

Keywords

engineering geology / landslide / spatiotemporal characteristics / influencing factors / Dadu River Basin / spatiotemporal distribution / remote sensing interpretation / geological structure