Spatial distribution characteristics of landslides in Xiluodu Reservoir Area

Abstract

There are many landslides in Xiluodu Reservoir Area. 161 landslides were interpreted to investigate. The key influential factors including the formation lithology, faults, rainfall, earthquake, reservoir water level and the Geodetecter methods was used to explore the relative impact of the factors and the interaction of the two factors on the spatial distribution of landslides. The results show that: (1) Due to the differences in the properties of different rock groups, the landslides show significant regional differences; (2) The landslides are mostly distributed in the range of 600~1200 m, 10°~40°, Ordovician-Silurian (O-S) strata, areas within 4 km of the fault, areas where the average annual rainfall is 800~900 mm and seismic peak ground acceleration of 0.15g; (3) There are 53 landslides affected by reservoir water. The effect is most obvious when the water level acts on the middle and front of the landslide. The effect time is gradually weakened with the annual deformation and stress adjustment; (4) Multi-factor interaction presents more clear relationship with the spatial distribution of landslides. The interaction of lithology and rainfall can explain 45.9 % of the spatial variation of landslides, which means that lithology and rainfall factors have the greatest influence on the spatial distribution of landslides. The results provide a certain basis for the prevention and control of landslides in Xiluodu Reservoir Area.