Characteristics and prevention suggestions of geological disasters caused by"23·7"heavy rainfall in Mentougou District,Beijing
From July 29,2023 to August 2,2023,extremely heavy rainfall occurred in Beijing,with the highest precipitation re-corded by instruments in 140 years.The average precipitation in Mentougou reached 538.1 mm,and the maximum precipitation reached 1 053 mm.This heavy rainfall has triggered multiple geological disasters,causing serious damages on production and daily life in Mentougou District.A total of 666 geological disasters(mainly small-scale)took place including 592 collapses,55 mud-slides,10 landslides,and 9 ground collapses.A roughly equivalent amount of rock collapses and soil collapses happened among the landslide disasters,with sliding as the main type of damage.Landslide disasters are mainly soil landslides,and the types of damage are all shallow traction landslides.The debris flow disaster is dominated by rare debris flow,and the damage type belongs to rain-storm debris flow.Ground subsidence is caused by historical mining,mainly manifested as deformation and rupture of subsidence pits,ground fissures,etc.Based on the geological environment background and causes of the existing disaster situation,and taking into account the geological disaster risk levels,surrounding geological environmental conditions,and feasibility of engineering governance,we have proposed prevention and control suggestions such as"emergency response,group measurement and preven-tion,relocation avoidance,and engineering governance".
heavy rainfall of"23·7"geological hazard characteristicsdisaster prevention and control
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