The harm from flooding goes beyond waterlogged roads and ruined crops. Against the long-term climatic backdrop of the rain belt shifting northward, structural industrial risks hidden for decades deserve even greater vigilance. Recently in Beijing, Science Bulletin and the Institute of Atmospheric Physics of the Chinese Academy of Sciences co-hosted a special lecture on short-duration extreme rainfall, flash floods and urban waterlogging, with leading experts in climate and disaster science delivering keynote reports. At the event, Liu Baoyin, an associate researcher at the academy's Institutes of Science and Development, systematically dissected the three layers of flood damage and proposed a cross-industry, long-term resilience governance framework addressing risk points in agriculture, cities and energy.
The impacts of flood disasters fall into three layers: acute direct shocks, indirect shocks along industrial chains, and chronic structural change. Acute direct shocks include the short-term visible destruction caused by rainstorms and floods - large-scale waterlogging and crop failure, floodwater pouring into underground urban spaces, and power, oil and gas facilities damaged by immersion. Indirect industrial-chain shocks mean that flooding in a single region spreads along supply chains: when one production node is paralyzed, industries in multiple upstream and downstream provinces suffer in sync - losses that are hard to tally and easily underestimated. Chronic structural change is characterized by time lag, spatial invisibility and irreversibility. These effects do not appear immediately but accumulate slowly over years or decades, mostly underground or inside resource systems where routine inspections can hardly detect them. Climate change forces industries to permanently alter production and planning logic, and the original patterns cannot be restored.
Agriculture faces the risk of permanent shifts in planting structure. Under acute shock, short-duration torrential rain soaks crops, causing reduced yields or total loss in the same year. On the chronic side, as the rain belt moves north and the timing of the rainy season keeps changing, the traditional farming experience built on the 24 solar terms fails, forcing farmers to switch varieties and adjust sowing dates. Once a path dependence in planting forms, it is very hard to return to the original farming pattern. Typical examples include the harvest-season rains that rot wheat in Henan and the persistent autumn drizzle during harvest in Shandong: years of misplaced rainfall have pushed farmers to adjust planting on their own, but without scientific zoning guidance the cost of trial and error is extremely high. Agriculture's core weaknesses include a national agro-climatic zoning map that has not been updated in over forty years, meteorological warnings that report rainfall only without converting it into crop-specific risk alerts, and low standards for flood-defense facilities such as field drainage and grain drying.
Cities face the problem of rising groundwater eroding underground infrastructure. Under acute shock, short-duration extreme rainfall exceeds the capacity of drainage networks, water pours back into tunnels and basements, and traffic and daily life grind to a halt. On the chronic side, persistently increasing rainfall gradually raises urban groundwater levels, continuously eroding basements, metro systems and underground utility corridors, triggering ground subsidence and fissures - and the original design standards of underground flood defenses become obsolete, with hazards lying dormant for a decade or more before erupting together. The city sector's core weaknesses are that underground-space waterproofing and urban drainage systems were designed on historical low-rainfall data without incorporating long-term groundwater rise trends, and there is no standing mechanism for assessing underground structural safety.
