土壤饱和为何让洪涝滑坡风险大增
China recently issued its first red alert for rain this year, the highest level in its warning system. Since May, multiple rounds of heavy rainfall have struck large parts of the country, especially in the south. Chongqing, a major city in the southwest, has been hit hard. The continuous downpours have triggered flooding and landslides, forcing people to leave their homes and disrupting travel.
Think of the ground as a sponge: it can only hold so much water. After many days of rain, the soil becomes fully saturated. When more rain comes, the ground cannot absorb it, so water runs off quickly into rivers and streets. This sudden runoff is a main cause of flash floods. On hillsides, saturated soil also becomes heavier and loses its grip, making landslides much more likely.
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