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土石流為什麼會發生?一次說清楚!
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土石流為什麼會發生?一次說清楚!

土石流
應變
2020.12.10

為什麼土石流會發生呢?

原因主要有三個

1.豐富的堆積物:足夠的鬆散土砂提供土石流中所需的固態物質。
2.充足之水分:能夠幫助固態物質流動。
3.足夠的坡度:夠大的斜面坡度讓土石流有流動的動力。

當這三個主要發生原因成立,土石流便可能發生,但「土石流」不等於「土石流災害」,土石流為一種『自然現象』,若因發生土石流時,導致人命傷亡,建築物、橋梁、公共建設毀損,造成生命或財產損失,才可稱為『土石流災害』。

土石流黃色及紅色警戒分別代表什麼意思?

黃色警戒代表當地「預測雨量」大於當地的「土石流警戒基準值」,而紅色警戒則是代表當地地區「實際降雨」大於當地的「土石流警戒基準值」,而水土保持局則會針對該地區的狀況發布警戒。

發布土石流紅色警戒區時,是否一定要強制撤離?

第一線之鄉鎮長可依當地實際的降雨狀況,視情況判斷是否需要疏散,但只要發佈疏散撤離命令,民眾皆須以生命安全為優先,配合政府進行強制疏散撤離喔!

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