2009-08-14公視晚間新聞(梅山崩塌成堰塞湖 下游緊急疏散)

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Uploaded by on Aug 13, 2009

"莫拉克颱風走了,大水肆虐後,留給中南部、慘重災情,但危機卻還沒解除,因為南部山區上,因為梅山山崩形成堰塞湖,昨天下游的高雄縣六龜鄉,更緊急疏散民眾,就怕上游堰­塞湖潰堤,會讓低窪地區再度被淹沒。
堰塞湖會形成,是因為山崩造成溪流阻斷,慢慢蓄積成湖泊,堰塞湖之所以令人害怕,是因為它有可能像是九二一地震後的草嶺潭,自己慢慢消失,但也很有可能像這次淹沒小林村的­情形,一下子潰堤令人措手不及,要預測非常困難。
目前國內針對土石流有長期的監測,但對於堰塞湖卻掌握不了,目前除了林務局定期監控台東龍泉溪上的堰塞湖,堰塞湖的權責單位也是多頭馬車。而這次南部災區道路全數中斷,研­究人員也難以進入監測,到底有哪裡還有堰塞湖,沒有人知道,這讓堰塞湖就像不定時炸彈一樣,一旦潰決,恐怕只會讓災區、雪上加霜。
記者林靜梅王威雄台北報導。"

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