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堰塞湖潰堤蓄水量大減 少6800萬噸空拍畫面曝
發布時間：2025/09/24 17:08:47
更新時間：2025/09/24 21:02:18
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圖、文／周刊王
樺加沙颱風外圍環流帶來驚人雨勢，花蓮馬太鞍溪堰塞湖23日發生溢流，滾滾洪水重創光復鄉。農業部林業及自然保育署今日清晨派出無人機勘查，影像顯示壩頂已被水流切削約80公尺，蓄水量大幅縮減至2300萬噸，僅剩高峰期的四分之一，但當局仍維持紅色警戒。
樺加沙颱風外圍環流帶來驚人雨勢，花蓮馬太鞍溪堰塞湖23日發生溢流，滾滾洪水重創光復鄉。農業部林業及自然保育署今日清晨派出無人機勘查，影像顯示壩頂已被水流切削約80公尺，蓄水量大幅縮減至2300萬噸，僅剩高峰期的四分之一，但當局仍維持紅色警戒。
林保署表示，昨日堰塞湖蓄水量一度高達9100萬噸，經過連夜排洩，目前水量減少75％，情勢雖略為趨緩，但山區持續降雨，恐有土砂流入及積淹水風險。當局呼籲居民切勿靠近河道，並配合政府避難指令。
林保署強調，搶災人員在進行搶險作業時仍須注意安全，未來將依湖體蓄水量、壩體穩定度與下游沖刷情形，重新研擬防災警戒機制，並審慎決定何時解除警戒。
馬太鞍溪堰塞湖溢流已造成15人死亡，並傳出疑似再度溢流。對此，林業署花蓮分署回應，雖因降雨導致集水區持續沖刷壩體，部分水量外洩，但現場觀測與空拍結果均顯示，並未出現新的壩體崩塌，也沒有形成第三波洪峰，相關單位仍將持續密切監測。
