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金沙江白格堰塞泄流槽开始过流 四川西藏转移3.42万人

2018-11-12 14:01:02    央广网

  

金沙江白格堰塞泄流槽开始过流 四川西藏转移3.42万人

  金沙江白格堰塞湖开始过流(央广网发 甘孜州新闻办供图)

央广网甘孜11月12日消息(记者刘涛)记者从应急管理部获悉,今天10时50分,金沙江白格堰塞湖通过人工开挖泄流槽开始过流。

今天4时45分,堰塞湖水位到达泄流槽底坎。12日10时,堰塞湖水位高于泄流槽底坎0.67米。堰塞湖蓄水量约5.24亿立方米,上下游邻近水文站水位、流量最近1小时尚无明显变化。现场专家估算,湖水冲刷泄流槽形成较大缺口约需要20小时,届时将形成较大规模泄流。

12日4时,国家防总启动防汛三级应急响应,要求四川、西藏、云南等地和长江防汛抗旱总指挥部强化沿岸风险监测研判,加强应急值守和会商分析,依据实际情况及时启动相应级别应急响应,采取有效措施,确保人民群众生命安全,最大程度减少灾害损失。

据了解,金沙江白格堰塞湖人工泄流槽顶宽42米,底宽3米,最大开挖深度15米,总长度220米,累计修筑施工便道2.5公里,开挖和翻渣累计土石方工程量13.5万立方米。

昨天11时开始,现场应急抢险人员分两批次撤离,第一批22人于昨天13时到达波罗乡,第二批44人于16时从坝体撤离,其余监测人员和机械设备已转移至安全地带。

四川、西藏两省(区)已经转移安置群众3.42万人,受泄洪影响区域已经开始实行交通管制,堰塞湖下游在建和已投用电站已经提前采取腾库和工程措施,做好应对洪峰准备。

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