【星島綜合報道】位於亞省麥克默里堡(Fort McMurray)東南方向的北部社區德雷珀（Draper）已發佈疏散警報，原因是克利爾沃特河（Clearwater River）冰層融化，開始漫過河岸。
當地緊急事務官員表示，麥克默里堡附近阿薩巴斯卡河（Athabasca River）上的冰塞 (ice jam，指冰塊在河流中堆積、堵塞的物理現象) 導致克利爾沃特河水位上升，該社區所有居民都應做好隨時撤離的準備。
這個在阿薩巴斯卡河上形成的冰塞長約20公里，一直受到當局密切監測。
@fortmacexclusives Ice Jam Watch Issued For Fort McMurray As River Breakup Conditions Shift. Staff at Haxton Centre have evacuated as a precaution. Footage is of Hangingstone and Clearwater near waterways today April 27th 12pm The province has issued an Ice Jam Watch for the Athabasca River from Pelican Rapids to Fort McMurray, according to Alberta Rivers. Alberta Rivers says ice jam locations and flooding impacts can be unpredictable, and people near affected streams should be cautious of rapidly changing water and ice levels. According to 103.7 Play, officials say an ice jam has formed upstream, just south of the community. Ice is still reportedly intact through town right now, but conditions can change quickly and without warning. There are also reports that staff at the Haxton Centre were asked to leave as a precaution because the current road access is not protected by flood mitigation. RMWB previously noted that work is still planned this season to restore the original Haxton Centre access and rebuild the flood protection berm in that area. Provincial river forecasters are surveying the river from the air today, and RMWB says a more detailed river breakup update is expected later today. This does not mean Fort Mac is flooding right now, but it does mean the risk level has increased and the next updates matter. Follow Exclusives and check our story for more ✅ Sources: Alberta Rivers, RMWB, 103.7 Play
周二最新亞省河流監測的數據，此冰塞已使克利爾沃特河水位上升4.5米，阿薩巴斯卡河水位上升5.5米。
德雷珀是伍德布法羅地區自治市（Regional Municipality of Wood Buffalo）的一個小型鄉村社區，人口137人，位於麥克默里堡東南約12公里處，沿河而建。
公告警告稱，水位可能影響花園巷（Garden Lane）和河灣巷（River Bend Close）的通行。截至周二上午，花園巷的部分路段已被大水沖毀。
(隨着河流水位上漲，一輛拖車和一個貨櫃幾乎完全被淹沒在麥克默里堡市中心。 CBC)
當局建議德雷珀的所有居民準備一個72小時應急包，制定應急計劃，並密切注意當地應急官員發佈的緊急通知。
官員敦促該地區的居民檢查他們的房屋保險單，並告知緊急應變人員是否有需要協助撤離的鄰居。
每年春季河水融化通常會帶來水浸風險，近幾日，隨着克利爾沃特河和阿薩巴斯卡河水位開始上漲，緊急官員一直在密切關注。官員警告，未來幾天冰情可能會在幾乎沒有預警的情況下發生變化，尤其是在氣溫升高的情況下。
麥克默里堡有悠久的水浸歷史，主要原因是阿薩巴斯卡河和克利爾沃特河交匯處的冰塞所致。雖然該地區幾十年來記錄了多次水浸，但2020年4月的水浸被認為是百餘年來最具破壞性的。
那年春天，阿薩巴斯卡河上一條長達25公里的巨大冰塞導致水位急劇上升，洪水淹沒了麥克默里堡市中心，約13,000名居民一度流離失所，市中心地區1,200多棟建築物受損，造成 5 億元的損失。
圖：Facebook/Mike Jones
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