長源電力(000966.SZ):所屬鄂坪水電站發生泄洪險情 3台機組保持正常發電狀態
格隆匯9月6日丨長源電力(000966.SZ)公佈,近日,相關媒體報道了因持續強降雨,公司所屬鄂坪水電站在泄洪過程中出現溢洪道泄槽段末端局部垮塌險情的有關新聞。
鄂坪水電站為公司全資子公司國電湖北電力有限公司內部核算電廠,位於湖北省十堰市竹溪縣鄂坪鄉,控制流域面積1676平方公里,總庫容3.027億立方米,調節庫容1.53億立方米,屬年調節水庫。水庫正常蓄水位550米,死水位520米,設計洪水位(P=1%)550.56米,校核洪水位(P=0.02%)554.65米。電站總裝機容量為11.4萬千瓦(3×3.8萬千瓦),設計年利用小時2408小時,年發電量2.74億千瓦時。2020年,鄂坪水電站全年發電3.45億千瓦時,經審計總資產82,956.15萬元、營業收入1.116億元、淨利潤6119.06萬元。
2021年8月25日至8月30日,鄂坪水電站水庫流域遭遇兩輪強度大、時間長、範圍廣的強降雨,過程雨量達195.80毫米。8月26至30日,鄂坪水電站按規定程序持續開展水庫泄洪,最大洪峯流量2958立方米/秒(20年一遇洪水標準2900立方米/秒),最大泄洪量2450立方米/秒,洪水削峯率17%。因長時間、高強度的泄洪導致溢洪道泄槽段末端至挑流鼻坎段形成較大沖坑、溢洪道右岸山體局部垮塌。
在地方政府及相關單位的大力支持下,鄂坪水電站於9月5日18:00已完成了溢洪道衝坑臨時澆築回填工程,搶險工作已基本結束。9月5日20:30經防汛部門批覆,正式開閘泄洪,9月6日14:00,下泄流量400立方米/秒,未見明顯異常。搶險期間,大壩變形、位移等監測未見異常。近期鄂坪水電站庫區及上游無強降雨,庫水位還將持續下降,電站大壩運行安全總體可控。
此次險情未對鄂坪水電站發電造成較大影響,3台機組保持正常發電狀態。為確保大壩安全,在溢洪道修復前,將降低水位運行。
此次應急搶險,竹溪縣政府共轉移4個鄉鎮15個村的羣眾1555户5456人,未造成人員傷亡。
此次險情處置已發生的臨時澆築回填工程費用預計為1000萬元左右。後期,公司將組織專業人員進行水工建築物全面檢查,並委託專業設計院開展勘測設計,擬定溢洪道修復方案,經水利部門、能源局等部門批准後實施。
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