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                                  黃河為何 20年不再斷流?

                                  河南省人民政府門戶網站 www.5laifa.com 時間:2019-08-13 07:27 來源:河南日報

                                    8月12日,水利部黃河水利委員會宣布,截至當天,黃河實現連續20年無斷流,徹底改變了過去萬里長河斷流頻仍的局面,為世界江河治理與保護、人與自然和諧共生提供了范例。

                                    黃河如何做到20年不斷流?記者為此進行了走訪。

                                    曾一年斷流226天

                                    “黃河之水天上來,奔流到海不復回”。在國人心目中,千萬年來,黃河應該是滔滔不絕,奔流入海。讓人想不到的是,在上世紀這條母親河卻頻繁斷流,就像母親沒有了乳汁。

                                    黃河水利委員會水文局副局長袁東良介紹,從上世紀70年代起,黃河開始出現斷流現象。1972年至1996年,25年間有19年出現河干斷流,平均4年斷流3次。1987年后,更是連年頻繁出現斷流,并且斷流時間提前,范圍不斷擴大。1997年,終于爆發了迄今為止最為嚴重的斷流,當年斷流河道上延至開封附近,占黃河下游河道總長的90%,斷流時間226天,劉家峽、三門峽水庫開閘放水也未能阻止斷流。

                                    “頻繁斷流直接影響沿黃城鄉生產生活,河道萎縮進一步加劇、河流自凈能力降低、生態系統失衡,同時還造成嚴重經濟損失。”袁東良說。

                                    1998年年初,中國科學院、中國工程院163名院士聯名呼吁“行動起來,拯救黃河”。

                                    下游用水增加導致斷流

                                    滔滔萬里黃河,為何會斷流?黃河水利委員會水資源管理與調度局高級工程師周康軍介紹,黃河斷流的主要原因是天然水資源貧乏、人居用水日益增加、缺乏科學管理。

                                    由于氣候原因,上世紀末黃河流域降雨量明顯減少。1919年至1975年,黃河流域多年平均降水量為476毫米,1986年至2000年,降水量降為398毫米,天然徑流量隨之減少,黃河來水不足。

                                    “隨著改革開放,經濟快速發展,黃河流域和下游工農業用水迅速增加,這是造成下游斷流的主要原因。”周康軍說,本來就缺水的黃河,以占全國2%的河川徑流量,養育了全國12%的人口,灌溉了15%的耕地,支撐了全國14%的國內生產總值。

                                    袁東良說,當時小浪底水庫尚未投用,黃河干流上調蓄能力較大的龍羊峽、劉家峽水庫,都位于蘭州以上河段,距離下游3000多公里,下泄水流到下游需要近1個月,遠水難解近渴。再加上,缺乏統一的水資源調度、管理體制,一旦遇到枯水年份,沿河各地通過引水工程爭搶引水,造成下游斷流日趨嚴重。

                                    多措并舉保暢流

                                    “進入新世紀后,黃河流域降水量有所增加,小浪底水利樞紐投入使用,黃河水量統一調度之后,河水開始長流。”周康軍說。

                                    1987年,國務院批準南水北調工程生效前黃河可供水量分配方案,該方案的批復使黃河成為我國大江大河中首個進行全河水量分配的河流。根據國務院授權,黃河水利委員會從1999年3月正式實施黃河水量統一調度,這在我國七大江河流域中首開先河。同年8月12日之后,黃河干流再未出現斷流。

                                    “20年來,小浪底年均庫容達到109億立方米,巨大的庫容,讓汛期大量洪水留在庫中,到冬季枯水期再平穩下泄,保證了下游冬春季節的灌溉用水,也為黃河20年不斷流發揮了關鍵作用。”小浪底水利樞紐管理中心水量調度處處長劉樹君說。

                                    20年來,黃河水利委員會綜合運用行政、法律、工程、科技、經濟等手段,結束了黃河下游頻繁斷流的歷史。比如:黃河水量統一調度實行以省際斷面流量控制為主要內容的行政首長負責制;聯合調度干支流骨干水庫,充分調節水資源時空分布;提升黃河水資源調度與管理系統,為“精細調度”提供強大科技支撐。

                                    河水長流,生機勃勃的黃河形成了一條生態廊道。20年來,黃河三角洲自然保護區濕地明水面積占比由原來的15%增加到現在的60%,自然保護區鳥類增加到368種。久違的洄游魚類重新出現,河口三角洲再現草豐水美、鳥鳴魚躍的動人景象。(記者 高長嶺)

                                  責任編輯:李瑞

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