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黃河調(diào)水調(diào)沙影響下河口入海泥沙擴(kuò)散及地貌效應(yīng)

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  本文關(guān)鍵詞: 黃河調(diào)水調(diào)沙工程 入海泥沙擴(kuò)散 粒度變化 地貌效應(yīng) 出處:《中國海洋大學(xué)》2014年碩士論文 論文類型:學(xué)位論文


【摘要】:據(jù)2013年7月黃河調(diào)水調(diào)沙期間三船同步四斷面(A、B、C、D)25h水文泥沙連續(xù)觀測的資料,分析了四斷面及各斷面所含站位點的流速、含沙量、溫度及鹽度的分布特征,計算了各連續(xù)站表、中、底三個層位的凈泥沙單寬通量,以此來討論調(diào)水調(diào)沙期間河口入海泥沙擴(kuò)散和沉積的范圍,,并結(jié)合2010年黃河調(diào)水調(diào)沙期間(7月)和黃河調(diào)水調(diào)沙前(5月)、調(diào)水調(diào)沙后(9月)黃河口底質(zhì)沉積物樣品的實測數(shù)據(jù),提取并分析調(diào)水調(diào)沙實施前(1996-2002年)和實施后(2002-2008年)的衛(wèi)星遙感數(shù)據(jù)資料,評價黃河調(diào)水調(diào)沙工程計劃對黃河泥沙及河口地貌效應(yīng)的作用,得到的主要結(jié)論包括: 1)調(diào)水調(diào)沙期間,高溫低鹽的黃河沖淡水離岸擴(kuò)散,擴(kuò)散范圍較大;入海泥沙在向海擴(kuò)散過程中迅速沉積在近岸的河口口門附近,距岸約11km,擴(kuò)散的范圍有限,水沙擴(kuò)散范圍不一致。調(diào)水調(diào)沙期間各站位溫鹽躍層明顯,在淺水區(qū)域水體垂向混合強(qiáng)烈,分布均勻,在深水區(qū)域懸浮泥沙主要集中在躍層以下的水體中傳輸。 2)黃河調(diào)水調(diào)沙期間各站連續(xù)25h的凈泥沙單寬通量分布特征顯示,黃河口沿岸懸浮泥沙主要向東及偏東南方向擴(kuò)散。受徑流影響,河口口門泥沙通量最大可達(dá)85×103g/m/s,但在距離河口10km以外區(qū)域通量銳減,清水溝廢棄河口區(qū)通量位于其次,其他地區(qū)通量普遍較低。 3)2010年調(diào)水調(diào)沙之前,河口附近淤積的泥沙粒徑較粗(以砂和粉砂為主要成分)、分選較好;調(diào)水調(diào)沙期間入海泥沙主要以粗顆粒物質(zhì)為主,沉積速率大;調(diào)水調(diào)沙結(jié)束以后,河口地區(qū)表層沉積物的粒徑變細(xì),黏土含量增加,分選變差,說明調(diào)水調(diào)沙后期入海泥沙粒徑較細(xì),覆蓋在之前沉積的粗顆粒沉積物之上;一段時間后經(jīng)過冬季風(fēng)暴的侵蝕作用,上覆的細(xì)顆粒泥沙通過再懸浮被搬運,之前沉積的粗顆粒泥沙暴露在海底,因不易被搬運而保留。經(jīng)過調(diào)水調(diào)沙工程逐年進(jìn)行,河口處粗顆粒泥沙淤積量增多,對河口造陸的貢獻(xiàn)較大。 4)調(diào)水調(diào)沙實施以前(1996-2002年),河口岸線平均最大淤進(jìn)速率約為1.7km/a,同時廢棄河口河嘴岸線最大平均每年蝕退0.4km,孤東海域在這一期間岸線以蝕退為主,每年約蝕退0.277km,南部萊州灣的西北則呈現(xiàn)略淤積的特點。調(diào)水調(diào)沙實施后,河口岸線大幅淤進(jìn),最大速率約為0.777km/a,該速率雖小于調(diào)水調(diào)沙實施之前的平均速率,但由于河口明顯加寬,總淤進(jìn)面積遠(yuǎn)大于1996年至2002年期間河口的淤進(jìn)面積。河口三角洲蝕積狀態(tài)發(fā)生顯著變化,1996-2002年期間,河口最大淤積厚度量約為4m,且現(xiàn)行水下三角洲葉瓣為凈侵蝕,侵蝕量達(dá)0.39Gt(109t),在2002年以后淤積最大厚度可達(dá)6m,現(xiàn)行水下三角洲葉瓣為凈淤積,淤積約量為0.28Gt。表明調(diào)水調(diào)沙實施以后,河口入海泥沙由于擴(kuò)散范圍有限而沉積在河口附近,使河口岸線向海淤進(jìn)速率顯著增加而水下三角洲部分由凈侵蝕轉(zhuǎn)換為凈淤積,增加了黃河入海泥沙的造陸速率。
[Abstract]:According to the data of the continuous observation of the water and sediment of the four sections ( A , B , C , D ) of the Yellow River during the Yellow River Diversion Project in July 2013 , the distribution characteristics of the flow rate , the sediment content , the temperature and the salinity of the stations included in the four sections and each section are analyzed . 1 ) During the water - adjusting and sand - adjusting period , the high - temperature and low - salt Yellow River is diffused and diffused offshore , and the diffusion range is relatively large ; the sediment in the sea is rapidly deposited near the estuary of the nearshore in the process of centripetal diffusion , the range of the diffusion is limited , and the diffusion range of the water sand is not consistent . During the water - adjusting and sand - adjusting period , the temperature - salt jump layer of each station is obvious , the vertical mixing of the water body in the shallow water area is strong , the distribution is uniform , and the suspended sediment in the deep water area is mainly concentrated in the water body below the jump layer . 2 ) The net sediment single - width flux distribution characteristics of continuous 25h in the Yellow River diversion sediment show that the suspended sediment along the Yellow River Estuary is mainly spread in the east and southeast directions . The sediment flux of the estuary is up to 85 脳 103 g / m / s , but the flux of the river mouth is reduced . The flux of the abandoned river mouth area of the clear water ditch is the second , and the flux of other areas is generally lower . 3 ) Before the water diversion and sediment adjustment in 2010 , the sediment grain size in the vicinity of the river mouth is coarse ( mainly composed of sand and silt ) , the separation is good ; the sediment in the surface layer of the river mouth is mainly dominated by coarse granular material and the sedimentation rate is large during the water - adjusting and sand - adjusting period ; 4 ) Before the implementation of water regulation and sand regulation ( 1996 - 2002 ) , the average maximum deposition rate of the river mouth is about 1.7 km / a . At the same time , the maximum average erosion rate of the river mouth is about 0.7km / a , and the maximum velocity is 0.39Gt ( 109t ) . The maximum velocity is 0.39Gt ( 109t ) . The maximum velocity is 0.39Gt ( 109t ) .

【學(xué)位授予單位】:中國海洋大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2014
【分類號】:P737.1

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