【摘要】：本文根據(jù)2007年黃河調(diào)水調(diào)沙期間黃河三角洲及其毗鄰海域的水文、泥沙調(diào)查數(shù)據(jù)資料,使用Mike 3三維水沙數(shù)值模型模擬了黃河調(diào)水調(diào)沙全過程(低流量、高流量、高含沙量)入海水沙輸運(yùn)過程,揭示了人造洪峰下水沙擴(kuò)散范圍和特征,分析了泥沙入海后的沉積動(dòng)力學(xué)機(jī)制。研究發(fā)現(xiàn):入海淡水和表層細(xì)顆粒泥沙主要以異輕羽狀流形式向外海和河口兩側(cè)沿岸擴(kuò)散,中、底層粗顆粒泥沙向外海擴(kuò)散非常有限,有少量向河口兩側(cè)沿岸擴(kuò)散,擴(kuò)散范圍小于表層;河口區(qū)在漲-落、落-漲潮流轉(zhuǎn)換時(shí)刻分別存在著潮流切變鋒,切變鋒均形成在淺水區(qū),而后向深水區(qū)移動(dòng),切變鋒的發(fā)生對泥沙向外海擴(kuò)散有著明顯的阻隔作用。
[Abstract]:Based on the hydrological and sediment survey data of the Yellow River Delta and its adjacent waters during the Yellow River water and sediment transfer period in 2007, the whole process (low discharge, high discharge) of the Yellow River water and sediment transfer is simulated by using the Mike 3 three-dimensional water and sediment numerical model. The transport process of high sediment content into seawater reveals the range and characteristics of sediment diffusion by artificial Hong Feng, and analyses the sedimentary dynamic mechanism of sediment after it enters the sea. It is found that the fresh water and surface fine granular sediment in the sea mainly diffused to the offshore and both sides of the estuary in the form of hetero-plume flow, and the coarse sediment in the bottom layer diffuses to the outer sea very limited, and a small amount of sediment diffuses to the banks of both sides of the estuary. The diffusion range is smaller than that of the surface layer, the tidal shear front is formed in shallow water and then moves to deep water in the estuary area at the transition time of rising-falling and falling-rising tidal current, and the shear front is formed in the shallow water area, and then moves to the deep water area. The occurrence of shear front has an obvious barrier effect on sediment diffusion to the sea.
【作者單位】： 中國海洋大學(xué)海底科學(xué)與探測技術(shù)教育部重點(diǎn)實(shí)驗(yàn)室;中國氣象科學(xué)研究院災(zāi)害天氣國家重點(diǎn)實(shí)驗(yàn)室;
【基金】：國家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃項(xiàng)目(2010CB951202)資助~~
【分類號(hào)】：TV148

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