發(fā)布時(shí)間：2018-04-14 11:28

  本文選題：枯季 + 大潮��； 參考：《華南理工大學(xué)學(xué)報(bào)(自然科學(xué)版)》2017年04期

【摘要】：伶仃洋為一典型的復(fù)合型潮汐河口灣,以潮流動(dòng)力作用為主.伶仃洋枯季鹽淡水混合具有很大的時(shí)空變化特點(diǎn),不能認(rèn)為是單一的緩混合型;另外,航道加深會(huì)影響動(dòng)力及物質(zhì)輸運(yùn).文中在動(dòng)力地貌學(xué)的基礎(chǔ)上,采用機(jī)制分解法和三維數(shù)學(xué)模式研究了航道三期工程前后航道的動(dòng)力變化和鹽淡水混合特征.結(jié)果表明:伶仃航道上、中、下3個(gè)區(qū)段的動(dòng)力特點(diǎn)以及鹽淡水混合機(jī)制不同;工程后陸架水從底層入侵河口比較明顯;漲、落潮流速增大,航道的垂向環(huán)流明顯增強(qiáng);表層的流速增大幅度較底層大;工程后分層系數(shù)和環(huán)流系數(shù)都有所加大,鹽淡水混合作用加強(qiáng).
[Abstract]:Lingdingyang is a typical complex tidal estuary with tidal current dynamics.The mixing of salt and fresh water in the dry season of Lingdingyang is characterized by great temporal and spatial variation, which cannot be considered as a single slow mixing type, in addition, the deepening of waterway will affect the dynamic and material transport.On the basis of dynamic geomorphology, the dynamic changes of waterway and the mixing characteristics of salt and fresh water before and after the third phase of waterway project are studied by mechanism decomposition method and three-dimensional mathematical model.The results show that the dynamic characteristics and the mixing mechanism of salt and fresh water are different in the three sections of Lingding Waterway, and the vertical circulation of the channel is obviously enhanced when the continental shelf water invades the estuary from the bottom layer, the velocity of falling tide increases, and the vertical circulation of the channel increases.The velocity of the surface layer is larger than that of the bottom layer, the stratification coefficient and circulation coefficient are increased, and the mixing of salt and fresh water is strengthened.
【作者單位】： 華南理工大學(xué)土木與交通學(xué)院;
【基金】：國家自然科學(xué)基金資助項(xiàng)目(10902039)~~
【分類號(hào)】：U612

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