The Gener ationa lM echanism of Orientating Sedimentary Structure by In terna l2 waves
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摘要: 深海大型沉积物波的发现,引起了国内外内波成因理论的兴起和发展。研究认为,内波作用于海底时可对海底沉积物进行改造,形成指向沉积构造,这种指向沉积构造可为单向、双向或多向,而其中与内波传播方向相反的反向沉积构造可能是内波沉积所特有的。对于这种反向沉积构造的形成,以LaFond的理论为代表,认为内波引起的底流水平流速反比于密度界面距海底的高度,波谷接近海底,因而可形成反向沉积构造。经研究分析,发现内波与表面波在本质上具有一定的相似性,因而认为用一般意义上的波动理论来解释内波沉积中指向沉积构造的形成机理更加易于理解。明确指向沉积构造的形成机理对于内波沉积的识别具有重要意义。Abstract: The discovery of the large sedimentary-waves in deep water, caused the generations and the developments of internal-waves both home and abroad. The study shows that internal-waves can shape the sediments on seafloor and form orientating sedimentary structure. This kind of structure includes single-direction, double-directions and multi-directions. Maybe the returning structure is the special character of internal-waves. LaFond s' theory about the gener- ation of this kind of structure is widely accepted. The theory indicates that the velocity of bottom currents formed by internal-waves is reverse ratio to the distance between the density interface and the seabed. Return ing transport is the main trends of internal-waves because the trough ofwave is close to the seafloor. The research conc ludes that in ternal-waves are similar homology of surface-waves and the genera tion of the orientating sedimentary structure formed by internal-wave can be exp lained clearly by the general fluctuation theory successfully. The generationmechanism of orientating sed imentary structure is very important to the recognition of the internal- waves sediments
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Key words:
- internal-waves /
- orientating sedimentary structure /
- surface-waves
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