内波单独作用形成的深水沉积物波

doi:10.7605/gdlxb.2002.01.009

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Abstract

Deep-water sediment waves are wavy depositional bodies of large-scale, which are well developed on the seafloor. They have been universally interpreted as contour-current deposits or turbidity–current deposits. Incorporated with the new development of the theory of internal waves, the generation mechanism of deep-water sediment waves by internal waves has been studied on the basis of the hydrodynamics of internal-wave deposition. Several conditions have been generalized as follows: 1）Using submarine flows only to interpret the origin of sediment waves can’t meet the require of velocity and thickness of flow sediments to form large sediment waves. 2) Internal waves can induce bottom currents and form depositional bedforms of larger scale than those formed by surface waves. 3) Internal waves can build sediment waves of large scale. The origin of sinusoidal, asymmetric and climbing wavy units of sediment waves can be reasonably interpreted by internal waves alone. The sediment waves of sinusoidal wavy shape can be formed either by the progressive internal waves propagating along the interface which is relatively high above the seafloor or by standing internal waves. Sediment waves of asymmetric wavy shape can be formed either by the progressive internal waves propagating along the interfaces near the seafloor or internal solitary waves. When the internal wave-induced bottom currents increase further, the sediment waves of climbing wavy shape should be formed. 4) The progressive internal waves can build large sediment waves that migrate in the opposite direction of the propagating direction of the internal waves. The progressive internal waves propagating toward the deep-sea basins can build large sediment waves with the up-slope migrating direction. This is the reason why sediment waves well developed on the seafloor migrate mainly up-slope.

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Published: 01 February 2002

About author: Zhang Xingyang, born in 1973, graduated from Jianghan Petroleum Institute in 1999, and received Master degree. Now he is a candidate for Ph. D. at the Institute of Petroleum Exploration and Development, and is engaged in reservoir sedimentology and marine geology

Cite this article:

. DEEP-WATER SEDIMENT WAVES FORMED BY INTERNAL WAVES[J]. JOURNAL OF PALAEOGEOGRAPHY, 2002, 4(1): 83-89.

. DEEP-WATER SEDIMENT WAVES FORMED BY INTERNAL WAVES[J]. JOPC, 2002, 4(1): 83-89.

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http://journal09.magtechjournal.com/gdlxb/EN/10.7605/gdlxb.2002.01.009 OR http://journal09.magtechjournal.com/gdlxb/EN/Y2002/V4/I1/83

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