Characteristics of instability of radiation-induced natural convection in shallow littoral waters

Mao, Yadan, Lei, Chengwang, and Patterson, John C. (2010) Characteristics of instability of radiation-induced natural convection in shallow littoral waters. International Journal of Thermal Sciences, 49 (1). pp. 170-181.

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Abstract

Mixing and transport of terrestrially derived solutes and particulates in littoral regions depend heavily on the characteristics of flow instability. The criteria for radiation-induced instability to occur and the scope of the unstable region in near shore waters were revealed in our previously reported scaling analysis. In the present paper, the characteristics of instability of radiation-induced natural convection in shallow littoral regions are considered. Spectral analysis is conducted to reveal the frequency modes and the power of instability at various positions for different Rayleigh numbers. Results indicate that harmonic frequency modes are present at relatively low Rayleigh numbers. Both the power of instability and the prominence of higher frequency modes increase with offshore distance and the Rayleigh number for the considered shallow region. For a given offshore distance, the frequency modes of instability are the same over the local depth, but the prominence of higher frequency modes increases with depth. It is found that the scaling relation for the stable convection region specified in the previous investigation is also applicable to the time-averaged mean flow in the unstable region.

Item ID: 11965
Item Type: Article (Refereed Research - C1)
Keywords: natural convection; instability; spectral analysis; littoral waters; mixing
ISSN: 1290-0729
Date Deposited: 29 Sep 2010 05:48
FoR Codes: 09 ENGINEERING > 0915 Interdisciplinary Engineering > 091501 Computational Fluid Dynamics @ 100%
SEO Codes: 96 ENVIRONMENT > 9609 Land and Water Management > 960903 Coastal and Estuarine Water Management @ 100%
Citation Count from Web of Science Web of Science 6
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