Abstract

VELEZ-CASTANO, José Daniel  and  GOMEZ-GIRALDO, Andrés. Multilayer models to estimate periods of natural oscillation modes in tropical lakes and reservoirs. Tecnol. cienc. agua [online]. 2013, vol.4, n.2, pp.171-183. ISSN 2007-2422.

Internal waves are essential to energy transfer processes in stratified water bodies. To understand their effects and implications for the energy balance of a water body, it is necessary to know its spatial structure and period. In tropical zones, the thermal stratification in the water column is not as strong as in zones with climatic seasons. In the latter zones, the stratification can be described with models having few layers because the epilimnion and hypolimnion are easily distinguishable, while in tropical zones significant temperature gradients are observed through most of the water column, so describing the stratification with few layers can lead to unreliable estimates. In this paper, a multilayer model is developed to calculate periods of natural oscillation modes in lakes and reservoirs with stratification typical of tropical zones. The stratification is simplified by assuming uniform density layers and the water body is considered to have a horizontal flat bottom. The model solves the eigenvalues and eigenvectors problem corresponding to sets of celebrities and the spatial structures of natural modes of oscillation. It is shown that a three-layer model is inadequate to estimate the celebrities of the natural modes of oscillation of the Porce II tropical reservoir.

Keywords : multilayer model; tropical lakes and reservoirs; internal waves; physical limnology.

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