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Calderón Burgos, José Manuel and Ruiz Murillo, Keiner José and Toro Valencia, Vladimir Giovanni. (2019). Analysis of the natural modes of oscillation of Cartagena Bay (Colombia). Boletín Científico CIOH (38). pp. 31-41. doi https://doi.org/10.26640/22159045.2019.515

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Abstract

Natural bays, like port enclosures, present oscillation modes due to forcing by incident waves. Cartagena is one of the natural bays of the Colombian Caribbean. It is important for its port development, with particular environmental and physical characteristics since the Bay has the El Dique Canal delta inside and two communications with the Caribbean Sea. The Bay entrances, with which it communicates with the Caribbean, allow that some physical phenomena from the ocean modulate it’s physical processes. One of those physical processes that occur naturally in bays and ports with negative implications are seiches. Seiches are the product of two long waves traveling in opposite directions, and which, due to their oscillatory motion, overlap positively at some places causing abrupt changes in sea level. Attending to the importance of this phenomenon within natural bays and its possible repercussions on Inland ports, this work determined and analyzed the natural modes of oscillation of Cartagena Bay. Using the Merian theoretical model (Wilson, 1972), the first 11 modes of oscillation were found between 0.04 to 0.81 hours. Numerical simulations were carried out with this information using H2D (GIOC, 2001) and WAPO (Silva, 2010) models. Twelve cases were proposed with the first 4 oscillation modes, amplitudes of 0.5, 1 and 1.5 meters, and wave height of 1.2 and 3 meters. Seven points were identified within the bay, where significant sea level variations were observed. This analysis revealed the presence of seiches at points 1, 2, 3, 4, 5, 7 and wave reflection for point 6. On the other hand, despite the numerical advantages of the WAPO with respect to the H2D model, this seems not suitable for long-wave propagation. An analysis of the tide as a forcing agent by means of the Fourier transform technique suggests that the astronomical tide is not a mechanism that generates seiches within the bay of Cartagena.

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Item Type:	Article
Uncontrolled Keywords:	Modos propios de oscilación marea. Transformada de Fourier. Modelos numéricos.
Geographical coverage :	Colombia. Caribe. Bahía de Cartagena
Depositing User:	Dirección General Marítima
ISSN:	2215-9045
Official URL:	https://ojs.dimar.mil.co/index.php/CIOH/article/vi...
Identification Number:	https://doi.org/10.26640/22159045.2019.515

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