Aplicación del modelo numérico Mohid para el estudio hidrodinámico y de transporte de la Ciénaga Mallorquín
Torres Marchena, César
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AbstractKnowledge about the coastal systems functions is limited by observations scarcity and researches in the hydrodynamics field. This study shows how numerical models can help to generate knowledge about coastal processes with little local information and at relatively low cost. This research is a step to the comprehension and the hydrodynamic and transport processes understanding that occur in the Mallorquín lagoon. In this work the hydrodynamic and transport processes of Mallorquín lagoon was studied by applying the modeling system MOHID. The MOHID model is a numerical system for three-dimensional aquatic ecosystems modeling, solving the incompressible primitive equations, assuming hydrostatic equilibrium and using the Boussinesq approximation. In this study, the hydrodynamic and transport behavior of Mallorquín lagoon was analyzed for two simulation scenarios, dry and rainy season, through analysis of water currents and transport of salinity, temperature and dissolved oxygen. The system was forced using the meteorological parameters in the study area, the contribution of inland waters and the tide variation using the integrated model of tides FES (finite element solution) called FES2004. For dry scenario it was considered that the system boundaries were closed and for rainy season an open boundary was established, allowing the interaction between Caribbean Sea and Mallorquín lagoon. The study used all data available locally and made available through oceanographic platforms such as the Centre for Oceanographic and Hydrological Research (CIOH) and the Institute of Hydrology, Meteorology and Environmental Studies of Colombia (IDEAM). In the absence of field data, the verification of the model results was supported according to known physical processes hydrosystem. The sea levels registered by CIOH for October 2013, were used for the qualitative evaluation of water levels registered by the 2D hydrodynamic model. These data together with those established by the FES 2004 integrated model, allowed the characterization of the tide main components, since it was established that the tide that occurs in the study area is of mixed type daytime predominance. 7 As a result of the study, for the dry season scenario the most important and influential forcing is the wind. The contributions of continental waters due to his flow are not significant and influential in the water movement inside the Mallorquín lagoon. Into the lagoon, low velocities are presented largely the same, the higher velocities are given in the zone close to the mouth of the "Arroyo León and on the edge of the sand bar that separates the Caribbean Sea of the Mallorquín Lagoon. The transport of salinity, temperature and dissolved oxygen are dominated by diffusive transport because of the low velocities that occur in the lagoon in this simulation scenario. On the rain scenario season is also considered the wind and the contribution of continental waters, the tide as forcing of the lagoon system, it was obtained that the wind is still important for the movement of water bodies in the lagoon, the tide has great influence on the input or "mouth" that connects the lagoon with the sea and the areas close to it, giving the highest velocities in that area of the lagoon. However it is shown that the tide lost influence in the circulation of the lagoon in the rest of it, presenting very low velocities to areas that comprise the center of the lagoon into the adjoining part with communities. The "Arroyo León” for this time of year has a greater contributor flow, so that carries runoff collection along its path because of the winter. Salinity, temperature and DO in the Mallorquín lagoon is dominated by diffusive transport, however the levels of the first subject to the connection or not with the Caribbean Sea, which agree that the tide brings high salinity the body of water.