Sea-level variability from 1950 to 2000 and hazards linked to storm surge episodes in Bocagrande and Castillogrande peninsulas, Cartagena de Indias, Colombia
DOI:
https://doi.org/10.26640/22159045.186Keywords:
Meteorological tide, storm surges, mar de leva, floods, digital elevation model, Cartagena de IndiasAbstract
The risk of flood in Bocagrande and Castillogrande, two peninsulas of the city of Cartagena de Indias (southwest Caribbean Sea) were studied in several stages. A sea-level time series registered by a tide-gage inside the Bay of Cartagena was analyzed extracting the 'meteorological tide' based on the differences between the observed levels and the astronomical tide. These residuals were then analyzed looking for correlations with meteorological data at local, regional and basin-wide levels. This analysis permitted the characterization of the sea-level rise caused by storms in this part of the Colombian coast, giving explanation to the floods occurred between 1950 and 2000 caused by this storm surges called locally “mares de leva”. These recurrent events formed by the combination of the wind set-up and waves 'set-up' and 'run-up' produce floods of variable amplitude in the streets of Bocagrande and Castillogrande. A high- resolution digital terrain model constructed with a LIDAR data base (+/- 20 cm precision) served as topographic base for the construction of several scenarios related to the sea-level rise caused by storm surges and to the climatic sea-level rise for the 21st century. These scenarios showed the extreme vulnerability of Cartagena, particularly in Bocagrande and Castillogrande peninsulas and the necessity of intervention in the short-term taken into account its social and economic importance for Colombia.Downloads
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