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Estudio gravimétrico en la "Catedral Vieja" de Cádiz mediante algoritmo genético

Otros títulosGravity study in the "Old Cathedral" of Cádiz by means of genetic algorithm
AutorGonzález Montesinos, Fuensanta; Vieira, Ricardo ; Camacho, Antonio G.
Palabras claveGeodesia
Genetic algortithm
Fecha de publicación2003
EditorUniversidad Politécnica de Valencia
Citación3ª Asamblea Hispano-Portuguesa de Geodesia y Geofísica: proceedings. Valencia : UPV, 2003, p. 1783-1788.
ResumenThe gravity method is often a tool very useful of archaeological works because it is a not aggressive technique, with easy observation process and relatively cheap. Among the several archaeological studies, the search of cavities, as caves or crypts, is perhaps the best application for gravity surveys. This is the case of the Old Cathedral in Cadiz, where several researchers supposed the existence of a large central crypt under the main nave. We present here this study where we apply a new method of 3D gravity inversion based in genetic algorithms (GA) which are search techniques according to the Darwin 's principle about evolution of individuals into a population. We propose the inversion problem like an evolution process where the individuals are the possible models which represent the sources of the observed gravity anomaly field. The problem consists in determining the geometry of these anomalous bodies corresponding to prescribed mass density contrasts distributing them in afixed discrete 3- D partition of prisms which divides the subsurface volume close to the survey. To reduce the risk of getting trapped in local minima, the GA searches the optimum solution modifying a population of models by means of successive iterations. Several operators act altering the population while a process of selection ensures that the most successful individuals are selected and allowed to evolve, looking for minimizing the established error function. The efficiency of this method has been showed with fictitious examples and several real applications. In the case of the Old Cathedral of Cádiz, several important subsurface structures are identified by means of this gravity inversion process. None of them corresponds to a large central crypt stated below the church but, nevertheless, several cavities are located under several chapels. Moreover, outside ofthe church, other structures with negative density contrast are located where the existence of one well is supposed. The structures with positive density contrasts, also outside of the church, are associated with structures with high density as walls. After this gravity study, several excavation works have confirmed some of these results.
DescripciónComunicación presntada a la 3ª Asamblea Hispano-Portuguesa de Geodesia y Geofísica = 3ª Assembleia Luso-Espanhola de Geodesia e Geofisica, celebrada en Valencia entre el 4 y el 8 de febrero de 2002.
ISBN84-9705-297-8 (o.c.)
84-9705-364-8 (v. 3)
Aparece en las colecciones: (IAG) Comunicaciones congresos
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