Aplicación del software modflow y sistemas de flujo de Töth, como soporte al modelo hidrogeológico conceptual de la secretaria de ambiente, en el bloque centro de Bogotá

Abstract

This research proposal gives continuity to the collaborative work began by the Universidad Santo Tomas (USTA) and the Universidad de La Salle (ULS), within the framework of the interinstitutional agreement signed between the parties, as a support to the conceptual hydrogeological model carried out by the Environment Authority in the city of Bogotá (SDA). Understanding the dimension of the project, the area of interest was limited to 3 blocks, the northern block (already evaluated), the central block (object of this document/study), and the southern block (has not been evaluated).

Maintaining the methodological scheme of the previous study, the ModelMuse tools were used along with the Conceptual Model of Töth to relate the parameters of hydrogeological assessment and thus be able to configure a scenario of the behavior and dynamics of the underground flows in the city of Bogotá. The main source of the investigation is the hydrogeological conceptual model for the aquifers of Bogotá made by the SDA in 2012, that has as an objective the planning and determination of technical criteria of water management in the normative framework of the concession of groundwater in the capital city.

During the research, the main cartography was generated for the mapping of the flow types in the interest area, which postulates the existence of local flow systems over the Eastern geological formation and regional types of flow systems over the Western area of the city of Bogota. Likewise, with this baseline as a reference, the hydrological numerical model was constructed, obtaining Root Mean Squared Errors between 9.03 meters and 9.33 meters, including calibration and validation. These values indicate the obtainment of an accurate and quite close to reality numerical model.

After carrying out the parametric correlation proposed in the methodology, the Eastern mountains are defined as an important recharge zone within the hydrogeological system, with an approximate area of 7000 hectares. On the other hand, a sector with very high discharge potential is defined, superior to 8000 hectares, which is located over the Central-Western sector of the study area.