Tesis doctoral de Desire Gamez Torrent
Most coastal aquifers undergo seawater intrusion. Mitigating this risk depends on a sound knowledge of flow mechanisms, well located and constructed wells, an effective management, suitable policies and the desire to conserve the aquifer. To this end, a comprehensive geological model is essential. The single most important question that the geological model should address is the degree and nature of the connection of the aquifer to the sea. Differences in the connection explain why apparently similar coastal aquifers display very different salinitzation behavior. Some aquifers salinize with moderate pumping (eg. Tordera and llobregat deltas) whereas others sustain large extractions with lower vulnerability to seawater intrusion (eg. Ter delta). However, the characterization of such a connection is not easy given the lack of onshore-offshore geological mapping potential pathways for seawater contamination. this thesis is focused on sequence stratigraphy, which is necessary to understand the onshore-offshore aquifer connection, thus modifying the classical hydrogeological conceptual models. The methodology of sequence stratigraphy offers a perspective of delta architecture based on geological controls and processes. Sequence stratigraphic concepts are used in western mediterranean deltas in addition to local factors, such as subsidence, uplift and the rate of sediment supply to account for differences in pleistocene stratigraphic patterns and aquifer preservation. These local factors exert an influence over the shape, slope and thickness of aquifers. Together with the width of the continental shelf, the presence of submarine canyons, faults and thin prodelta layers conditions vulnerability to seawater intrusion. the quaternary mediterranean shelf is characterized by high-frequency depositional sequences mainly composed of large-scale regressive wedges with poor or poorly preserved transgressive to highstand intervals. Although the llobregat delta is an anomaly, it
Datos académicos de la tesis doctoral «Sequence stratigraphy as a tool for water resources management in alluvial coastal aquifers: application to the llobregat delta (barcelona, spain)«
- Título de la tesis: Sequence stratigraphy as a tool for water resources management in alluvial coastal aquifers: application to the llobregat delta (barcelona, spain)
- Autor: Desire Gamez Torrent
- Universidad: Politécnica de catalunya
- Fecha de lectura de la tesis: 20/12/2007
Dirección y tribunal
- Director de la tesis
- J.antonio Simo Marfa
- Tribunal
- Presidente del tribunal: María no Marzo Carpio
- Bernard Gensous (vocal)
- Javier Lobo Francisco (vocal)
- Ramón Juliá Brugués (vocal)