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Accueil du site → Doctorat → Espagne → 2020 → Integración de imágenes de sensores remotos en el desarrollo de indicadores medioambientales en cuencas mediterráneas. Aplicación al seguimiento de su estado hídrico y productividad

Universidad de Córdoba (2020)

Integración de imágenes de sensores remotos en el desarrollo de indicadores medioambientales en cuencas mediterráneas. Aplicación al seguimiento de su estado hídrico y productividad

Gómez Giráldez, Pedro Jesús

Titre : Integración de imágenes de sensores remotos en el desarrollo de indicadores medioambientales en cuencas mediterráneas. Aplicación al seguimiento de su estado hídrico y productividad

Integration of remote sensing images in the development of environmental indicators in Mediterranean basins. Application for monitoring water status and productivity

Auteur : Gómez Giráldez, Pedro Jesús

Université de soutenance : Universidad de Córdoba

Grade : Tesis Doctoral 2020

Résumé partiel
In the Mediterranean basins, the climate is characterized by very hot summers in which rainfall is not usually produced, which generates a strong and periodic water stress in its vegetation cover. The intensity of this water stress is related to the hydrological regime of the previous wet season. In addition, this situation tends to worsen in frequent episodes of drought, causing a decrease in the productivity of these ecosystems. There is currently a large amount of data available, free of charge and on a global scale, with great potential for monitoring the processes associated with water and energy balances in these types of basins. This thesis proposes the use of remote sensing images of different spatial, spectral and temporal resolutions that, combined with specific records from meteorological stations, can be used to generate indicators of different ecosystem variables related to productivity and water status in different unique systems of the Mediterranean area. Specifically, the development of three indicators closely linked to each other is proposed : an indicator of the water status of the soil at the end of the dry season from the state of different vegetation covers ; an indicator of the productivity of natural pastures, the main food support for extensive livestock, based on their status and the climatic conditions of the period evaluated ; and, finally, an indicator of the relationship bewteen water state of the soil and the natural pasture phenological state. The selected study areas are, for the first indicator, the Guadalfeo river basin (Granada), characterized by presenting a gradient of altitude from sea level to more than 3000 m.a.s.l. only 50 km away from the coast, which determines a great spatial heterogeneity in terms of meteorology, hydrology, types and land soil, etc. In this context, the indirect estimation of the state of antecedent moisture from the information obtained from existing covers in the area may be an optimal solution in hydrological studies at basin scale. Regarding the second and third indicators, the study area is the dehesa ecosystems of Andalusia, since the monitoring of pasture production would provide key information to owners and managers to regulate their use and contribute to their conservation, without an excessive increase in costs.

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Page publiée le 24 janvier 2021, mise à jour le 21 juin 2021