TRAGSA detects a reduction of the rainfall and of the flooded surface in the lagoon complex of El Abalario
The Guadalquivir River Basin Authority (CHG) has ordered to carry out a detailed analysis of the evolution and current status of the lagoon complex of the Manto Eólico Litoral de El Abalario, at the Doñana national park, and of its attached vegetation, through remote sensing data and techniques.
This complex is made up by three wetlands, which present a highly seasonal nature and with a high ecological value, which are fed by the rain and underground waters, and which are highly dependent on the environmental conditions and of the piezometric level of the Doñana water table.
The results of the study, carried out by Tragsatec (Grupo TRAGSA), show a reduction in the rainfall and of the flooded surface, as well as a progressive increase in the vegetative activity linked to the natural evolution of a protected ecosystem.
The biggest challenge in this work consisted in automating the management and processing of the more than 600 Landsat images available, (which were made from 1985 to 2015), in a short time span.
Two variables were generated from the data of each of the images selected: One for the extraction of the water surface, and another as pointing to the strength of the vegetation. Setting parameters according to both indicators, in the 30 year-long historical series, and its correlation with the rain data has made possible to obtain the information required about its evolution and trend, and inferring relationships between the different variables.
Experts in remote sensing
Remote sensing is a low-cost technology, and very useful for the Administration when assessing strategies for restoring water masses which present different alteration levels, and in general for providing support to decisions regarding water management.
Tragsatec has a long experience in the use of this technology, with special mention to the technical aid which it provided in 2011 for “Assessing through remote sensing the levels and area flooded in wetlands included within the Guadalquivir River Basin” which was ordered by the Fundación Biodiversidad and by the CHG.
TRAGSA and Grupo SEPI
Grupo TRAGSA belongs to Grupo SEPI, a corporate holding which includes a total of 16 state-owned companies in which it has direct, majority shareholding participations, with a workforce of around 73,000 professionals in 2014; the Spanish state-owned television and radio corporation, Corporación Radiotelevisión Española, which is attached to SEPI, and one public foundation. Equally, SEPI has direct minority shareholdings in a further ten companies, and indirect shareholdings in more than one hundred companies.
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