22-27 September 2019
Trade Fairs and Congress Center (FYCMA)
Europe/Madrid timezone

Hydrological changes in representative ponds at Doñana National Park (DNP) southern Spain, from 1994 to 2015

24 Sep 2019, 16:00
1h
Trade Fairs and Congress Center (FYCMA)

Trade Fairs and Congress Center (FYCMA)

Av. de José Ortega y Gasset, 201 29006 Malaga, Spain
Poster Topic 6 - Groundwater, wetlands and natural heritage Poster with refreshments

Speaker

Dr Miguel Rodríguez-Rodríguez (Pablo de Olavide University)

Description

Changes in the flooded surface, groundwater levels and rainfall data have been analysed in eight ponds of DNP from 1994 to 2015. In addition, a Hydrological Function Index (HFI), that relates morphological and climatic variables, was calculated for the ponds and subsequently compared.
Results showed that precipitation was 10% lower during the second half of the study period (2006 - 2015). We used precipitation as a proxy of water inputs to the ponds (via both direct rainfall and groundwater discharge). A consequent and proportional reduction in the average flooded surface (i.e. a reduction of 10% or less) was detected in 3 out of 8 ponds studied. On the rest of the ponds, reductions of the flooded surface ranging from 35% to 97% were measured. The average depth of the water level was also found to be of 4.5% lower in the second period. Finally, HFI exhibited remarkable differences in some of the studied ponds between the two periods. Two factors were found to have a major influence on the reduction of the flooded surface of the ponds: altitude and distance to pumping facilities. The size and the maximum depth of the pond were also relevant to soften the disturbances in the natural hydrological regime.

Primary authors

Dr Miguel Rodríguez-Rodríguez (Pablo de Olavide University) Mrs Carolina Guardiola (Geological Survey of Spain) Mrs Ana Fernández-Ayuso (Pablo de Olavide University) Mr Héctor Aguilera (Geological Survey of Spain) Mr Javier Heredia (Geological Survey of Spain)

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