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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Managing deltas : Recent human-induced coastal changes in the guadalfeo river deltaic system (southern spain)
Recent human-induced coastal changes in the guadalfeo river deltaic system (southern spain)
Author : RAFAEL J. BERGILLOS(1), CRISTÓBAL RODRÍGUEZ-DELGADO(1), ALEJANDRO LÓPEZ-RUIZ(1), AGUSTÍN MILLARES(1), MIGUEL ORTEGA-SÁNCHEZ(1) & MIGUEL A. LOSADA(1)
ABSTRACT
Deltas are located at the transition between terrestrial and aquatic environments, consequently, they respond rapidly to
both natural and human-induced disturbances. Mediterranean deltaic systems are particularly sensitive to changes in the
coastline and in the sea level. This work addresses the evolution of the Guadalfeo Delta during the last fifteen years,
focusing on the impact of the construction of Rules’ reservoir in the coastal system. To this end, topographic,
bathymetric and grain size measurements were analyzed and correlated with the fluvial and maritime forcing agents. In
addition, we estimated the volume of sediment transported as bedload and accumulated in the delta for two different
scenarios: real scenario, based on the flows drained by Rules’ dam; and natural scenario, considering the flow upstream
of the reservoir. Coastline and beach profile evolution were also analyzed. The results indicate that the delta dynamics is
dominated by fluvial sediment supply during storm events, which are transported alongshore by the prevailing waves.
We also found a similarity between the granulometric characteristics of the sediment transported as bedload and the
coastal sediment. The damming of the natural river channel close to its mouth has considerably reduced the pulses of
sediment towards the coast. These sediments have accumulated as delta deposits in the reservoir upstream, whereas
the delta has lost sediments and receded.
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Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Managing deltas
Date Published : 20/08/2015
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