STABILITY OF THE NEW ALLUVIAL FAN OF EL PARTIDO STREAM, LOCATED IN THE EASTERN SIDE OF EL ROCÍO VILLAGE IN THE DOÑANA NATIONAL PARK (SPAIN), AFTER THE ACTIONS CARRIED OUT TO RESTORE ITS HYDROLOGICAL REGIME
Free (open access)
Volume 1 (2011), Issue 4
439 - 462
J.A. MINTEGUI AGUIRRE, J.C. ROBREDO SÁNCHEZ, C. DE GONZALO ARANOA & P. HUELIN RUEDA
We present, first of fall, a recall of the formation of a new alluvial fan at El Partido stream between 1982 and 2006, located in the eastern side of El Rocío village, over the Doñana National Park Marshes, as a result of the channelization of the mentioned stream with crop purposes in 1981. The settlement of the new alluvial fan, over an area of special protection, and the concerns linked to its expansion and growth, hindering the drainage of the urbanized area of El Rocío village after flood events, caused a strong impact. The analysis of the situation drove to the conclusion that the most suitable measure to stabilize the new alluvial fan was to restore the functionality of the former alluvial fan located upstream the study area. The restoration works were executed in 2006 and from the year 2007 the monitoring of its behavior in several flood events that occurred in the stream has been carried out. This paper summarizes the followed restoration scheme of the former alluvial fan and describes the main monitoring tasks, especially during the last 2 years focused specifically in the neighborhood of El Rocío village. To conclude, a description of the recent flood behavior along the final reach of the stream, as a result of the restoring works and its impact on the current stability of the new alluvial fan has been provided.
flood defense, hydrological correction, stabilization of an alluvial fan, torrential event