Geomorphological Processes and Human Impacts in River Basins (Proceedings of the International Conference held at Solsona, Catalonia, Spain, May 2004). IAHS Publ. 299, 2005., 117-123.


Monitoring suspended sediment fluxes in the Na Borges basin, Mallorca, Spain

JOAN ESTRANY & CELSO GARCIA

Department of Earth Sciences, Building Beatriu de Pinós, University of the Balearic Islands,
07122 Palma de Mallorca, Spain

joan.estrany@uib.es

Abstract Suspended sediment fluxes have been monitored since October 2002 within the Na Borges basin, a carbonate lowland agricultural basin (327 km2) in the northeast of Mallorca. Over the study period, between October 2002 and March 2004, four flood events were selected and analysed. Mean suspended sediment concentrations ranged from 46.4 mg l-1 to 166.6 mg l-1 with a maximum suspended sediment concentration of 4000 mg l-1. The analysis of the relationship of water discharge and suspended sediment concentration for the four events shows different behaviour in the availability and depletion of the sediment according to the magnitude and extension of each event, and according to the mixing and routing of water from different sources. This study reports for the first time suspended sediment data for the Balearic Islands.

Key words hysteresis; Mallorca; Mediterranean; sediment availability; suspended sediment concentrations; urban floods