Manuel Díez-Minguito, Miguel Ortega-Sánchez, Asunción Baquerizo, Huib E. de Swart, Miguel A. Losada


This paper presents an analysis of turbidity and suspended sediment transport during low river flows in the Guadalquivir river estuary (Spain). The distribution and sources of the suspended particulate matter (SPM) are identified. The analysis of the transport rates allow us to devise a semi-analytical model for transport of SPM in well-mixed estuaries. The model solves the mass balance equation for SPM on a tidally-averaged timescale. The main inputs are the along channel transport rates and the vertical turbulent difusion cofecients at several locations. The model is applied to the Guadalquivir estuary, where a comprehensive monitoring network was installed from 2008 to 2011. Its application to this estuary allows to check how the SPM concentrations in different reaches of the estuary deviate from their equilibrium values. The results indicate that erosion is dominant in the stretches near to the mouth and that the estuary seems to move towards equilibrium during weak tidal forcing conditions.


Guadalquivir Estuary, Suspended Sediment Transport; Estuarine Turbidity Maxima; Box Model; Morphodynamic Equilibrium

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