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The fate of Guadalquivir River discharges in the coastal strip of the Gulf of Cadiz. A study based on the linking of watershed catchment and hydrodynamic models.

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URI: http://hdl.handle.net/10498/25195

DOI: 10.1016/j.scitotenv.2021.148740

ISSN: 1879-1026

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APC_2021_015.pdf (6.421Mb)
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Author/s
Gómiz Pascual, Juan JesúsAuthority UCA; Bolado Penagos, MarinaAuthority UCA; González, Carlos José; Vázquez López-Escobar, ÁguedaAuthority UCA; Buonocore, CiraAuthority UCA; Romero Cózar, JeanetteAuthority UCA; Pérez Cayeiro, María LuisaAuthority UCA; Izquierdo González, AlfredoAuthority UCA; Álvarez Esteban, ÓscarAuthority UCA; Mañanes Salinas, RafaelAuthority UCA; Bruno Mejías, MiguelAuthority UCA
Date
2021-07
Department
Física Aplicada; Historia, Geografía y Filosofía
Source
Science of the Total Environment 795 (2021) 148740
Abstract
A catchmentmodel for river basins and a hydrodynamicmodelwere combined in order to simulate the spreading of the turbidity plume produced by sediment discharges from the Guadalquivir River basin within the Gulf of Cádiz under different meteorological conditions. The current fields provided by the hydrodynamic model and a transport-diffusion scheme based on tracking virtual particles tracking released at the river mouth have enabled us to simulate turbidity plumes that show great similarity with the plumes observed in satellite images. The most relevant results of the study show that in the absence of winds, the plume tends to spread very slowly, gradually progressing northwards; this is because of the symmetry between the filling and draining flows at the mouth of the Guadalquivir and low intensity of the tidal currents beyond the mouth. In addition, the transport of the plume towards the Strait of Gibraltar requires wind conditions with a northerly, north-westerly or westerly component. Westwards transport, however, requires winds with an easterly, southerly, or south-easterly component. The periods of heaviest rainfall in the Guadalquivir River basin coincide with winds mainly from the west; therefore, the times ofmaximum discharge at the mouth of the river occurwhen there are wind conditions that favour the transport of the matter suspended in the plume, southwards along the coast, towards the Strait of Gibraltar and the Alboran Sea. Linking the watershed catchment and hydrodynamic models has proved its suitability to predict the evolution and reaching of the sediment plumes fromthe Guadalquivir River discharges and the experience encourages the use of that methodology to be applied in a future prediction systemfor the creation and evolution of those sediment plumes.
Subjects
Hydrological and hydrodynamic models; Suspended solid transport; River discharges; Guadalquivir; Gulf of Cadiz; Strait of Gibraltar
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Attribution-NonCommercial-NoDerivatives 4.0 Internacional
This work is under a Creative Commons License Attribution-NonCommercial-NoDerivatives 4.0 Internacional

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