Articles | Volume 22, issue 3
https://doi.org/10.5194/os-22-1861-2026
https://doi.org/10.5194/os-22-1861-2026
Research article
 | 
18 Jun 2026
Research article |  | 18 Jun 2026

Along-channel variability of Total Exchange Flow in a narrow, well-mixed estuary: influence of the M4 tide

Manuel Díez-Minguito and Hans Burchard

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Cited articles

Biemond, B., de Swart, H. E., and Dijkstra, H. A.: Quantification of salt transports due to exchange flow and tidal flow in estuaries, J. Geophys. Res.-Oceans, 129, e2024JC021294, https://doi.org/10.1029/2024JC021294, 2024. a, b
Blanton, J. O., Lin, G., and Elston, S. A.: Tidal current asymmetry in shallow estuaries and tidal creeks, Cont. Shelf Res., 22, 1731–1743, 2002.  a
Burchard, H., Hetland, R. D., Schulz, E., and Schuttelaars, H. M.: Drivers of residual estuarine circulation in tidally energetic estuaries: Straight and irrotational channels with parabolic cross section, J. Phys. Oceanogr., 41, 548–570, 2011. a
Burchard, H., Bolding, K., Feistel, R., Gräwe, U., Klingbeil, K., MacCready, P., Mohrholz, V., Umlauf, L., and van der Lee, E. M.: The Knudsen theorem and the Total Exchange Flow analysis framework applied to the Baltic Sea, Prog. Oceanogr., 165, 268–286, 2018a. a, b
Burchard, H., Schuttelaars, H. M., and Ralston, D. K.: Sediment trapping in estuaries, Annu. Rev. Mar. Sci., 10, 371–395, 2018b. a
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Short summary
Combining field observations with an analytical tidal scenario, we estimated in the Guadalquivir estuary its Total Exchange Flow (TEF), which has implications for water quality and residence times. The influence of tidal asymmetry on TEF is also explored. Results reveal a spatial variability in TEF and that salinity–current covariance exerts greater control on TEF than tidal asymmetry. The approach is suitable for regional studies evaluating sensitivity to changes in runoff, salinity and tides.
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